Anterior Distal Tibial Angle Research Articles

Joint Preservation Surgery Using Supramalleolar Osteotomy Combined with Posterior Tibial Tendon Release and Lateral Ligament Augmentation in Advanced Varus Ankle Arthritis.

Background: Recent studies utilizing weight-bearing computed tomography have identified abnormal internal rotation of the talus in advanced varus ankle arthritis (VAA) with a large talar tilt (TT), influenced by the posterior tibial tendon (PTT). This study aimed to evaluate the clinical and radiographic results of supramalleolar osteotomy (SMO) combined with PTT release and lateral ligament augmentation for VAA with a large TT. Methods: From January 2015 to September 2018, 15 patients with VAA and a large TT (greater than 5°) underwent SMO combined with PTT release. Clinical results, including visual analog scale (VAS) for pain, American Orthopedic Foot and Ankle Society (AOFAS) ankle-hindfoot score, and ankle osteoarthritis scale (AOS), were assessed. Radiographic results were assessed with various parameters, including medial distal tibial angle (MDTA), anterior distal tibial angle (ADTA), talar tilt (TT), talus center migration (TCM), Meary angle, hindfoot alignment angle (HAA), and hindfoot moment arm (HMA) on foot and ankle weight-bearing radiographs. Clinical and radiographic results were evaluated preoperatively and at the last follow-up. Results: VAS, AOFAS ankle-hindfoot score, and AOS improved significantly from 7.5, 54.4, and 72.6 preoperatively to 3.1, 82.5, and 34.5 postoperatively, respectively. All radiographic parameters exhibited significant changes postoperatively, with the exception of the Meary angle, which demonstrated no significant change. Four patients exhibited improvement in radiographic stage postoperatively; however, average radiographic stage did not significantly improve postoperatively in all patients. One patient progressed to end-stage arthritis postoperatively, necessitating additional ankle arthrodesis. Conclusions: In conclusion, lengthening and lateral ligament augmentation combined with bony realignment procedures may be a reasonable option for treating VAA with a large TT greater that 5°.

Effect of non-vascularized fibular harvest on the donor limb: radiological evaluation at a mean follow-up of twelve point eightyears.

The study is aimed at evaluating the long-term (at a minimum follow-up of 10years) impact of non-vascularized fibular harvest on the donor limbs. There were 27 donor limbs (n = 19 children) available for retrospective radiological review. The graft was obtained bilaterally in eight patients. The following parameters were evaluated in the follow-up radiographs: continuity/non-continuity of fibular regenerate, width of the regenerated fibula, distal fibular station, medial proximal tibial angle, posterior proximal tibial angle, lateral distal tibial angle (LDTA), anterior distal tibial angle, and tibia diaphyseal angulation (interphyseal angles). For analysis and comparisons, the donor limbs were compared to the healthy limbs (controls) of the children with unilateral harvest. Additionally, the impact of continuous and non-continuous fibular regeneration was separately analyzed. The mean child's age at the time of fibular harvest was fouryears. The mean follow-up was 12.8years. The fibula was found regenerated in continuity in 22 limbs of 15 children (81.5%). When analyzed as a combined group (both continuous and non-continuous fibular regenerations), all the donor limb radiological parameters matched those of healthy limbs except LDTA (p = 0.04). In the subgroup analysis between non-continuous and continuous fibulae, significant abnormalities were again obvious in LDTA (p = 0.0001). The non-continuous fibulae were significantly lesser in width. All limbs with non-continuous fibular regeneration manifested ankle valgus. The non-vascularized fibula emerged as a relatively safe procedure in the long term with minimal affections of the knee, ankle, or tibial anatomy when longitudinal integrity of fibula was restored. The non-regenerations of the fibula may be prone to developing ankle valgus.

Hexaxial external fixator versus intramedullary nail in treating segmental tibial fractures: a retrospective study

BackgroundIt’s difficult to treat segmental tibial fractures (STFs), which are intricate injuries associated with significant soft tissue damage. The aim of this study was to compare the clinical effect of hexaxial external fixator (HEF) and intramedullary nail (IMN) in treatment of STFs.MethodsA total of 42 patients with STFs were finally recruited between January 2018 and June 2022. There were 25 males and 17 females with age range of 20 to 60 years. All fractures were classified as type 42C2 using the Arbeitsgemeinschaftfür Osteosythese/Orthopaedic Trauma Association (AO/OTA) classification. 22 patients were treated with HEF and 20 patients were treated with IMN. The condition of vascular and neural injuries, time of full weight bearing, bone union time and infection rate were documented and analyzed between the two groups. The mechanical medial proximal tibial angle (mMPTA), mechanical posterior proximal tibial angle (mPPTA), mechanical lateral distal tibial angle (mLDTA), mechanical anterior distal tibial angle (mADTA), hospital for special surgery (HSS) knee joint score, American Orthopaedic Foot and Ankle Society (AOFAS) ankle joint score, range of motion (ROM) of flexion of keen joint and ROM of plantar flexion and dorsal flexion of ankle joint were compared between the two groups at the last clinical visit.ResultsThere were no vascular and neural injuries or other severe complications in both groups. All 22 patients in HEF group underwent closed reduction but 3 patients in IMN group were treated by open reduction. The time of full weight bearing was (11.3 ± 3.2) days in HEF group and (67.8 ± 5.8) days in IMN group(P < 0.05), with bone union time for (6.9 ± 0.8) months and (7.7 ± 1.4) months, respectively(P < 0.05). There was no deep infection in both groups. In the HEF group and IMN group, mMPTA was (86.9 ± 1.5)° and (89.7 ± 1.8)°(P < 0.05), mPPTA was (80.8 ± 1.9)° and (78.6 ± 2.0)°(P < 0.05), mLDTA was (88.5 ± 1.7)° and (90.3 ± 1.7)°(P < 0.05), while mADTA was (80.8 ± 1.5)° and (78.4 ± 1.3)°(P < 0.05). No significant differences were found between the two groups at the last clinical visit concerning HSS knee joint score and AOFAS ankle joint score, ROM of flexion of keen joint and ROM of plantar flexion of ankle joint (P > 0.05). The ROM of dorsal flexion of ankle joint in IMN group was (30.4 ± 3.5)°, better than (21.6 ± 2.8)° in HEF group (P < 0.05).ConclusionIn terms of final clinical outcomes, the use of either HEF or IMN for STFs can achieve good therapeutic effects. While HEF is superior to IMN in terms of completely closed reduction, early full weight bearing, early bone union and alignment. Nevertheless, HEF has a greater impact on the ROM of dorsal flexion of the ankle joint, and much more care and adjustment are needed for the patients than IMN.

Functional and radiographic assessments of post-traumatic asymmetrical ankle osteoarthritis treatment using supramalleolar osteotomies

PurposeThis study's objective is to assess the effectiveness of supramalleolar osteotomies (SMOT) in the treatment of asymmetrical ankle osteoarthritis in terms of the improvement in alignment assessed radiographically and its impact on symptoms measured by the American Orthopedic Foot and Ankle Society ankle–hindfoot score (AOFAS ankle–hindfoot score).MethodsTwelve patients participated in this prospective observational case series study. Standing anteroposterior, true lateral, and mortise views radiographs were taken. For preoperative planning, the lateral distal tibial angle (LDTA), talar tilt (TT), talocrural angle (TCA), and anterior distal tibial angle (ADTA) were all measured. A medial opening wedge osteotomy mainly was used to treat the varus arthritis ankle. A further oblique fibular osteotomy is frequently necessary.ResultsThe male-to-female ratio was 3:1, and the mean age of the patients was 26.25 ± 13.032 years. There were highly statistically significant differences between pre-and post-operative AOFAS ankle–hindfoot score (p < 0.001). Statistically significant differences concerning ankle range of motion (p = 0.002, < 0.001) of dorsiflexion and planter flexion were detected. Comparison between pre-and post-operative patients' radiology characteristics shows statistically significant differences concerning TT (p = 0.016) and LDTA (p = 0.046).ConclusionSMOT is very effective in the treatment of post-traumatic ankle osteoarthritis and postpones ankle fusion or total ankle replacements. This surgery significantly improves functional and radiological outcomes as well as the range of motion in the ankle. Meticulous preoperative planning by radiological measurements of different angles around the ankle is considered the crucial factor in success of that operation.

Lower Limb Alignment in Patients with Primary Valgus Ankle Arthritis: A Comparative Analysis with Patients with Varus Ankle Arthritis and Controls

Category: Ankle Arthritis; Ankle Introduction/Purpose: A comprehensive analysis of lower limb alignment may be a critical component of successful ankle joint preservation surgery. Although it is widely recognized that the combined effect of lower limb orientation and ankle and hindfoot alignment plays a fundamental role in ankle arthritis, supramalleolar/lower limb alignment has received less attention in valgus ankle arthritis. This study aims to analyze the lower limb alignment of patients with valgus ankle arthritis with primary origin, compared to those with varus ankle arthritis and normal controls. We hypothesize that patients with valgus ankle arthritis will exhibit the opposite pattern of lower limb alignment to those with varus ankle arthritis: valgus mechanical axis, valgus distal tibial plafond, and valgus hindfoot alignment. Methods: A retrospective radiographic analysis was conducted on 61 patients (62 ankles, mean age: 59.2 years) with valgus ankle arthritis with primary origin was performed. Preoperative weightbearing radiographs were used to measure seven radiographic parameters: Talar tilt angle, medial distal tibial angle (MDTA), talar center migration (TCM), anterior distal tibial angle (ADTA), talo-first metatarsal (Meary’s) angle, hindfoot moment arm (HMA), and mechanical axis deviation (MAD). For comparative radiographic analysis, a varus arthritis group with primary origin (n=55, mean age: 59.7 years) and a control group (n=58, mean age: 29.3 years) were included. Subgroup analyses of lower limb alignment were performed in the valgus arthritis group based on the MDTA (greater or less than 90 degrees, subgroup analysis 1) and Meary's angle (greater or less than -20 degrees, subgroup analysis 2). Results: The valgus group had a significantly lower mean MDTA than the control group (p &lt; 0.0001, Figure 1), indicating a varus distal tibial plafond in comparison to the control group. Meary's angle and HMA were significantly lower in the valgus group compared to the varus group (p &lt; 0.05 and p&lt; 0.0001, respectively). On whole limb radiographs, the valgus group showed a greater MAD than the control group (p &lt; 0.05), indicating a varus lower limb alignment. However, there was no significant difference in MAD between the valgus and varus groups (p=0.7031). Subgroup analysis 1 revealed that the MAD was varus- angulated regardless of the MDTA. Subgroup analysis 2 showed that both groups had comparable MDTA (p=0.8504); however, patients with a lower Meary’s angle had a significantly greater MAD. Conclusion: Our findings indicate that a significant proportion of ankles with primary valgus arthritis have a varus tibial plafond and a varus lower limb mechanical axis, which contradicts our current understanding. The similar lower limb and distal tibia orientation and different foot and hindfoot alignment between the valgus and varus group suggest that foot and hindfoot alignment may play an important role in the development of both types of arthritis. This study adds to our understanding of primary valgus ankle arthritis and suggests that lower limb alignment should be analyzed and considered throughout valgus ankle arthritis realignment procedures.

An automatic measurement method for ankle key angles based on point cloud segmentation network

AbstractIn clinical practice, anterior distal tibialangle (ADTA) and lateral distal tibialangle (LDTA) are important evaluation indexes, which can reflect the degree of deformity and determine the type of deformity to a certain extent. The measurement process of these parameters involves the localization of multiple key regions. To simplify the process of measuring ADTA and LDTA, an automatic measurement method is proposed. First, this study constructs an ankle 3D point cloud dataset by 3D reconstruction of ankle electron computed tomography (CT) data, and then, an ankle point cloud segmentation network with a Self‐Attention mechanism and kernel point convolution combined with each other is constructed, and the ankle point cloud data with labels are input to this network to predict the ankle bone feature points. Finally, the segmented feature points are fitted, and the tibial backbone axis and distal tibial articular surface can be drawn, and based on the fitting results, ADTA and LDTA are obtained. Compared with manual measurements by physicians, the proposed method in this study achieved an average error of 0.46° with a passing rate of 97.7% for ADTA measurement. For LDTA measurement, the average error was 0.69° with a passing rate of 98%. The ankle joint key angle measurement system developed in this study meets the accuracy requirements of orthopedics and significantly reduces the workload for doctors.

The Management of Tibial Bone Defects: A Multicenter Experience of Hexapod and Ilizarov Frames.

Bone defects may be managed with bone transport or acute shortening and lengthening using circular external fixation devices. We performed a multicenter retrospective cohort study to compare the outcomes between the Ilizarov frames and hexapod frames for the management of bone defects. Patients treated for bone defects using either Ilizarov or hexapod frames were included for analysis in two specialist institutions. Primary outcomes were time to consolidation, bone healing index (BHI), and external fixator index (EFI). Radiographic parameters included the medial proximal tibial angle, lateral distal tibial angle, posterior proximal tibial angle, and anterior distal tibial angle. There were 137 hexapods and 90 Ilizarov frames in total. The mean time to follow-up was 3.7 years in the hexapod group and 4.0 years in the Ilizarov group. Hexapods had a significantly lower time to consolidation (253 days versus 449 days) (P < 0.0001) and BHI (59.1 days/cm versus 87.5 days/cm) (P < 0.0001). Hexapods had a significantly better EFI (72.3 days/cm versus 96.1 days/cm) (P = 0.0009). Hexapods may confer a significant advantage over Ilizarov frames in the management of bone defects. Time to consolidation, radiographic parameters, BHI, and EFI are all superior in hexapods.

Correction of tibial multiplanar deformities using single Taylor external fixator combined with biplanar osteotomy

To investigate the effectiveness of single Taylor external fixator combined with biplanar osteotomy on correction of tibial multiplanar deformities. Between October 2016 and December 2021, 11 patients with tibial multiplanar deformities (20 sides) were treated with single Taylor external fixator and biplanar osteotomy. Of them, 4 were male and 7 were female; the average age ranged from 13 to 33 years (mean, 21.9 years). Diagnosis included rickets severe genu varum deformity (7 cases, 14 sides), rickets severe genu valgum deformity (2 cases, 4 sides), multiple osteochondromatosis calf deformity (1 case, 1 side), neurofibromatosis medial lower leg anterior arch deformity with short of leg (1 case, 1 side). After fibular osteotomy and tibial multiplanar osteotomy, a Taylor external fixator was installed. After operation, the deformities were corrected successively and fixed completely. The osteotomy healed, then the external fixator was removed. Before operation and at 12 months after operation, the full-length X-ray films were taken. The leg-length discrepancy, medial proximal tibial angle (MPTA), lateral distal tibial angle (LDTA), posterior proximal tibial angle (PPTA), anterior distal tibial angle (ADTA), and tibial rotation angle were measured. The degree of lower limb deformity was scored with reference to a customized tibial mechanical axis scoring table. Osteotomy was successfully completed without neurovascular injury and other complications. The external fixator was adjusted for 28-46 days, with an average of 37 days, and the external fixator was worn for 136-292 days, with an average of 169 days. Mild needle infection during the fixation period occurred in 3 sides, refracture at the distal tibial osteotomy in 1 side after removing the external fixator, and nonunion of the distal fibular osteotomy in 1 side. All patients were followed up 369-397 days (mean, 375 days). At 12 months after operation, the lower limb discrepancy decreased, but there was no significant difference ( P>0.05). MPTA, LDTA, PPTA, ADTA, and tibial rotation angle improved, and the differences in LDTA, ADTA, and tibial rotation angle were significant ( P<0.05). The score of lower limb deformity was significantly higher than that before operation ( P<0.05), and the results were excellent in 9 sides, good in 8 sides, fair in 3 sides, with the excellent and good rate of 85%. Single Taylor external fixator combined with biplanar osteotomy is effective in the correction of tibial multiplanar deformities.

Impact of telescopic intramedullary rodding on the growth of tibia: Comparative experimental study in dogs

IntroductionThe most commonly accepted method of long bone deformity correction in children with osteogenesis imperfecta is surgical realignment with transphyseal telescopic intramedullary rodding. This approach ensures reinforcement of the bone throughout the growth period. Although longitudinal growth does occur with these implants there has been very little work carried out to calculate the effect of such factors as rod position or implant material on growth. We carried out a prospective comparative study on 12 puppies using titanium alloy telescopic tibial rods with and without hydroxyl-apatite coating. The aim of this non-randomized controlled experimental study was to assess the impact of telescopic intramedullary rodding on spontaneous growth of the tibia. Material and methodsTwelve mongrel puppies aged of 5 months underwent intramedullary transphyseal rodding of the right tibia. In group I (6 dogs) a titanium telescopic rod was used, in group II (6 dogs) a titanium rod with hydroxyapatite (HA)-coated threaded end was used. The following radiological criteria were assessed before surgery and every month until age of 12 months (natural fusion of physes in dogs): length of tibia, amount of superposition of inner (male) rod into external (female) rod; alteration of anatomy in terms of joint angles (mMPTA, mLDTA, mPPTA, mADTA); positioning of threaded ends in proximal and distal epiphyses and evidence of premature growth arrest. Parameters were compared with left tibia serving as control segment. The null hypothesis was that neither rod position nor implant material altered growth. ResultsThe transphyseal rods did not lead to irreversible epiphysiodesis in either group. In group II (HA-coated) some loss of residual length was found in all six dogs, over 7mm (5.9%) in comparison to left intact tibia. In contrast to that, in group I (titanium nail) only one animal (16.7%) demonstrated a tibia length discrepancy of 8mm (4.8%). Eccentric ( posterior) positioning of the rod in the distal epiphysis resulted in a procurvatum deformity (increased anterior distal tibial angle) in both groups. We found no failure of telescoping and no loss of fixation of threaded parts in either epiphyses. DiscussionThe presence of telescopic rods with HA-coated threads parts clearly contributes to inhibition of spontaneous longitudinal growth. We hypothesize that HA stimulates maturation of chondrocytes of growth plate. Our findings regarding the potential adverse effect of thread position in the distal physis demonstrate the importance of attempting to place the rod as central as possible. ConclusionTitanium alloy telescopic rods did not reveal significant effect on physeal growth in puppies in comparison to HA-coated implants. Transphyseal HA-coated implants did however inhibit growth plate function with mean loss of length of 5.2% compared to the other side. Eccentric positioning of rods relative to center of physis resulted in angular deformity due to irregular growth. There were no cases of mechanical failure or loss of telescopic function with either group of titanium implant. Level of evidenceII; prospective comparative experimental study.

Anterior Distal Tibial Guided Growth for recurrent equinus deformity in idiopathic Congenital Talipes Equinovarus treated with the Ponseti method

IntroductionDistal Anterior Tibial Guided Growth has been shown to be useful to correct recurrent equinus deformity after open surgical release for Congenital Talipes Equinovarus. This has not been evaluated in a recurrence after use of the Ponseti method, where soft tissue releases are currently understood as the mainstay of treatment. MethodsPatients with recurrence of equinus component of CTEV, who underwent DATGG with at least 6-month follow-up were identified retrospectively. The criteria for performing this procedure were (1) equinus not correctable to neutral passively (2) the feeling of a bony block to dorsiflexion clinically as evidenced by a supple Achilles' tendon at maximum dorsiflexion and (3)a finding of a flat-top talus radiologically. Successful treatment was defined by the achievement of heel strike on observation of gait. Details of the index procedure including concurrent procedures, any complications and their treatment, past and subsequent treatment episodes were retrieved from electronic patient records. Pre-op and last available post-op X-rays were evaluated for change in the anterior distal tibial angle and for flat-top talus deformity. ResultsWe identified 22 feet in 16 patients, with an average follow-up was 25 (8.8–47.3) months. The mean aDTA changed from 88.9 (82.3–94.5) to 77.0 (65.0–83.9) degrees, which was statistically significant (p < 0.0001) using the Paired t-test. Clinically, 17 feet (77 %) obtained a plantigrade foot with a normal heel strike. Complications were identified in 5 feet and include staple migration, oversized staple, superficial infection, iatrogenic varus deformity. Recurrence after completed treatment was noted in one foot. ConclusionThis procedure should form a part of the armamentarium of procedures for treating equinus component of CTEV recurrences even in feet not treated previously by open procedures. When used in patients without significant surgical scarring it helps to address bony and soft-tissue factors, leading to effective treatment. Level of EvidenceTherapeutic Level IV.

The application of intramedullary nails and transmedullary support screws in surgical treatment of distal tibia fracture

Introduction. Fractures of the distal tibia are a difficult treatment problem due to the specific anatomy of this area and the soft tissue injuries resulting from trauma. A distal fracture is short, has a wide marrow cavity, and the asymmetric muscle forces acting on it can cause secondary displacements despite the originally correct positioning. Against the background of the problems presented above, the fixation with an intramedullary nail (IMN) with the use of TMS (trans medullary support) screws directional screws seems to be the best alternative for treatment. Aim. The aim of this study was to evaluate the bone fracture repositioning after surgical treatment of tibia fracture, the time of bone healing and the function of the upper ankle joint. Materials and methods. Forty patients treated surgically due to a fracture of the distal tibia with the use of an intramedullary nail and TMS screws were included in this study. The mean follow-up time was 25.3 months. The function of the ankle joint of the injured limb was evaluated using the AOFAS, VAS and SF-36 questionnaires. Radiological documentation was assessed in terms of correct bone fragment repositioning, placement of directional screws and correct union of the fibula. Post-operative X-rays as well as X-rays taken at the end of treatment in AP and lateral projection were also assessed, evaluating LDTA (lateral distal tibial angle) and ADTA (anterior distal tibial angle). Results. The function of the ankle joint after surgical treatment of a distal tibia fracture using the IMN + TMS method is as follows: AOFAS score 91.5, VAS 2.2 / 10 points. The range of motion of the ankle joint: the angles of ankle movement were significantly greater in the case of the uninjured limb compared to the injured one. Bone union was obtained in all patients. In 80% of patients, it was achieved in less than 6 months. Assessment of repositioning after surgery – mean LDTA angle after surgery was 89 and mean ADTA angle after surgery was 86 (standard LDTA 90, ADTA 85). Conclusions. The function of the ankle joint after treatment of a distal tibial fracture with an intramedullary nail and TMS screws according to the AOFAS and VAS scale was very good and allowed for the anatomical bone fragment fixation. The bone healing after fixation of the distal tibial fracture with an intramedullary nail and TMS screws was shorter than 6 month in most cases.

Tibiotalar and Tibiotalocalcaneal Arthrodesis with Paragon28 SilverbackTM Plating System in Patients with Severe Ankle and Hindfoot Deformity

The treatment of end-stage ankle osteoarthritis (OA) and associated hindfoot deformities remains a major challenge for orthopedic surgeons. Numerous techniques and surgical approaches have been proposed for tibiotalar (TT) and tibiotalocalcaneal (TTC) arthrodesis, from arthroscopic to open, as well as numerous devices proposed for internal fixation (retrograde intramedullary nails, cannulated screws, and plating systems). The aim of this study was to retrospectively analyze the results, with at least 18 months of follow-up, with SilverbackTM TT/TTC Plating System Paragon28 in a group of 20 patients with severe OA and hindfoot deformities (mainly secondary post-traumatic OA). The demographic characteristics and past medical history of the patients were collected and analyzed to identify the cause of the pathology. The degree of OA and deformity were quantified based on foot and ankle weight-bearing radiography and CT examination. Pre- and post-operative clinical and functional scores (ROM, VAS, AOFAS, FFI, and SF-36) and radiographic parameters (anterior distal tibial angle, tibiotalar angle, coronal tibiotalar angle, and hindfoot alignment angle) were evaluated. All of the patients showed clinical and radiographic fusion at an average of 14 weeks (range 12-48), with improvement in pain and functional scores, without major surgical complications and/or infections. Despite the limitations of our study, the results with this new plating system showed good results in terms of bone consolidation, post-operative complications, and improvement of pain and quality of life in patients with severe OA and deformities of the ankle and hindfoot.

Emerged donor limb growth morbidity and malalignment after combined ipsilateral tibial and fibular cortical harvest graft in children. Early follow-up report.

The quantity of bone grafts required in certain pediatric conditions is sometimes substantial. This retrospective study details the radiological changes occurring in the donor leg and ankle following the simultaneous harvest of large diaphyseal cortical grafts from the tibia and fibula in 14 children (16 legs). The following preoperative and follow-up radiological parameters were measured and compared for donor legs: the longitudinal continuous regeneration of fibula, distal fibular station, medial proximal tibial angle, lateral distal tibial angle, posterior proximal tibial angle (PPTA), anterior distal tibial angle and interphyseal angle (tibia diaphyseal angulation) in both coronal and sagittal planes. Additionally, the impact of fibular regeneration in combined harvests was separately analyzed. Children were operated at the mean age of 52 months. Mean follow-up of 25.2 months was available. At follow-up, the donor tibia healed completely in all legs whereas fibular regeneration was complete only in 10 legs (62.5%). At follow-up, ankle valgus was present in 6 out of 16 legs (37%) and tibia valga increased in all legs except one (94%). Procurvatum was present in 7 legs. The fibular nonregeneration group was prone to ankle valgus deformity ( P = 0.014), valgus angulation of tibial diaphysis ( P = 0.0076) and lower mean PPTA ( P = 0.026) when compared to the regenerate group. There was a complication of stress fracture in one donor tibia. Combined tibial and fibular harvest is a major surgical undertaking in children. The donor limbs have their share of complications postharvest, more so when the fibula remains nonregenerated. Serial monitoring of donor sites is emphasized.

Association of Radiographic Alignment, Degree of Ankle Instability, Concomitant Pathology, and VAS Pain Scores after the Brostrom-Gould Procedure for Chronic Ankle Instability

Category: Sports; Ankle; Arthroscopy Introduction/Purpose: The Brostrom-Gould procedure is the gold standard surgical treatment for patients with chronic ankle instability (CAI) whose symptoms are refractory to conservative treatment. The purpose of this study is to investigate the relationship between preoperative radiographic alignment, intraoperative stress testing, concomitant pathology, and postoperative pain scores in patients undergoing Brostrom-Gould procedures. Specific questions included: 1) Is preoperative radiographic alignment predictive of the degree of lateral ankle instability noted intraoperatively? 2) Is the degree of ankle instability associated with the presence of OCD lesions and peroneal tendon pathology? 3) Is the degree of ankle instability associated with postoperative VAS pain? and 4) Does concomitant pathology affect final VAS pain score? Methods: A retrospective study was performed of all patients who underwent lateral ankle ligament reconstruction by a single surgeon from 2002 to 2020. Patients who underwent concomitant hindfoot fusion procedures or ankle arthroplasty were excluded. Demographic and clinical information was recorded from the electronic medical record. Preoperative radiographic measurements were taken using weightbearing ankle films. Intraoperative stress views were evaluated to determine the talar tilt. All data was tested for normality. Parametric and nonparametric univariate statistics were used to determine the relationship between preoperative weightbearing radiographic measurements, preoperative MRI findings, intraoperative talar tilt measurement, and postoperative outcomes. Results: 181 patients with a median follow-up of 1 year were included. Complications included delayed wound healing in 5.6%, superficial infection in 2.8%, and nerve symptoms in 11%. The reoperation rate was 5%, including revision lateral ankle ligament reconstruction (4/181), debridement for infection (1/181), and wound revision (4/181). Increased preoperative anterior distal tibial angle (ADTA) was associated with an increased intraoperative talar tilt (p=0.0073). Increased intraoperative talar tilt was associated with an increased prevalence of osteochondral lesions of the talus (p=0.0176). Mean VAS scores improved from 4.6 preoperatively to 1.9 postoperatively (p&lt;0.0001). Neither the preoperative radiographic alignment nor the degree of intraoperative instability were predictive of final VAS score. Patients with osteochondral lesions had higher final VAS pain scores than patients without osteochondral lesions (p=0.0134). Conclusion: In patients undergoing lateral ankle ligament reconstruction for CAI, preoperative ankle alignment was associated with the degree of ankle instability. It is unclear if an increased ADTA predisposes to great instability, or if larger anterior distal tibia osteophytes are formed in patients with more severe instability, leading to a larger ADTA. Increased instability was associated with a higher rate of osteochondral lesions, and patients with osteochondral lesions tended to have more pain postoperatively. This information may be helpful in counseling patients regarding surgical treatment and postoperative expectations.

Distal Tibia Apex Posterior Angulation: A Normal Anatomic Variant with Side-To-Side Symmetry

Category: Trauma; Ankle Introduction/Purpose: The native sagittal plane alignment of the distal tibia has not been well-described and has implications during the fixation of tibia fractures. Cavovarus foot alignment has been previously thought to influence gastrocsoleus tightness and the potential for anterior talar escape in the setting of an osseous injury in this region. However, the relationship between midfoot alignment and sagittal distal tibia morphology is undescribed. Characterization of this osseous anatomy may be helpful to achieve adequate sagittal alignment during the reduction of distal tibia fractures. The purpose of this study was primarily to characterize distal tibia sagittal morphology and ankle radiographic parameters, determine whether symmetry exists from side-to- side, and secondarily to identify any differences based on midfoot alignment. Methods: 112 patients (60 females, mean age 45.8 years) with bilateral lateral weight-bearing ankle radiographs were retrospectively evaluated (224 ankles). Midfoot morphology was classified as normal, planus, or cavus using Meary's angle (MA) (Planus: MA &lt;-4°, Normal: MA -4°≤x≤4°, Cavus: MA&gt;4°). The angle between the proximal diaphyseal (Line 1) and distal tibia (Line 2) axes was measured, and the location of the center of rotation of angulation (CORA) relative to the plafond was recorded (Figure 1). The horizontal distance (via a line parallel to the floor) from the distal tibia axis (Line 2) to the lateral talar process was measured, as well as the anterior distal tibial angle, and the plafond radius of curvature (ROC). Bilateral ankles and midfoot morphologies were compared using a Mann-Whitney U test and ANOVA, respectively. Correlation was assessed using linear regression. Results: The average distal tibia had 2° of apex posterior angulation with the CORA located 8.0 cm proximal to the plafond. There was no difference by laterality in magnitude of the angulation (p=.358) or distance from the plafond to the CORA (p=.901). The angulation increased as foot alignment transitioned from cavus (1.25°), to normal (1.89°), to planus (3.05°) alignment (r=.32; R2=.102; p&lt;.001). The angulation was larger in men (2.8°) than in women (1.4°) (p&lt;.001) and decreased with increasing patient age (r=.279, R2=.078, p&lt;.001). The lateral talar process was on average 5.9 mm anterior to the distal tibia axis (Line 2), more anterior with cavus versus planus alignment (6.7mm vs. 4.8mm) (p&lt;.001). The average anterior distal tibial angle and plafond ROC were 83.6° and 22.9 mm, respectively, with no significant differences by laterality or midfoot morphology (p&gt;.05 for both). Conclusion: The distal tibia has a consistent apex posterior bow that is symmetric from side-to-side, but variable from patient- to-patient. Distal tibia osseous morphology is related to midfoot alignment, sex, and age. Cavus alignment is additionally correlated with anterior translation of the lateral talar process relative to the distal tibia axis. Surgeons treating distal tibia fractures may consider the use of contralateral imaging as a reduction template to help restore patient-specific sagittal alignment. A tibial nail that ends anterior in the distal segment of a distal tibia fracture should prompt the surgeon to carefully evaluate whether sagittal alignment has been restored.

Lower limb alignment in patients with primary valgus ankle arthritis: A comparative analysis with patients with varus ankle arthritis and healthy controls

BackgroundWhile it is commonly acknowledged that the combined effect of lower limb orientation and ankle and hindfoot alignment play a fundamental role in ankle arthritis, supramalleolar/lower limb alignment has received less attention in valgus ankle arthritis. The purpose of this study was to analyze the lower limb alignment of patients with valgus ankle arthritis with primary origin, compared to that of varus ankle arthritis and normal controls. We hypothesized that patients with valgus ankle arthritis would have the opposite pattern of lower limb alignment as those with varus ankle arthritis. MethodsA retrospective radiographic analysis was performed on 61 patients (62 ankles, mean age, 59.3 ± 12 years) with primary valgus ankle arthritis. On preoperative radiographs, seven parameters, including talar tilt angle, medial distal tibial angle (MDTA), talar center migration, anterior distal tibial angle, talo-first metatarsal (Meary's) angle, hindfoot moment arm (HMA), and mechanical axis deviation (MAD), were measured and compared to those of primary varus ankle arthritis (n = 55; mean age, 59.7 ± 8.1 years) and control patients (n = 59; mean age, 29.3 ± 7.3 years). ResultsThe valgus group had a significantly lower mean MDTA than the control group (p < 0.0001), indicating a varus distal tibial plafond in comparison to the control group. Meary's angle and HMA were significantly lower in the valgus group compared to the varus group (p < 0.05 and p < 0.0001, respectively), indicating a lower medial longitudinal arch and valgus hindfoot alignment. On whole limb radiographs, the valgus group showed a greater MAD than the control group, indicating varus lower limb alignment (p < 0.05). However, the MAD did not differ significantly between the valgus and varus groups (p = 0.7031). ConclusionOur findings indicate that a significant proportion of ankles with primary valgus arthritis have a varus tibial plafond and a varus lower limb mechanical axis. This study contributes to our understanding of primary valgus ankle arthritis and suggests that lower limb alignment should be analyzed and considered throughout valgus ankle arthritis realignment procedures.

Controlling the angle between the distal locking screw and tibiotalar joint tangent helps to reduce the occurrence of misalignment of distal tibial fractures treated with intramedullary nail fixation

BackgroundStudies have shown that on the coronal plane, whether the direction of the distal locking screw is parallel to the tangent line of the tibiotalar joint can be used to determine whether there is varus or valgus deformity after the treatment of distal tibial fractures with intramedullary nail (IMN) fixation. However, there has been no statistical analysis of the included angle on the coronal plane, and there have been no reports on whether there is a relationship between the direction of the distal locking screw on the sagittal plane or the included angle of the tangent line of the tibiotalar joint and the postoperative alignment of distal tibial fractures treated with IMN fixation.ObjectiveOur aim was to evaluate the relationship between the angles formed by the distal locking screw and the tibiotalar joint tangent (ADTTs) on the sagittal and coronal planes and postoperative alignment in the treatment of distal tibial fractures with IMN fixation.MethodsWe performed a retrospective analysis of 100 patients with distal tibial fractures treated with IMN fixation using the suprapatellar approach. On the coronal and sagittal planes, the ADTTs were arranged from small to large and divided into 4 groups, namely, groups A, B, C and D. One-way ANOVA was used to compare the lateral distal tibial angle (LDTA) and anterior distal tibial angle (ADTA) among all groups, and the chi-square test was used to compare the incidence of postoperative tibial misalignment among all groups. Univariate analysis was performed using chi-square tests to identify factors that might be associated with dislocation, including fibular open reduction and internal fixation (ORIF), limited open reduction, ADTT, IMN diameter, injury mechanism, open vs. closed fracture, comminution, and fibular fracture level. Then, the statistically significant variables in the univariate analysis were included in a multivariate logistic regression equation to evaluate the independent factors related to misalignment.ResultsOn the coronal plane, the ADTTs of groups A, B, C and D were < 0°, 0°-1.3°, 1.3°-2.7° and > 2.7°, respectively. The mean LDTAs of groups B and C (0°-1.3° and 1.3°-2.7°), group A (< 0°) and group D (> 2.7°) were 89.5 ± 1.6°, 92.0 ± 3.2° and 85.8 ± 3.5°, respectively (P < 0.01). Deformity greater than 5° were more likely in groups A and D than groups B and C [14 of 50 (28%) vs. 1 of 50 (2%), P < 0.001]. On the sagittal plane, the ADTTs of groups A, B, C and D were < 8.9°, 8.9°-10.4°, 10.4°-11.7° and > 11.8°, respectively. The average ADTAs of groups B and C (8.9°-10.4° and 10.4°-11.7°), group A (< 8.9°) and group D (> 11.8°) were 80.4 ± 1.3°, 83.1 ± 3.7° and 77.9 ± 2.5°, respectively (P < 0.01). Deformity greater than 5° was more likely in groups A and D than groups B and C [13 of 50 (26%) vs. 0 of 50 (0%), P < 0.001]. An ADTT of 0°-2.7° on the coronal plane and 8.9°-11.7° on the sagittal plane (OR: 0.08, P = 0.02) and limited open reduction (OR: 0.21, P < 0.01) were independent factors that reduced the likelihood of misalignment.ConclusionThe alignment of distal tibial fractures after surgery is sensitive to the ADTT and use of limited open reduction. Controlling the ADTT between 0° and 2.7° on the coronal plane and between 8.9° and 11.7° on the sagittal plane is helpful to reduce the occurrence of misalignment after the treatment of distal tibial fractures by IMN fixation.

Comparison of Open Reduction and Internal Fixation With Minimally Invasive Plating in the Treatment of Distal Tibial Fractures: A Retrospective Study.

IntroductionTreatment of distal tibial fractures may be problematic due to their close proximity to the ankle joint and poor skin coverage, resulting in skin problems, deep infection, and malunion. To address these problems, minimally invasive plating methods have been described. In this study, we aimed to compare the clinical findings, radiological findings, and complication rates of patients treated with open reduction or minimally invasive plating.MethodsA total of 44 patients with distal tibial fractures with a mean follow-up period of 20.73 (12-50) months were included in this study retrospectively. The patients were divided into two groups, those who underwent open reduction and internal fixation and those treated with minimally invasive plates. The two groups were statistically compared in terms of radiological and clinical scores and complication rates (p=0.05). Comparative analysis was also performed for three fracture types in both groups.ResultsTwenty patients were treated with a minimally invasive approach and 24 patients were treated with the open reduction method. Age, gender, fracture type, and follow-up times were similar between the two groups (p>0.05). There was no statistically significant difference between postop American Orthopaedic Foot and Ankle Society Ankle-Hindfoot Score (AOFAS), anterior distal tibial angle (ADTA), or lateral distal tibial angle (LDTA) values between both groups. There was also no difference in union times or nonunion rates (p>0.05). There was no statistically significant difference in rates of superficial skin problems or deep infections between the two groups (p>0.05). In comparison regarding fracture types, patients with type C fractures seemed to have better outcomes with minimal invasive plating.ConclusionMinimally invasive plating is a good approach in the treatment of distal tibial fractures. The technique seems to be advisable, especially for patients with type C fractures. However, the rates of skin problems and deep infections are similar to those seen with the open reduction method.

Updates in the Surgical Management of Recurrent Clubfoot Deformity: a Scoping Review.

This article focuses on the current advances in surgical management for clubfoot deformity, supported by up-to-date longitudinal studies on each approach. Long-term analysis following primary and repeated soft tissue releases has demonstrated good results in young patients with low relapse rates. Tibialis anterior transfer following the Ponseti method shows no difference in long-term pedographic analysis in comparison to the Ponseti method alone. Furthermore, tibialis anterior transfer following surgical relapses provides good long-term results with improved correction in talus-first metatarsal angle. Bony osteotomies may also play a role in addressing surgical relapses in older children. However, talar neck osteotomy may result in avascular necrosis of the talar dome. Hexapod external fixation may be considered by experienced surgeons to correct rigid clubfoot deformities in older patients with good long-term results and drastic improvements in pain perception. Long-term analysis of anterior distal tibial epiphysiodesis (ADTE) for recurrent equinus deformity following surgical correction has demonstrated statistical improvements in the anterior distal tibial angle (ADTA) and ankle dorsiflexion. Talectomy and naviculectomy are rarely used in today's practice as long-term studies have demonstrated high relapse rates and residual pain impeding patient mobility. Surgical correction following failure of the conservative approaches can be implemented to achieve full correction in clubfoot deformity. It is difficult to achieve a plantigrade feet with pain-free gait with repeated surgical interventions. Therefore, proper choice of the initial surgical technique is essential for achieving satisfactory long-term outcomes.

Anterior Hemi-epiphysiodesis of the Distal Tibia for Residual Equinus Deformity in Children with Clubfeet

Background: Residual equinus deformity in toddlers with a history of clubfoot can be managed with soft tissue release, provided there is no articular incongruity. Distal tibia osteotomy is a reasonable choice in mature patients with a flattened talus provided the growth plate is closed. Anterior distal tibia hemi-epiphysiodesis is an option for children with articular incongruity who have substantial growth remaining. The aim of this study is to evaluate radiographic and clinical outcomes of this method. Methods: Fourteen clubfoot patients (20 ankles) with residual equinus deformity were treated between 2010-2015 with anterior distal tibial hemi-epiphysiodesis utilizing size appropriate modular plate and screw constructs. Patients were evaluated clinically and radiographically. Oxford Ankle Foot Questionnaire for Children (and caregivers) with supplemental questions were requested at most recent follow-up. Results: There were 12 males and 2 females, mean age 10 years at surgery (50-152 months), with the minimum 18 months of radiographic follow-up (Mean 34 months). Pre-surgical mean radiographic anterior distal tibial angle (ADTA) was 87.8 degrees (79-100) and mean maximum dorsiflexion was -5.7 degrees (-40-7). At follow-up, mean improvement of radiologic ADTA was 18 degrees and mean clinical dorsiflexion improvement was 8.4 degrees. On the Oxford Ankle Foot Questionnaire, children reported a mean functional score of 47% in the “Physical” domain, 71% in “School and Play”, 70% in “Emotional”, and 38% in footwear. Parents reported mean scores of 45% in Physical, 69% in School and Play, 56% in Emotional, and 28% in footwear. Sixty percent of parents reported increased foot flexibility, 80% noted improvement in their child’s walking, and 100% would choose this surgery again. Conclusions: Anterior distal tibial hemi-epiphysiodesis is a viable option for treatment of residual equinus in children with a clubfoot history and open growth plates. Radiographic improvement was at least 2x greater than the clinically measured improvements of dorsiflexion; yet each family would undergo the surgery again as they perceived an improvement in function.