Lateral Talo-first Metatarsal Angle Research Articles

Effect of Unilateral Accessory Navicular Bone on Radiologic Parameters of Foot

This study aimed to compare the radiologic parameters of both feet in patients with unilateral accessory navicular bone (ANB) and evaluate the differences from one another. Forty-one patients with unilateral ANB volunteered to participate in this study from August 2019 to January 2020. Patient data, including age, sex, body mass index (BMI), type of ANB, and presence of symptoms were obtained. Group 1 comprised 23 patients with asymptomatic unilateral ANB, and group 2 comprised 18 patients with symptomatic unilateral ANB. Seven radiologic parameters were evaluated assessing hindfoot, midfoot, and forefoot alignment-calcaneal pitch angle, talocalcaneal angle, tibiocalcaneal angle, naviculocuboid overlap (NCO), talonavicular coverage angle (TNCA), anteroposterior talo-first metatarsal angle, and lateral talo-first metatarsal angle. The mean age of patients was 40.1 years in group 1 and 42.6 years in group 2. Mean BMI was 25.2 in group 1 and 26.6 in group 2. No significant differences were noted in the radiologic parameters between the ANB and contralateral sides in all patients. The radiologic parameters of both feet in symptomatic and asymptomatic patients were not significantly different. No significant differences were noted between the affected sides of type 1 and 2 ANB and contralateral sides in terms of the radiologic parameters. BMI was significantly correlated with NCO and TNCA. This study demonstrated that the presence of an accessory navicular bone did not affect radiologic parameters of the foot. Radiologic parameters of both feet in symptomatic patients were not significantly different. Level III, diagnostic, comparative study.

Outcomes of Flexible Flatfoot Deformity Reconstruction in the Young Patient

Category:Hindfoot; Midfoot/ForefootIntroduction/Purpose:Surgical correction of the collapsing flatfoot deformity has been well studied in the literature, with the average patient being a female in her 50s. While reconstruction of the flexible, symptomatic flatfoot in children and adolescents has been described, assessment of outcomes across age groups is limited. Therefore, the purpose of our study is to compare the clinical and radiographic outcomes in younger patients 30 years or less undergoing flatfoot reconstruction with that of older patients. In addition, the procedures performed for reconstruction and the incidence of subsequent reoperations were compared between the two groups.Methods:Ninety-four feet (51 left, 43 right) in 87 patients who underwent reconstruction for flexible collapsing flatfoot deformity were divided into 2 groups based on age: <= 30 years (n=22), and >30 years (n=72). Exclusion criteria included tarsal coalition or neuromuscular disease. Average age and BMI was 20.8 years (range, 13 to 30) and 26.8 (range, 18 to 38) in the younger cohort, and 57.5 years (range, 35 to 81) and 29.8 (range, 18 to 46) in the older cohort. Preoperative and minimum 2-year postoperative PROMIS scores were compared. Average follow-up was 30.6 and 27 months in the younger and older cohorts, respectively. We assessed five radiographic parameters both preoperatively and postoperatively, including talonavicular (TN) coverage angle, lateral talo-first metatarsal angle (Meary’s), lateral talocalcaneal angle, calcaneal pitch, and hindfoot moment arm (HMA). Operative reports and hospital records were reviewed to compare procedures performed for reconstruction as well as subsequent reoperations.Results:Younger patients demonstrated significant preoperative to postoperative improvements in Physical Function (p=0.01), Pain Interference (p<0.01), and Pain Intensity (p<0.01), with significantly greater improvement in Physical Function by 4.2 points (95% CI = 0.9 to 7.6, p=0.01) compared to the older cohort. All radiographic parameters demonstrated significant improvement (p<0.01) with no differences between the two groups. Younger patients were more likely to undergo Cotton osteotomy and deltoid ligament repair (p=0.01), and less likely to undergo flexor digitorum longus transfer, first tarsometatarsal fusion, spring ligament repair, and posterior tibial tendon repair (p<0.01). There were 8 (36.4%) reoperations in the younger group with painful hardware removal (ROH), and 27 (37.5%) in the older group (1 conversion to triple arthrodesis, 3 non-unions, 4 repeat medializing calcaneal osteotomies, 19 ROH).Conclusion:While the approach to surgical correction of younger patients with symptomatic, collapsing flatfoot deformity is similar to that of older adult patients, our data suggest that age may play a role in clinical outcomes, procedures indicated, and subsequent corrective reoperations. These findings point towards the efficacy of surgical correction in addressing this symptomatic pathology at a younger age.

Contribution of First Tarsometatarsal Joint Fusion to Deformity Correction in the Treatment of Adult Acquired Flatfoot Deformity

Category:Midfoot/Forefoot; OtherIntroduction/Purpose:Severe adult-acquired flatfoot deformity (AAFD) is often associated with painful medial column collapse at the naviculocuneiform (NC) joint. The purpose of this study was to examine the role of first tarsometatarsal (1st TMT) fusion combined with subtalar fusion in correcting deformity at this joint.Methods:We retrospectively analyzed 40 patients (41 feet) who underwent 1st TMT and subtalar (ST) fusion as part of a flatfoot reconstructive procedure. We assessed six radiographic parameters both preoperatively and at a minimum of 6 months postoperatively, including talonavicular (TN) coverage angle, lateral talo-first metatarsal angle, lateral talocalcaneal angle, calcaneal pitch, hindfoot moment arm, and a newly defined navicular-cuneiform incongruency angle (NCIA). Patient-Reported Outcomes Measurement Information System (PROMIS) clinical outcomes were assessed preoperatively and at a minimum 1 year follow-up.Results:The NCIA demonstrated excellent interobserver reliability, with no significant change between pre- and postoperative measurements. All other radiographic parameters, except calcaneal pitch, demonstrated statistically significant improvement postoperatively (p <0.01). Overall, patients had statistically significant improvement in all PROMIS domains (p <0.01), except for depression. Worsening NC deformity was not associated with worse patient-reported outcomes.Conclusion:Our data suggests that when addressing collapse of the medial arch in patients with AAFD, fusion of the 1st TMT joint in combination with other procedures leads to acceptable radiographic and clinical outcomes. There was no change in deformity at the NC joint at short-term follow-up, and patients achieved significant improvement in multiple PROMIS domains. Based on our findings, deformity through the NC joint does not significantly impact clinical outcomes. In addition, the NCIA was established as a reliable radiographic parameter that can be used to assess NC deformity in the presence of talonavicular and/or 1st TMT fusion.

Radiographic Union of Evans Osteotomy Without Fixation

Category:Hindfoot; OtherIntroduction/Purpose:The Evans osteotomy is a lateral column lengthening procedure of the calcaneus that is commonly used to correct flexible flatfoot deformities. There is no consensus on whether fixation is needed to avoid nonunion and calcaneocuboid subluxation when performing this osteotomy. We assessed the nonunion rate and correlated extent of subluxation with graft size in an unfixed Evans osteotomy with an allograft wedge and no pinning of the calcaneocuboid joint at any point in the largest series of the procedure to date. Surgeries were performed in patients undergoing flexible flatfoot reconstruction.Methods:We retrospectively reviewed 120 consecutive patients who had undergone 145 unfixed Evans osteotomies by a single surgeon with allogenic bone graft for flatfoot reconstruction between January 2013 and October 2017, with a mean follow-up of 62.5 (range 9.4-266.7) weeks. The calcaneocuboid joint was not pinned during the procedure. Data were collected using clinical and radiographical examination during regular follow-up.Results:A total of 137 feet (94.5%) underwent a double calcaneal osteotomy with an associated medial displacement calcaneal osteotomy (MDCO). There was one nonunion (0.69%). The mean time to union was 10.8 (range, 6.7-17.9) weeks. There was significant improvement in all radiographic parameters postoperatively, including calcaneal pitch, talonavicular uncoverage, anteroposterior and lateral talo-first metatarsal angle, lateral column length, and naviculocuboid overlap (p<0.05). Minor postoperative calcaneocuboid joint subluxation (1.51 +- 2.3 mm) occurred in 72 of 118 feet (61.0%) and had no correlation with wedge size (r=0.06; 95% CI, -0.13, 0.24; p=0.6).Conclusion:An unfixed Evans osteotomy for symptomatic flatfoot deformity resulted in a significant improvement in the radiographic alignment of the foot with an exceptionally rare nonunion rate. Detectable calcaneocuboid subluxation was common but minimal in extent and was not correlated with wedge size in this series in which wedges were less than 12 mm in the maximum dimension. This report represents the largest series of the Evans procedure to date.

Relationship between Hallux Valgus and Pes Planus in Adult Patients

This study aimed to determine whether the degree of pes planus was associated with hallux valgus severity and hallux valgus surgery outcomes. A total of 122 feet were retrospectively analyzed after hallux valgus surgery. The hallux valgus angle, inter-metatarsal angle, lateral talo-first metatarsal angle, calcaneal pitch, and talonavicular coverage angle were measured. The Foot and Ankle Outcome Score and Foot Function Index were evaluated. A significant correlation between radiographic parameters of pes planus and hallux valgus severity, radiographic outcomes, Foot and Ankle Outcome Score, and Foot Function Index were not noted. The hallux valgus angle and inter-metatarsal angle changed significantly after the surgery (p < .001 and p < .001, respectively); however, a significant difference was not noted between the pes planus and non-pes planus groups (p = .279 and p = .632, respectively). A significant interaction between the time points and groups was not observed with respect to the hallux valgus angle (p = .311) and inter-metatarsal angle (p = .417). Multivariable logistic regression revealed that none of the radiographic parameters for pes planus affected hallux valgus recurrence. Pes planus in adult patients is not significantly associated with hallux valgus severity and recurrence, radiographic outcomes, or clinical scores.

Comparison of outcomes of arthrodesis and reconstruction (advancement), posterior tibial tendon with excision of accessory tarsal navicular bone (Kidner procedure) in type 2 accessory navicula

BackgroundThe therapeutic outcome of the local arthrodesis surgery for type 2 accessory navicula (AN) is rarely reported. This study aimed to compare the clinical outcomes between Kidner and arthrodesis procedures for type 2 AN. MethodsSixteen patients (20 feet) with symptomatic type 2 AN receiving surgical treatment in our hospital between November 2013 and December 2015 were retrospectively included. Ten patients (13 feet) underwent the Kidner surgery (Kidner group) and 6 patients received local arthrodesis procedure (arthrodesis group). Radiographic indices before/after surgery were compared between the two groups. Patient’s satisfaction with surgery outcome was evaluated by patient self-assessment questionnaire. ResultsThe calcaneal pitch angle was significantly increased after surgery in both groups (bothp<0.01), while the talocalcaneal coverage angle and lateral talo-first metatarsal angle were not significantly changed after surgery. There was no significant difference regarding the postoperative changes in the three radiographic indices between the two groups. In the arthrodesis group, 3 patients (4 feet) had an excellent outcome, 2 patients (2 feet) a good outcome, and 1 patient (1 foot) had a fair outcome. In the Kidner group, 6 patients (8 feet), 2 patients (3 feet), 1 patient (1 foot) and 1 patient (1 foot) had excellent, good, fair, and poor treatment outcomes, respectively. The rate of good-to-excellent outcomes was comparable between the arthrodesis group and Kidner group (83% vs. 80%, p=0.696). ConclusionOur results suggested that both the Kidner surgery and arthrodesis surgery were an effective treatment for symptomatic type 2 AN.

Changes in Gait and Radiographic and Clinical Results of Calcaneal Lengthening Osteotomy in Children with Idiopathic Flexible Flatfoot.

BackgroudIn this study, we aimed to analyze kinematic and kinetic changes in gait and to assess radiographic and clinical improvement after calcaneal lengthening osteotomy (CLO) in children with idiopathic symptomatic flexible flatfoot deformities.MethodsThe study group consisted of 22 children (28 feet) with idiopathic symptomatic flexible flatfoot, which was treated by CLO as an index operation. We excluded patients with flatfoot that developed secondary to neuromuscular diseases. There were 18 boys (22 feet) and 4 girls (6 feet). The average age of the patients was 10.8 ± 1.51 years. Surgical results were assessed by radiologic imaging, clinical evaluation, and gait analysis, which were performed before surgery and 1 year after surgery. Medical records were reviewed to check postoperative complications.ResultsTalonavicular coverage was recovered to 16.7° from 32.7° (p < 0.01). Lateral talo-first metatarsal angle and calcaneal pitch angle increased by 20.1° and 9.9°, respectively (p < 0.01). Weight-bearing radiographs demonstrated a decrease in the anteroposterior angle and lateral talocalcaneal angle by 6.9° and 10°, respectively (p < 0.01). Hindfoot valgus was corrected to near neutral position after CLO. Kinematic results showed that the ankle valgus angle in the coronal plane was reduced from 35.48° preoperatively to 16.64° postoperatively during gait (p < 0.05). The preoperative out-toeing gait (preoperative foot progression angle, 20.31°) was also normalized to 14.21° postoperatively. The kinetics results showed that the push-off moment (maximum ankle plantar flexion) on the sagittal plane increased from 0.66 Nm/kg preoperatively to 0.83 Nm/kg postoperatively (p < 0.01). The mean Yoo score was 9.2 ± 1.05 postoperatively: satisfactory in 24 cases (86%) and unsatisfactory in 4 cases. Of the 4 unsatisfactory cases, 2 cases were overcorrection and 2 cases were undercorrection, and 3 of them were well managed by wedge foot insoles.ConclusionsThe 3-dimensional deformities of the flexible flatfoot were effectively corrected by CLO, based on the morphological assessment using radiologic imaging. The correction was well maintained during gait at 1 year after the operation.

Radiographic Evaluation of Adult Acquired Flatfoot Correction with Augmented Spring Ligament Repair

Category:Flatfoot reconstructionIntroduction/Purpose:Adult acquired flatfoot often results from posterior tibial tendon dysfunction followed by attenuation of the ligamentous support of the medial longitudinal arch of the foot. The spring ligament is the strongest ligamentous support for the talonavicular joint making it a viable target for flatfoot reconstruction procedures. There are concerns that direct repair of the spring ligament complex could result in failure as the already attenuated tissues of the ligament stretch out with mobilization and weight bearing. Suture tape augmentation of ligament repairs has shown greater loads to failure in biomechanical testing; however, there is a paucity of data surrounding clinical and radiographic outcomes of flatfoot reconstruction with augmented spring ligament repair.Methods:A retrospective review was performed of patients who underwent flatfoot reconstruction including spring ligament repair with suture tape augmentation between July 2014 and August 2017. Weight bearing radiographs were obtained for all patients both pre-operatively and at their last available follow-up. All radiographs were assessed by two surgeons for validated radiographic parameters including AP talocalcaneal angle, AP talo-first metatarsal angle, AP talar uncoverage, lateral talocalcaneal angle, lateral talo-first metatarsal (Meary) angle, lateral medial cuneiform-fifth metatarsal height, and lateral calcaneal pitch. Paired sample T-tests were used to compare pre-operative and post-operative radiographic measurements to assess for correction of these parameters.Results:57 patients met inclusion criteria. The average time to final radiographic evaluation was 47 weeks (10 to 200 weeks). All radiographic parameters assessed showed significant correction when compared to pre-operative measurements. The average correction for each parameter included 6.02 degrees for AP talocalcaneal angle (p<0.001), 10.96 degrees for AP talo-first metatarsal angle (p<0.001), 12.65% for AP talar uncoverage percentage (p<0.001), 4.27 degrees for lateral talocalcaneal angle (p<0.001), 11.35 degrees for lateral talo-first metatarsal (Meary) angle (p<0.001), 8.31 mm for lateral medial cuneiform-fifth metatarsal height (p<0.001), and 2.91 degrees for lateral calcaneal pitch (p<0.001). Post-operative complications occurred in 5 patients.Conclusion:Reconstruction of adult acquired flatfoot with spring ligament repair using suture tape augmentation is a safe procedure that resulted in significant weight bearing radiographic correction at an average of 47 weeks follow-up.

Structural Effect of Long-Term Use of Medial Arch Support Insole on Children with Pediatric Flexible Flatfoot

Category:Midfoot/ForefootIntroduction/Purpose:This prospective study aimed to rule out the effect of the normal physiologic maturation in applying medial arch support insole for patients with pediatric flexible flatfoot (PFFF).Methods:From January 2005 to June 2015, 18 patients (34 feet) in group 1 (insole was continuously applied) and 16 patients (32 feet) in group 2 (untreated group) were enrolled. A medial arch support insole was applied from age 10-11 years until radiographic physeal closure.Results:In group 1, the talonavicular coverage angle, lateral talo-first metatarsal angle, calcaneal pitch angle, and medial cuneiform height were significantly changed at final follow-up, although all values were still within the abnormal range. Moreover, no significant differences were found in any of the increments of the radiographic parameters between groups 1 and 2.Conclusion:Radiographic improvements were found in both medial arch support insole-treated and untreated groups even if all radiographic values were still within the abnormal range. This means that PFFF could be somehow improved with heel stretching exercise until the physes were closed. Further, hindfoot alignment remained unchanged regardless of the medial arch support insole application.

Postoperative Medial Cuneiform Position is Correlated with Patient-Reported Outcomes Following Cotton Osteotomy for Reconstruction of the Stage II Adult Acquired Flatfoot Deformity

Category:Hindfoot, Midfoot/ForefootIntroduction/Purpose:During reconstruction of the stage II adult acquired flatfoot deformity (AAFD), residual supination of the midfoot is often addressed with an opening wedge medial cuneiform (Cotton) osteotomy after adequate correction of the hindfoot valgus deformity. The purpose of this study was to determine if there was a correlation between postoperative alignment of the medial cuneiform using the previously described cuneiform articular angle (CAA) on lateral radiographs and postoperative patient-reported outcomes using the Foot and Ankle Outcome Score (FAOS).Methods:Sixty-three feet in 61 patients with stage II AAFD who underwent a Cotton osteotomy as part of a flatfoot reconstruction were included the study. The CAA, medial arch sag angle (MASA), and lateral talo-first metatarsal (Meary’s) angles were measured on postoperative weightbearing lateral radiographs at a minimum of 40 weeks postoperatively. Pearson’s correlation analysis was used to determine if there was an association between postoperative radiographic angles and FAOS at a minimum of 24 months postoperatively. Patients were also divided into mild plantarflexion (CAA> or =-2 degrees) and moderate plantarflexion (CAA<-2 degrees) groups, and Wilcoxon rank-sum tests were used to identify whether there were differences in clinical outcomes between the two medial cuneiform positions. A postoperative CAA of -2 degrees was chosen because it is two standard deviations from the average postoperative CAA following a flatfoot reconstruction (Castaneda et al. FAI 2012).Results:Postoperative CAA was significantly positively correlated with the postoperative FAOS symptoms (r=.27, P=.03), daily activities (r=.29, P=.02), sports activities (r=.26, P=.048), and quality of life (r=.28, P=.02) subscales. A positive correlation indicates that higher postoperative FAOS scores are associated with a decreased amount of plantarflexion of the medial cuneiform (i.e. a more positive CAA). Patients in the mild plantarflexion group had statistically and clinically better outcomes compared with the moderate plantarflexion group in the FAOS symptoms (P=.04), daily activities (P =.04), and sports activities (P=.01) subscales (Figure 1). Graft size was correlated with postoperative CAA (r =-.30, P = .02) but not correlated with any postoperative FAOS subscale (all P values > .40).Conclusion:Our study suggests that the surgeon should avoid excessive plantarflexion of the medial cuneiform and use the Cotton osteotomy judiciously as part of a flatfoot reconstruction for stage II AAFD.

Foot and Ankle Radiographic Parameters in Korean Adults Vary by Sex and Age

Although many radiographic measurements of the foot and ankle have been used, reference values for normal functional groups are rarely reported. These can change according to sex and age; therefore, this study aimed to: (1) determine reference values for radiographic foot and ankle angles in an asymptomatic healthy Korean population, and (2) compare differences in the measurements according to sex and age. A total of 200 healthy volunteers were recruited, including 100 young adults (50 males, 50 females) aged 20 to 35 years, and 100 older adults (50 males, 50 females) aged 60 to 69 years. Weightbearing ankle anteroposterior views, talar tilt, and tibiotalar angles were measured. On the weightbearing foot anteroposterior views, the hallux valgus, hallux interphalangeal, and talo-first metatarsal angles were measured. On the weightbearing lateral foot views, the calcaneal pitch, lateral talo-calcaneal, lateral talo-first metatarsal, and lateral calcaneo-first metatarsal angles were measured. Values were stratified by sex and age, and statistically compared. The hallux valgus, calcaneal pitch, and lateral calcaneo-first metatarsal angles were affected by both sex and age; the hallux interphalangeal angle was affected by age and the lateral talo-first metatarsal angle by sex. We presented reference values for foot and ankle radiographic measurements in a healthy Korean population; several radiographic indices varied significantly by sex or age, which were grossly similar to previous studies based on white race. The study data can serve as a basis for evaluation of foot and ankle disorders.

P 094 – Sit-to-stand of rheumatoid arthritis post-menopausal women vs. healthy post-menopausal – Antero-posterior displacement of centre of gravity and centre of pressure

Although many radiographic measurements of the foot and ankle have been used, reference values for normal functional groups are rarely reported. These can change according to sex and age; therefore, this study aimed to: (1) determine reference values for radiographic foot and ankle angles in an asymptomatic healthy Korean population, and (2) compare differences in the measurements according to sex and age. A total of 200 healthy volunteers were recruited, including 100 young adults (50 males, 50 females) aged 20 to 35 years, and 100 older adults (50 males, 50 females) aged 60 to 69 years. Weightbearing ankle anteroposterior views, talar tilt, and tibiotalar angles were measured. On the weightbearing foot anteroposterior views, the hallux valgus, hallux interphalangeal, and talo-first metatarsal angles were measured. On the weightbearing lateral foot views, the calcaneal pitch, lateral talo-calcaneal, lateral talo-first metatarsal, and lateral calcaneo-first metatarsal angles were measured. Values were stratified by sex and age, and statistically compared. The hallux valgus, calcaneal pitch, and lateral calcaneo-first metatarsal angles were affected by both sex and age; the hallux interphalangeal angle was affected by age and the lateral talo-first metatarsal angle by sex. We presented reference values for foot and ankle radiographic measurements in a healthy Korean population; several radiographic indices varied significantly by sex or age, which were grossly similar to previous studies based on white race. The study data can serve as a basis for evaluation of foot and ankle disorders.

Porous Titanium Wedges are an Alternative in Lateral Column Lengthening for Adult Acquired Flatfoot Deformity

Category: Hindfoot Introduction/Purpose: Lateral column lengthening (LCL) is a common procedure for reconstruction of stage II flexible adult acquired flatfoot deformity (AAFD). The recent development of porous titanium wedges for this procedure provides an alternative to allograft and autograft. The purpose of this study was to report radiographic and clinical outcomes achieved with porous titanium wedges in LCL. Methods: A retrospective analysis of 34 feet in 30 patients with AAFD that received porous titanium wedges for LCL from January 2011 – October 2014. Deformity correction was assessed using both radiographic and clinical parameters. Radiographic correction was assessed using the lateral talo-first metatarsal angle, the talonavicular uncoverage percentage, and the first metatarsocuneiform height. The hindfoot valgus angle was also obtained. Results: Patients were followed from a minimum of six months up to 48 months (mean 16.1 months). Patients underwent concomitant procedures including medial displacement calcaneal osteotomy (94.1%), flexor digitorum longus transfer (70.6%), posterior tibial tendon tenolysis (64.7%), gastrocnemius recession (20.6%), and cotton osteotomy (4.9%). Postoperative radiographs demonstrated significant correction in all three radiographic criteria as well as the hindfoot valgus angle compared to their preoperative measurements. There were no cases of nonunion, no wedge migration, no infections, and no patients required removal of hardware. The most common complication was calcaneocuboid joint pain (14.7%). Conclusion: AAFD is a problem with various treatment modalities. Porous titanium wedges in LCL can achieve good radiographic and clinical correction of AAFD with a low rate of nonunion and other complications.

Double wedge osteotomy and subtalar arthrodesis for rockbottom malunion after calcaneal fracture

Category: Hindfoot Introduction/Purpose: The pathoanatomy characteristics of the rockbottom malunion after calcaneal fracture include severe loss of calcaneal height, which result in the horizontal of the talus in the ankle mortise and anterior ankle impingement. This study was carreid out to evaluate the clinical results of double wedge osteotomy and subtalar arthrodesis for rockbottom malunion after calcaneal fracture. Methods: From February 2014 to February 2015, 9 cases of calcaneal rockbottom malunion after calcaneal fracture were treated with wedged osteomy and subtalar arthrodesis. And 8 patients get final followup. Weight bearing X ray were taken before the surgery and at final followup. Talar declination, lateral talocalcaneal angle, lateral talo-first metatarsal angle and Bohler’s angle were used to evaluate the correction of the malunion. The American Orthopaecid Foot and Ankle Society (AOFAS) ankle-hindfoot scale and visual analog scale (VSA) for pain were collected. SPSS 22.0 software was used for Statistical analysis. Results: The average time for bone union was 17.1 weeks (12weeks~22weeks). The talar declination was improved from 2.5 ° (- 6°~13°) preoperatively to 13.25° (5°~19°) postoperatively (P&lt;0.001); the lateral talocalcaneal angle was improved from -0.25° (-15°~10°) preoperatively to 0.25° (7°~25°) postoperatively (P&lt;0.001); the talo-first metatarsal angle was improved from 21.13° (10°~30°) preoperatively to 9.88° (5°~14°) postoperatively (P&lt;0.001); and the calcaneal Bohler’s angle was improved from -25.6 ° preoperatively to 22.4 °postoperatively(P&lt;0.001). The AOFAS scale was 26.63 (12~53) preoperatively, and 79.75 (72~89) at final followup (P&lt;0.001); the VAS scale for pain was 7.5 (6~9) preoperatively, and 2.6 (2~3) at final followup (P&lt;0.001). Conclusion: Wedge osteomy and sutalar arthrodesis can effectively correct the malunion, restore the calcaneal height and hindfoor alignment. Pain was relieved after correction, and the function of the ankle and hindfoot was restored.

MRI Analysis for Clarification of Mechanism of Ankle Osteoarthritis

Category: Ankle Arthritis Introduction/Purpose: We have previously studied the relationship between Takakura–Tanaka classification stages and bone-marrow edema (BME) in order to elucidate the pathology of ankle osteoarthritis (ankle OA) on magnetic resonance imaging (MRI). Moreover, we have investigated that BME onset on the talocrural joint can be predicted according to radiographic findings. In the present study, we focused on the changes around the subtalar joint to examine the relationship between talar lateral process impingement (TLPI) and foot and ankle joint alignment, and whether TLPI can be predicted on the basis of X-ray findings. Methods: We assessed 30 feet of 30 patients who had a diagnosis of ankle OA in our hospital and underwent MRI. Alignment was assessed radiographically by measuring the tibial anterior surface angle (TAS), the tibial lateral surface angle (TLS), the lateral talo-first metatarsal angle (LTMT), the lateral talocalcaneal angle (LTC), and the tibial axis–talar ratio (T-T ratio). MRI was obtained with the talocrural, subtalar and Chopart joints into 22 subdivided areas to examine the frequency of BME for each patient. TLPI was considered positive (+) when BME was found in the talar lateral process. The patients were divided into two groups according to TLPI positivity or negativity. Their BME frequency was examined, and significant differences in radiographically measured values were analysed with a t-test. Results: In the TLPI (+) group, BME development occurred at significantly higher frequencies in all areas except those surrounding the lateral process (p = 0.002). In addition, TLS was significantly lower (p = 0.02), and LTMT was significantly higher (p = 0.04). When the cut-off value on the ROC curve was set at TLS of =74° and LTMT of =19°, TLPI onset could be predicted with a sensitivity of 75% and a specificity of 71%. Conclusion: Our results revealed that in the TLPI (+) group, progression of the anteriorly opened talocrural joint and talar dorsiflexion may be causing the talar lateral process to hit the calcaneus. Furthermore, in the TLPI (+) group, BME in other areas also occurred at higher frequencies, and symptoms around the ankle joints may be occurring at multiple locations. The fact that TLPI could be predicted from radiography findings suggests that this may be a potential predictive tool of the severity of clinical symptoms.

Natural progression of radiographic indices in juvenile hallux valgus deformity

BackgroundThis study aimed to estimate the annual change in radiographic indices for juvenile hallux valgus (JHV) and to analyze the factors that influence deformity progression. MethodsPatients aged <15 years who had JHV and were followed up for at least 1 year were included. Hallux valgus angle (HVA), hallux interphalangeal angle, intermetatarsal angle, metatarsus adductus angle, distal metatarsal articular angle, anteroposterior talo-first metatarsal angle, and lateral talo-first metatarsal angle were evaluated. The progression rate of HVA was adjusted by multiple factors by using a linear mixed model. ResultsA total of 133 feet were included. The HVA and distal metatarsal articular angle both increased by 0.8° per year (p<0.001 and p=0.003, respectively). HVA increased by 1.5° per year (p<0.001) at under the age of 10, and the HVA progression in the older patients was not statistically significant. ConclusionsJHV deformity could progress with aging. Most deformity progression could occur before the age of 10 years.

Sex Differences in Pedobarographic Findings and Relationship between Radiographic and Pedobarographic Measurements in Young Healthy Adults.

BackgroundAlthough pedobarographic measurement is increasingly used for clinical and research purposes, relatively few published studies have investigated normative data. This study examined pedobarographic findings in young healthy adults with regard to sex-related differences and correlations among measurement indices.MethodsTwenty young healthy adults (mean age, 22.4 years; standard deviation, 1.2 years; and 10 males and 10 females) were included. Weight bearing anteroposterior (AP) and lateral foot radiographs were taken, and dynamic pedobarographic data during treadmill walking and maximum ankle dorsiflexion were obtained. AP talo-first metatarsal angle, naviculocuboid overlap, lateral talo-first metatarsal angle, and plantar soft tissue thickness were measured on foot radiographs. Pedobarographic data including peak pressure and pressure-time integral were measured on five plantar segments: medial forefoot (MFF), lateral forefoot (LFF), medial midfoot (MMF), lateral midfoot (LMF), and heel.ResultsMale and female subjects significantly differed in body mass index (BMI, p < 0.001), AP talo-first metatarsal angle (p = 0.018), soft tissue thickness under the metatarsal head (p = 0.040) and calcaneal tuberosity (p < 0.001), maximum dorsiflexion during stance phase (p = 0.041), peak pressure on the MFF (p = 0.005) and LFF (p = 0.004), and pressure-time integral on the MFF (p = 0.018) and heel (p = 0.001). BMI was significantly correlated with soft tissue thickness under the metatarsal head (r = 0.521, p = 0.018) and calcaneal tuberosity (r = 0.585, p = 0.007), peak pressure on the MFF (r = 0.601, p = 0.005) and LFF (r = 0.487, p = 0.029), pressure-time integral on the heel (r = 0.552, p = 0.012), and total pressure-time integral (r = 0.755, p < 0.001). Maximum dorsiflexion demonstrated significant negative correlations with pressure-time integral on the MFF (r = −0.595, p = 0.007) and total pressure-time integral (r = −0.492, p = 0.032). Pressure-time integral varus/valgus index was significantly correlated with pressuretime integral forefoot/heel index (r = 0.472, p = 0.036).ConclusionsSex-related differences in pedobarographic examination were observed, which could provide useful information in setting appropriate treatment goals and obtaining appropriate control data. The effects of subtalar motion in distributing plantar pressure should be investigated in a future study.

Wedge osteotomy and subtalar arthrodesis for rockbottom malunion after calcaneal fracture

Objective To evaluate the clinical results of wedge osteotomy and subtalar arthrodesis for rockbottom malunion after calcaneal fracture. Methods From February 2014 to February 2015, 9 cases of rockbottom malunion after calcaneal fracture were treated with wedged osteotomy and subtalar arthrodesis. They were 8 men and one woman, aged from 31 to 49 years (average, 40.5 years). Weight-bearing X-rays were taken before surgery and at final follow-ups. Talar declination, lateral talocalcaneal angle, lateral talo-first metatarsal angle and Bohler’s angle were used to evaluate correction of the malunion. The American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot scale and visual analogue scale (VAS) for pain were used to assess functional recovery. Results Eight of them were fully followed up for an average time of 30.6 months (from 27 to 38 months). All the osteotomy sites and subtalar joints obtained bony union after an average of 17.1 weeks (from 12 to 22 weeks). The talar declination was improved from 2.5° (from-6° to 13°) preoperatively to 13.2° (from 5° to 19°) postoperatively, the lateral talocalcaneal angle from-0.2° (from-15° to 10°) preoperatively to 20.2° (from 7° to 25°) postoperatively, the talo-first metatarsal angle from 21.1° (from 10° to 30°) preoperatively to 9.9° (from 5° to 14°) postoperatively, and the calcaneal Bohler’s angle from-25.6° (from-39° to-10°) preoperatively to 22.4°(from 10° to 35°) postoperatively. The AOFAS score averaged 26.6° (from 12 to 53) preoperatively and 79.7 (from 72 to 89) at the final follow-up; the VAS score averaged 7.5 (from 6 to 9) preoperatively and 2.6 (from 2 to 3) at the final follow- up. Both scores demonstrated improvements after operation. Conclusions Since the pathoanatomy of rockbottom malunion after calcaneal fracture consist in severe loss of calcaneal height, resulting in horizon-talization of the talus and anterior ankle impingement, wedge osteotomy and sutalar arthrodesis can effectively correct the malunion, restore the loss of calcaneal height and hindfoot malalignment, and relieve the symptoms. Key words: Calcaneus; Fractures, bone; Arthrodesis; Malunion; Osteotomy

The Deltoid Ligament

Category: Basic Sciences/Biologics, Hindfoot, Midfoot/Forefoot Introduction/Purpose: The medial ligaments are integral in stabalising the medial column. Failure of these structures causes adult acquired flatfoot deformity (AAFD). The superomedial-cancaneonavicular component of the spring ligament(SLC) includes the medial capsule of the talonavicular joint and merges with the anterior superficial component of the deltoid complex, stabilising the talonavicular joint. However, when disrupted, it does not cause planovalgus deformity until the foot is cyclically loaded. We hypothesise that the next structure in the sequential failure cascade is the tibionavicular component of the Deltoid complex(TN) . With the failure of the SLC and the secondary effect of the posterior tibial tendon this ligament is the gatekeeper to stability of the midfoot, preventing plantar subluxation of the talus, and maintaining the radiographic lateral talo-first metatarsal angle. Methods: A prospective case control study using a novel MRI technique to image the TN. We scanned 20 consecutive normal feet and 20 with clinical and radiological AFFD. The AFFD group was subdivided into normal or abnormal TN. We assessed for pathology in the SLC, deltoid ligament (with conventional sequences) and posterior tibial tendon (PT). Imaging of the TN was performed using a novel sequence, which was an oblique view in both T1 and T2 sequence in the plane of the TN ligament to identify the normal ligament in the control group, and compare it to the patients with clinical AAFD. All patients had weight bearing AP and lateral radiographs in order to measure the calcaneal pitch, lateral talo-first metatarsal angle, and talo-calcaneal angle. We followed up patients, the end point being surgery or definitive conservative management and discharge. Results: 2 distinct groups of patients were identified. Normal TN(11/20) A mixture of medial ligament pathology was associated with this. All were managed conservatively and discharged from follow-up. The mean Meary’s angle was 6.8°. Abnormal TN(9/20) The ligament was thickened proximally, with distal attenuation and intrasubstance oedema. On sagittal sequence it had the appearance of an omega(O), with dorsal bulging and high signal on T2. The mean Meary’s angle was 13.2°(p 0.013). All patients had PT dysfunction and 8 had SLC attenuation. 5 of these patients have undergone corrective surgery. None had been discharged. The prevalence of the omega in AFFD was 30%. We confirm that the prevalence of deltoid involvement in AFFD is high, particularly in patients with more severe disease. Conclusion: Imaging of the TN is valuable in AFFD, and adds no cost or risk. There is no doubt that sequential failure of the medial ligaments occurs in AFFD. We have shown that the deltoid is involved more often than previously reported. In those with normal TN, our preliminary findings suggest that management can focus on protecting the medial structures. When the TN is attenuated(‘O’ on MRI), this represents a foot transitioning to a more severe deformity, both clinically and structurally. From our experience, these patients are more likely to have a progressive, less flexible planovalgus deformity, often requiring corrective surgery.

Radiographic Measurements Associated with the Natural Progression of the Hallux Valgus Deformity during at Least Two Years of Follow-up

Category: Bunion Introduction/Purpose: There have been few longitudinal studies regarding hallux valgus deformity. This retrospective study aimed to investigate the radiographic measurements associated with the progression of hallux valgus deformity during at least two years of follow-up. Methods: Seventy adult patients (mean age, 58.0 years; standard deviation [SD], 12.3 years; 13 males and 57 females) with hallux valgus who were followed-up for at least two years and underwent weight-bearing foot radiography were included. Radiographic measurements included the hallux valgus angle (HVA), hallux interphalangeal angle, intermetatarsal angle (IMA), metatarsus adductus angle, distal metatarsal articular angle (DMAA), tibial sesamoid position, anteroposterior (AP) talo-first metatarsal angle, and lateral talo-first metatarsal angle. Progression of hallux valgus deformity was defined as an increase of 5 degrees or more in the HVA during follow-up. Patients were divided into progressive and non-progressive groups. Binary logistic regression analysis was performed to identify factors that significantly affect the progression of hallux valgus deformity. The correlation between change in HVA and changes in other radiographic indices during follow-up was analyzed. Results: Eighteen out of 70 patients showed progression of 5 degrees or more in the HVA during the mean follow-up of 47.0 months (SD, 19.8 months). The DMAA (p=0.027) and AP talo-first metatarsal angle (p=0.034) at initial presentation were found to be significant factors affecting the progression of hallux valgus deformity. Change in the HVA during follow-up was significantly correlated with changes in the IMA (r=0.423; p=0.001) and DMAA (r=0.541; p&lt;0.001). Conclusion: Special attention needs to be given to patients with pes planovalgus and increased DMAA during follow-up. Change in HVA was significantly correlated with changes in IMA and DMAA. Therefore, progression of hallux valgus deformity is considered to be closely related to the progressive instability of the first tarsometatarsal joint.