Avulsion Fractures Of Tuberosity Research Articles

Prevalence and classification of accessory navicular bone: a medical record review.

The accessory navicular bone (ANB) is one of the most common accessory bones in the foot. Certain pathologies, such as posterior tibial tendon insufficiency are associated with ANB, and should be differentiated from midfoot and hindfoot fractures such as navicular tuberosity avulsion fractures. There are few studies addressing the prevalence and types of ANB in Saudi Arabia. Determine the prevalence and morphological variations of ANB and its relation with age and sex in patients visiting foot and ankle clinics. Medical record review SETTING: Orthopedic foot and ankle clinic at a university hospital. The presence of ANB was retrospectively analyzed in radiographs from patients who presented to the orthopedic foot and ankle at our university hospital from February 2010 to December 2020. The patients were stratified according to sex, age, and diagnosis. For each ANB, recorded information included site, size, classification, subtypes, and symptomatology. Purposive sampling was used to select the patients for the study (non-probability sampling). Prevalence of ANB in patients attending a foot and ankle clinic. 117 patients and 194 feet. ANB was analyzed in 1006 radiographs from 503 patients. ANB was detected in 117 (23.3%) patients and 194 (19.3%) feet Prevalence was significantly higher in females (67.5%) than in males (32.5%) (Z=5.359, P<.001). The ages ranged from 19 to 86 years, with a mean age of 48.26 (14.5) years. The most common site was bilateral (77 patients, 65.8 %). Type I was the most common type, with a prevalence of 42.1%. There were no significant differences in types in relation to sex, but all types and subtypes differed significantly from each other. ANB was common among patients presenting to the foot and ankle clinic, with an overall prevalence of 23.3%. It should be considered among the differential diagnosis in chronic foot pain, and should be differentiated from midfoot and hindfoot fractures. Further studies with a larger, randomized sample are needed, for more accuracy and to confirm the reported results. Retrospective chart review, non-probability sampling, and use of plain radiographs. None.

727 Pulmonary Embolism Following Posterior Shoulder Dislocation and Traumatic Brachial Plexus Injury - a Case Report

Abstract Traumatic brachial plexus injuries are considered to be among the rarest but most debilitating complications of shoulder dislocation. In addition, posterior shoulder dislocations are also rare, accounting for only 2–4% of all shoulder dislocations. A 40-year-old female patient presented to the emergency department (ED) with a dislocated right shoulder secondary to a mechanical fall. Plain film X-rays demonstrated a posterior dislocation of the humeral head. The shoulder was reduced under procedural sedation. Clinical examination after relocation demonstrated dense flaccid paralysis affecting all dermatomes and myotomes throughout the right upper limb. Urgent magnetic resonance imaging (MRI) of the shoulder showed oedematous thickening and haematoma along the brachial plexus, a large ‘reverse’ Hill-Sachs lesion, greater tuberosity avulsion fracture and glenohumeral capsular tear. The patient was referred to the specialist peripheral nerve injury unit, who advised nerve conduction studies and a magnetic resonance angiogram (MRA) to rule out expanding haematoma. The MRA scan revealed brachial plexus findings consistent with the MRI scan, no active bleeding, however a thrombus in the brachial vein. Two days after the MRA scan, the patient presented to ED with ongoing flaccid paralysis, severe neuropathic pain, and right-sided chest pain. Blood tests revealed a d-dimer &amp;gt;1000. CT pulmonary angiography confirmed extensive bilateral pulmonary emboli and she was commenced on appropriate anticoagulation. Association between brachial plexus injury, flaccid paralysis and venous thromboembolism are rare sequelae resulting from posterior shoulder dislocation. Further studies are required to investigate its incidence and establish whether all patients should receive VTE prophylaxis as standard.

Mechanical Testing of the New Cage for Tibial Tuberosity Advancement with the Cranial Implant Fixation (TTA CF) Technique-Ex Vivo Study on Sheep Model.

Simple SummaryTibial tuberosity advancement is a method of surgical treatment of cranial cruciate ligament rupture in animals.. In previous reports, the biomechanical effectiveness of tibial tuberosity advancement surgeries was evaluated by axial pressure on the tibial tuberosity to test the strength and resistance of the fixation or by pulling on the tuberosity. To our knowledge, there are no reports that examined the strength that is needed to pull out an implant from the tibia after tibial advancement. This study is the first report that focuses on pulling out the TTA implant, which corresponds to the biointegrity and ingrowth of the TTA cage with the tibia.Background: Modifications of tibial tuberosity advancement are well accepted for cranial cruciate rupture repair. We compared the loads that were needed to pull the TTA CF cage out in the two groups. The first group consisted of five sheep in which osteotomy and TTA CF cage fixation were performed as assumed preoperatively. The second group consisted of five sheep in which intraoperative or postoperative discrepancies from preoperative planning were found. This is also the first report describing biomechanical testing after tibial tuberosity advancement with cranial implant fixation (TTA CF) surgical procedures. Results: A total of 10 ovine proximal tibiae were tested biomechanically by tearing out TTA CF implants from the bone. The mean maximal loaded forces to pull out the cage in Group 1, in which fixation of the implant was performed as assumed preoperatively, was 878 ± 61 N, and in Group 2, in which discrepancies from preoperative planning were found, was 330 ± 55 N. The mean implant displacement under maximal load to failure was 2.6 mm and 2.2 mm in Groups 1 and 2, respectively. There was a significant difference between Group 1 and Group 2 in the maximal loads-to-failure; however, the difference in the displacement at maximal loaded forces to pull out the cage was not significant between the groups. Conclusions: The mean maximal loaded forces to pull out the cage was significantly lower in Group 2, where discrepancies from preoperative planning were found (878 ± 61 N vs. 330 ± 55 N). The lower forces that were needed to extract the TTA CF implant from the tibia can lead to the conclusion that biointegration of the implant is also weaker. Correct positioning of the osteotomy line and TTA CF implant is essential for good biointegrity and thus for limiting complications in the form of tibial tuberosity avulsion fracture or tibial shaft fracture.

Poster 198: Risk of Injury During Proximal Hamstring Repair: Anatomy of the Posterior Femoral Cutaneous Nerve

Objectives:Injury to the posterior femoral cutaneous nerve (PFCN) has been described after proximal hamstring repair and fixation of ischial tuberosity avulsion fractures. Variations in the location of the PFCN and its branches have not been described. The purpose of this study was to identify the location and number of branches of the PFCN in relation to the origin of the proximal hamstring tendons.Methods:Fifteen lower torso human cadaveric specimens were dissected in prone position. Skin and subcutaneous tissues were reflected to expose the gluteal and hamstring musculature. The distances between the ischial tuberosity and lateral border of the hamstring, PFCN, perineal branch of the PFCN, and descending femoral branch of the PFCN were measured with digital calipers. Measurements were repeated 3 times and averaged.Results:The PFCN was 30.5 ±11.4 mm lateral to the central tip of the ischial tuberosity (range, 15.7 to 52.0 mm). The average longitudinal distance from the tip of the ischial tuberosity to the point where the perineal branch crossed the hamstrings was 24.1 ±15.0 mm (range, 9.9 to 52.2 mm). The average longitudinal distance to the point where the descending cutaneous branch crossed the hamstrings was 83.3 ±21.3 mm (range, 41.3 to 110.3 mm). The PFCN was nearest to the inferior border of the gluteus maximus 45.8±13.6 mm lateral to the ischial tuberosity (range, 13.6 to 62.1 mm). Eleven specimens had one identifiable perineal branch; four had two distinct perineal branches.Conclusions:The PFCN was in close proximity to the surgical approach utilized during proximal hamstring repair, with the perineal branch consistently crossing the surgical field transversely. The location of these nerves varied substantially among the specimens tested, with some nerves positioned less than 1cm from the ischial tuberosity and some specimens having two perineal branches.

Avulsion fractures of the ischial tuberosity in the pediatric athlete: a systematic review and return to sport analysis.

Apophyseal avulsion fractures of the ischial tuberosity (AFIT) in pediatric athletes are relatively uncommon injuries with treatment and return to sport (RTS) outcomes being largely unknown. The purpose of this review is to perform a systematic review analyzing RTS and predictors of successful RTS for pediatric athletes sustaining AFIT. Studies reporting on athletes strictly under the age of 18 years sustaining an AFIT with reported RTS status were included. RTS was analyzed based on injury acuity, mechanism, and management, whereas the incidence of any complications was recorded. A total of 33 studies comprising 90 cases of AFIT were identified. The mean age of athletes sustaining injuries was 14.7 + 1.4 years (range, 9-17 years), most commonly participating in soccer ( n = 25), sprinting ( n = 21), and gymnastics ( n = 7). Acute trauma during sporting activities was responsible for 74.4% ( n = 77/90) of injuries. A total of 82% ( n = 74/90) of athletes reported successful RTS at an average of 7.0 + 5.0 months. Athletes undergoing surgery had a significantly higher RTS rate ( n = 36/38, 94.7%) compared with athletes treated nonoperatively (n = 38/52, 73.08%; P = 0.008). When reported, a high rate of misdiagnosis was reported (39.4%, n = 28/71). Complications were reported in 15.8% ( n = 7/38) and 32.7% ( n = 17/52) of athletes managed surgically and conservatively, respectively. As such, the high rate of misdiagnosis and subsequent high rate of complications and poor rate of RTS highlight the importance of accurate diagnosis and treatment. Future prospective studies evaluating patient outcomes based on fracture displacement, sporting activity, and management strategies are warranted to better treat pediatric athletes. Study design: Level IV, systematic review.

Factors Contributing to the Need for Non-Elective Explant following Surgical Repair of Tibial Tuberosity Avulsion Fracture.

The aim of this study was to evaluate factors contributing to the need for non-elective explant following surgical repair of tibial tuberosity avulsion fractures. Retrospective multicentre case-control study. Over a 5-year period, dogs (n = 63) that underwent surgical repair of tibial tuberosity avulsion fractures (n = 64) were considered. Dogs that underwent a non-elective explant were compared with those that did not. Continuous variables were compared with the Mann-Whitney U test. Categorical variables were compared with the Fisher's exact test. Variables which were significant on univariate analysis were entered into a multiple logistic regression model. Significance was set at p < 0.05. Non-elective explant was performed in 20/64 fractures and elective explant was performed in 2/64 fractures. Neutered dogs were found to be 19 times (95% confidence interval: 2.1-172) more likely to require explant compared with intact dogs (p = 0.009). Every 0.25 mm increase in average pin size was found to make it 2.5 times (95% confidence interval: 1.3-4.9) more likely to require explant (p = 0.006). The findings suggest that use of the smallest appropriate pin should be considered for standard surgical repair of tibial tuberosity avulsion fractures to minimize the risk of requiring non-elective explant.

Inferior shoulder dislocation with greater tuberosity avulsion fracture treated with Traction-Countertraction method in a rural hospital: A case report and literature review

Introduction. Inferior shoulder dislocation is considered a rare event. Although there is a seemingly low chance of occurrence, this condition should not be prematurely ruled out in the presence of acute shoulder pain. Case. A 45 years old woman complained of pain in her left shoulder and was unable to bring her arm lower than 90° after a car accident. The patient unintentionally put her left arm outstretched above her head to avoid head impact during the crash, causing hyperabduction of the shoulder. She experienced pain, numbness and could not move the ipsilateral hand. Her left arm was locked in hyperabduction (100°), and her elbow was extended. Close inspection showed a loss of left shoulder contour. On palpation, the humeral head was palpable in the axilla. Anteroposterior X-ray view confirmed inferior dislocation of the left shoulder with associated greater tuberosity fracture. A closed reduction under general anesthesia with the traction-counter traction technique was conducted as commonly used in rural settings. After perfect anatomical reduction was obtained and confirmed with X-ray, the patient was immobilized using an arm sling. The shoulder was immobilized for three weeks in adducted position to support soft tissue healing. Physiotherapy was started after three weeks. Conclusion. Inferior shoulder dislocation is a rare orthopedic pathology that should not be easily dismissed in post-traumatic shoulder pain. The mechanism of injury is characterized by downward force or lever mechanism on the hyperabducted arm. Orthopedic surgeons in rural areas could utilize the Traction-countertraction method.

Minimally invasive open reduction of greater tuberosity fractures by a modified suture bridge procedure.

BACKGROUNDMost greater tuberosity fractures can be treated without surgery but some have a poor prognosis. The surgical procedures for avulsion fractures of the humeral greater tuberosity include screw fixation, suture anchor fixation, and plate fixation, all of which have treatment-associated complications. To decrease surgical complications, we used a modified suture bridge procedure under direct vision and a minimally invasive small incision to fix fractures of the greater tuberosity of the humerus.AIMTo investigate the clinical efficacy and outcomes of minimally invasive modified suture bridge open reduction of greater tuberosity evulsion fractures.METHODSSixteen patients diagnosed between January 2016 and January 2019 with an avulsion-type greater tuberosity fracture of the proximal humerus and treated by minimally invasive open reduction and modified suture bridges with anchors were studied retrospectively. All were followed up by clinical examination and radiographs at 3 and 6 wk, 3, 6 and 12 mo after surgery, and thereafter every 6 mo. Outcomes were assessed preoperatively and postoperatively by a visual analog scale (VAS), the University of California Los Angeles (UCLA) shoulder score, the American Shoulder and Elbow Surgeon score (ASES), and range of motion (ROM) for shoulders.RESULTSSeven men and nine women, with an average age of 44.94 years, were evaluated. The time between injury and surgery was 1-2 d, with an average of 1.75 d. The mean operation time was 103.1 ± 7.23 min. All patients achieved bone union within 3 mo after surgery. VAS scores were significantly decreased (P = 0.002), and the mean degrees of forward elevation (P = 0.047), mean degrees of abduction (P = 0.035), ASES score (P = 0.092) were increased at 3 wk. The UCLA score was increased at 6 wk (P = 0.029) after surgery. The average degrees of external rotation and internal rotation both improved at 3 mo after surgery (P = 0.012 and P = 0.007, respectively). No procedure-related deaths or incision-related superficial or deep tissue infections occurred.CONCLUSIONModified suture bridge was effective for the treatment of greater tuberosity evulsion fractures, was easier to perform, and had fewer implants than other procedures.

Outcomes of operatively treated calcaneal tuberosity avulsion fractures

BackgroundCalcaneal tuberosity avulsion fractures are uncommon but when present should be treated emergently due to the high risk of skin compromise. Multiple fixation techniques have been reported in the literature but there are little data regarding the ideal fixation construct and outcomes. We aimed to characterize the clinical presentation, focussing on soft tissue compromise and outcomes of operatively treated calcaneal tuberosity avulsion fractures with its associated complications. MethodsA retrospective review of all surgically treated calcaneus fracture in our institution from Jun 2008 to Jun 2017 was done. We reviewed patients’ demographics, types of avulsion fracture, presence of preoperative skin compromise, age of fracture, time to operation, types of fixation construct, postoperative weight bearing regime, union rates, complications and revision surgeries if present. ResultsWe found 9 patients from our database who met the inclusion criteria. They had an average age of 55.6 (range: 43 - 90) years with 5 (55.6%) of them aged 60 years and older. Seven (77.8%) patients were female. Four out of 9 patients (44.4%) presented with soft tissue compromise (3 cases of skin tenting and 1 case of blistering). None of them required soft tissue reconstructive surgery for skin defects postoperatively. However, 2 patients (22.2%) had wound complications after surgery requiring prolonged wound care for up to 4 months. There were 2 patients with fixation failure whereby both were allowed weight bearing prematurely. All of them were able to ambulate independently at their last review. ConclusionCalcaneal tuberosity avulsion fractures have a high prevalence of soft tissue compromise and warrant early attention. This condition should be treated as both a bony and soft tissue injury rather than just a bony fracture alone. Management of this injury should take into account fracture reduction and stable fixation with neutralization of the Achilles tendon forces.

Why Mechanism Matters: A Literature Review of Simultaneous Ipsilateral Tibial Tuberosity Avulsion and Patella Fracture With Case Report

Simultaneous ipsilateral tibial tuberosity avulsion and patella fractures are rare in adults. They are often associated with patients who have underlying bone disease and other medical co-morbidities. Here we describe a case where this injury was attributed to direct trauma and demonstrate our department’s management for such an injury. In addition to our case report, we have performed a systematic literature review to identify other cases of the same injury. Only four other cases have been reported. Here we summarise and compare the management and outcome measures reported in each case.All patients are managed differently, yet all authors report satisfactory outcomes. With this being a relatively rare injury, further research is required to establish a gold standard for management of such patients.

Avulsion Fractures of the Calcaneal Tuberosity: A Single-Center Review of Outcomes and Complications.

The goal of this investigation was to determine the incidence of complications and revision surgery after calcaneal tuberosity avulsion fractures, to describe experience with different fixation constructs, and to compare revision surgery rates between tuberosity and tongue-type fractures of the calcaneus. This was a retrospective study at a single level 1 trauma center between 2001 and 2019, including patients with calcaneal tuberosity avulsion fractures compared with patients with calcaneal tongue-type fractures. Twenty-nine tuberosity fractures (23 surgical and six nonsurgical) and 37 tongue-type fractures (29 surgical and eight nonsurgical) were treated during the study period. Revision surgery was more common in the tuberosity group (26% versus 7%, P = 0.013). In the tuberosity group, 35% experienced some degree of implant failure, with 13% catastrophic loss of reduction and 22% loss of initial reduction with eventual union. Fragment size and initial displacement were not associated with revision surgery. No patients with implant failure noted in the tongue-type group. Calcaneal tuberosity fractures showed significantly higher rate of revision surgery and failure of fixation compared with tongue-type fractures.

Tibial Tubercle Avulsion Fractures in Adolescents: A Narrative Review &amp; Case Report

Intro: Tibial tuberosity avulsion fractures are rare fracture patterns accounting for less than 1% of all pediatric fractures. These fractures occur when there is a sudden unbalancing of forces through the patellar tendon that separates the tibial tubercle from the anterior portion of the proximal tibia. These forces are commonly introduced in sporting activities and show a predominance for adolescent males. Treatment with open reduction internal fixation commonly results in favorable outcomes with minimal complications. In this presentation, we explore a case of a tibial tuberosity avulsion fracture and give an in-depth review of all aspects concerning this fracture pattern. Case Description: A 14-year-old male with no significant past medical history presented via emergency medical services after a ground level fall while playing basketball. Radiographs of the left knee and tibia revealed an Ogden Type III, distracted avulsion fracture of the tibial tuberosity with suprapatellar effusion. Surgical intervention was achieved through open reduction internal fixation of the left tibial tubercle. Discussion: Although a relatively rare fracture pattern, this case demonstrates a classic presentation and treatment of a tibial tuberosity avulsion fracture. This case serves as a reminder that despite the rarity of the injury, a clinician with an appropriate index of suspicion can accurately diagnose and treat this fracture and achieve positive outcomes in returning the patient to pre-injury activities. For those reasons, we provide a comprehensive overview of all aspects regarding this fracture pattern including the anatomy, embryology, mechanism of action, predisposing conditions, treatment considerations, complications and associated injuries.

Lesser Tuberosity Avulsion Fracture in an 11-Year-Old Baseball Player due to Batting

Case We report an 11-year-old male who sustained a lesser tuberosity avulsion fracture of the proximal humerus upon making contact with a baseball during an at-bat. This injury was neglected for 14 months and was eventually detected by an axillary radiograph and subsequent MRI. He successfully underwent an open surgical repair and regained full range of motion and level of activity at 1-year follow-up. Conclusion In pediatric baseball players, lesser tuberosity avulsion fractures may occur upon striking a baseball with a bat. Even after being neglected for several months, these injuries can be treated successfully with an open surgical repair.

OPEN SURGERY FOR PATELLAR TENDON RUPTURE AND TIBIAL TUBEROSITY AVULSION FRACTURE IN PRE-EXISTING OSGOOD SCHLATTER LESION: A CASE REPORT

Background: In Osgood Schlatter Disease, despite being a self-limiting disease during adolescence, various complications of Osgood Schlatter Disease could also present in adulthood. An uncommon injury pattern requires surgical treatment. This study aims to understand the implementation of surgery in managing complications case of Osgood Schlatter Disease.Case Report: We present a rare case of complete patellar tendon rupture and tibial tuberosity avulsion fracture following a low-energy motor vehicle accident landing on his left knee in a 42 years old active male, who later discovered is having a pre-existing Osgood Schlatter Disease. This patient is treated with an open surgery fixating the tibial tuberosity using a single lag screw and eight tension wires, followed by primary repair of the patellar tendon, including its retinaculum.Discussion: Weakened structure from pre-existing Osgood Schlatter lesion may cause uncommon and profound injury pattern that requires surgical treatment. Conservative treatment no longer has a place in this case. The various surgical treatment methods have been reported; however, surgical modification technique is performed accordingly due to the complicated case presentation.Conclusion: Surgical treatment is the most suitable treatment option in managing this uncommon injury pattern complication of Osgood Schlatter Disease.

CLASSIFYING ISCHIAL TUBEROSITY AVULSION FRACTURES BY OSSIFICATION STAGE AND TENDON ATTACHMENT

Background:Currently, there is no classification system for ischial tuberosity avulsion fractures.Hypothesis/Purpose:To provide a new classification system for ischial tuberosity fractures based on the ossification pattern of the apophysis.Methods:We performed a retrospective records review of patients diagnosed with ischial tuberosity avulsion fractures at our institution from 2008 to 2018. Skeletal maturity (Modified Oxford score [MOS], Risser score), fracture type, size, and displacement were recorded based on initial injury radiographs. We reviewed a large series of pelvic CT and MRI scans from patients aged 10-19 years old to assess the ossification pattern and tendinous attachments of the ischial tuberosity. Pelvic CT review demonstrated a reproducible 5-stage pattern of ossification spanning the age of 13-19 years for males and 12-17 years for females (Figure 1). Review of available CTs and MRIs indicated that the semimembranosus attaches at the most lateral ossification center, followed by the conjoint tendon and adductor magnus as one moves medially (Figures 1). We created a classification system based on location of the ischial tuberosity avulsion fracture: Type 1 (lateral – semimembranosus and conjoint tendons) or Type 2 (complete – semimembranosus, conjoint, and adductor magnus tendons). An A or B descriptor was then added to distinguish minimally displaced (<1 cm) and displaced (≥1 cm) fractures, respectively (Figure 2).Results:We identified 45 ischial tuberosity fractures. Mean age was 14.4 years (range, 10.3–18). Males accounted for 82% of the cohort. Type 1 fractures accounted for 47% of cases and 53% were classified as Type 2. Type 1 fractures were associated with younger age chronological age (p=0.001), lower MOS (p=0.002), lower Risser score (p=0.002), less displacement (p=0.001), and smaller size (p<0.001), when compared with Type 2 fractures (Table 1). Of the 45 patients, 18 had >6 month follow-up with 56% going on to non-union. Non-union was associated with greater displacement (p=0.016) and size (p=0.027). When comparing union rates by fracture location, 33% of Type 1 fractures progressed to non-union, while 78% percent of Type 2 suffered a non-union; however, this difference did not reach statistical significance (p=0.153) (Table 2).Conclusion:In younger patients (ages 13-15 years), the lateral ossification centers of the ischial tuberosity, at which the hamstrings attach, are at risk for isolated avulsion injury. However, in older patients (16-18 years), coalescence of the hamstring and adductor magnus ossification centers predispose patients to a combined avulsion injury consisting of a larger fragment and with greater displacement.Figure 1:Figure 2:

Delayed proximal hamstring tendon repair after ischial tuberosity apophyseal fracture in a professional volleyball athlete: a case report

BackgroundIschial tuberosity apophyseal fractures are avulsion fractures of the anatomic footprint of the proximal hamstring tendons. Generally, these injuries are rare and frequently occur in skeletally immature, active patients due to incomplete ossification. Depending on the fragment displacement, non-operative or operative treatment approaches are used.Case presentationWe report a case of a 29-year-old professional volleyball athlete who has suffered from a nonunion avulsion fracture for 14 years. Isolated suture anchor fixation was performed after open excision of a large bony fragment followed by excellent clinical and functional outcome at 1 year postoperatively.ConclusionIn conclusion, avulsion fractures of the ischial tuberosity with large fragments and restrictions to activities of daily living due to pain can, in individualized cases, be treated with an open excision of the fragment followed by repair of the proximal hamstring tendons using suture anchors.

Biomechanical Comparison of Three Stabilization Methods for Tibial Tuberosity Fractures in Dogs: A Cadaveric Study.

The aim of this study was to compare the biomechanical properties of a hybrid external skeletal fixator (HESF) construct to the placement of paired interfragmentary Kirschner wires alone, and pin and tension band wire (PTBW) fixation for the stabilization of simulated tibial tuberosity fractures in dogs. Tibias were harvested from 12 skeletally mature dog cadavers weighing 20 to 30 kg. An osteotomy was made through the base of the tibial tuberosity, which was subsequently repaired with either paired Kirschner wires, PTBW fixation or a HESF. A tensile load was applied to the tibial tuberosity until failure occurred. Mode of failure was described and biomechanical parameters obtained were compared between fixation groups. The PTBW fixation and HESF construct afforded greater stiffness and load at 3 mm of axial displacement compared with fixation with Kirschner wires alone. There was no significant difference in stiffness and load at 3 mm displacement between PTBW and HESF fixation. Failure occurred by bending and pullout of the Kirschner wires for all fixation groups, preceded by untwisting of the knot in PTBW specimens. The HESF may provide a favourable alternative to PTBW fixation for tibial tuberosity avulsion fracture stabilization in dogs with substantial remaining growth potential.

Surgical repair techniques, functional outcome, and return to sports after apophyseal avulsion fractures of the ischial tuberosity in adolescents

PurposeAmong juvenile apophyseal avulsion injuries of the pelvis in adolescents, fractures of the ischial tuberosity are rare but sustainably debilitating. Also because informations on surgical repair options are very sparse and so far limited to general reviews, reports of individual cases or heterogeous small case series, practitioners, patients and their parental environment still feel a comprehensible hesitation regarding operative treatment. Therefore we intended to investigate patient related outcome measurements and return to sports rates after different types of surgical intervention in an own case series, so far unprecendented in its size.MethodsPatient data of adolescents that underwent surgical intervention for a displaced apophyseal avulsion fracture of the ischial tuberosity between 01/2015 and 12/2019 in our institution were gathered. Patients were then evaluated using the hamstring injury specific Perth Hamstring Assessment Tool (PHAT). Furthermore the return to sports level in comparison to the particular pre-injury level was rated.ResultsEleven adolescents with an acute or chronic mean fragment dislocation of 3.3 cm (SD ± 1.7) underwent surgical intervention in the assigned period. The mean post-operative PHAT score was 86.9 (0–100, SD ± 11.9) and thus good to excellent. The majority of adolescents (10/11) was able to return to their pre-injury sports, whereas 63.6% achieved full or nearly full level.ConclusionsSurgical refixation or restoration of aphoyseal avulsion fractures of the ischial tuberosity result in good to excellent outcomes and return to sport rates, irrespective of the type of intervention. Here prompt diagnosis with a timely intervention seems more promising than delayed interventions in chronic cases. Beyond 1.5 cm of fragment displacement affected patients should be counselled for surgical intervention.

Classifying Ischial Tuberosity Avulsion Fractures by Ossification Stage and Tendon Attachment.

We propose a new classification system for ischial tuberosity fractures in adolescents that is based on the ossification pattern of the apophysis. We performed a retrospective review of patients who were diagnosed with ischial tuberosity avulsion fractures at a single institution from 2008 to 2018. Skeletal maturity and fracture location, size, and displacement were recorded based on initial injury radiographs. The fractures were classified by location as being lateral (type 1) or complete (type 2). Pelvic computed tomography (CT) review demonstrated 5 stages of ossification. We then reviewed pelvic CT and magnetic resonance imaging scans to assess the tendinous insertions at the ischial tuberosity apophysis. Reliability analysis was performed. We identified 45 ischial tuberosity fractures. The mean patient age was 14.4 years (range, 10.3 to 18.0 years). Boys accounted for 82% of the cohort. Forty-seven percent of the fractures were classified as type 1, and 53% were classified as type 2. Type-1 fractures were associated with younger age (p = 0.001), lower Risser score (p = 0.002), lower modified Oxford score (p = 0.002), less displacement (p = 0.001), and smaller size (p < 0.001) when compared with type-2 fractures. Of the 45 patients, 18 had follow-up of >6 months, with 56% going on to nonunion. Nonunion was associated with greater displacement (p = 0.016) and size (p = 0.027). When comparing union rates by fracture type, 33% of type-1 fractures progressed to nonunion, while 78% percent of type-2 fractures progressed to nonunion; however, this difference was not significant (p = 0.153). A review of the advanced imaging indicated that type-1 fractures involved the semimembranosus and conjoined tendons, whereas type-2 fractures also involved the adductor magnus tendon. We propose a new classification system based on the ossification pattern of the ischial tuberosity apophysis that reflects the skeletal maturity of the patient, the size and location of the fracture, and the amount of displacement, and likely predicts the probability of subsequent nonunion. The ischial tuberosity ossifies in a pattern similar to the iliac crest as described by Risser, and this pattern of ossification dictates the size of the ischial tuberosity avulsion fracture fragments and the involved tendons.

Pediatric Calcaneal Tuberosity Avulsion Fracture: A Case Report and Literature Review

Introduction: Calcaneus fractures are rare in the pediatric population, and avulsion fracture of the calcaneal tuberosity is even less common. In adults, those fractures are usually associated with poor bone quality, however, this is not the case in children. It is a fracture that requires emergent intervention to prevent devastating skin and soft-tissue-related complications. Case Report: We report a case of a 9-year-old female who had a displaced calcaneal tuberosity fracture with heel skin impending compromise, after a fall at an indoor gymnastic facility. The child had a history of acute lymphoblastic leukemia, diagnosed at age 4, she was in remission at the time of injury. In the present report, besides reporting a rare injury among the pediatric population, we also describe the operative management, the post-operative course, and we review the literature. Conclusion: Pediatric calcaneal tuberosity fractures, although rare, can lead to devastating complications if not addressed promptly, and should be treated in an expedited fashion. Keywords: Pediatric, calcaneal tuberosity, skin compromise.