Ankle Syndesmosis Research Articles

Statistical shape model-based tibiofibular assessment of syndesmotic ankle lesions using weight-bearing CT.

Forced external rotation is hypothesized as the key mechanism of syndesmotic ankle injuries, inducing a three-dimensional deviation from the normal distal tibiofibular joint (DTFJ) alignment. However, current diagnostic imaging modalities are impeded by a two-dimensional assessment, without considering ligamentous stabilizers. Therefore, our aim is threefold: (1) to construct an articulated statistical shape model of the normal DTFJ with the inclusion of ligamentous morphometry, (2) to investigate the effect of weight-bearing on the DTFJ alignment, and (3) to detect differences in predicted syndesmotic ligament length of patients with syndesmotic lesions with respect to normative data. Training data comprised non-weight-bearing CT scans from asymptomatic controls (N = 76), weight-bearing CT scans from patients with syndesmotic ankle injury (N = 13), and their weight-bearing healthy contralateral side (N = 13). Path and length of the syndesmotic ligaments were predicted using a discrete element model, wrapped around bony contours. Statistical shape model evaluation was based on accuracy, generalization, and compactness. The predicted ligament length in patients with syndesmotic lesions was compared with healthy controls. With respect to the first aim, our presented skeletal shape model described the training data with an accuracy of 0.23 ± 0.028 mm. Mean prediction accuracy of ligament insertions was 0.53 ± 0.12 mm. In accordance with the second aim, our results showed an increased tibiofibular diastasis in healthy ankles after weight-bearing. Concerning our third aim, a statistically significant difference in anterior syndesmotic ligament length was found between ankles with syndesmotic lesions and healthy controls (p = 0.017). There was a significant correlation between the presence of syndesmotic injury and the positional alignment between the distal tibia and fibula (r = 0.873, p < 0,001). Clinical Significance: Statistical shape modeling combined with patient-specific ligament wrapping techniques can facilitate the diagnostic workup of syndesmosic ankle lesions under weight-bearing conditions. In doing so, an increased anterior tibiofibular distance was detected, corresponding to an "anterior open-book injury" of the ankle syndesmosis as a result of anterior inferior tibiofibular ligament elongation/rupture.

Elite Athletes Successfully Return to the Preinjury Level of Sport Following Ankle Syndesmosis Injuries: A Systematic Review and Meta-Analysis.

To comprehensively review and report the outcomes of ankle syndesmotic injury management in elite athletes. Three databases were searched for articles reporting the rate of return to sport following treatment of ankle syndesmotic injuries in elite athletes (collegiate or professional level). Ten articles and 440 athletes were included. Articles reporting the rate of return to sport following high ankle sprain injury in elite athletes. Data collected included demographics, type of treatment received, and return to sport (RTS) information. A random effects model was used. The estimated overall rate of RTS was 99% (95% CI, 95.5-99.9). The mean time to RTS was 38 ± 18 (range, 14-137) days. Of the 440 athletes, 269 (269/440%, 61%) were treated nonoperatively (nonoperative group); the rate of RTS was 99.6%, and the athletes returned at a mean time of 29 ± 14 (range, 13-45) days. A total of 171 athletes (171 of 440%, 39%) underwent surgical treatment (operative group). All (171 of 171%, 100%) athletes returned at a mean time of 50.3 ± 13 (range, 41-137) days. Almost all athletes who underwent surgery had suture button fixation (164 of 171 athletes, 96%), and the mean time to RTS was 7 weeks with 9.1% complication rate. Elite athletes with ankle syndesmosis injury return to sport at an extremely high rates, following operative or nonoperative treatment. Return to the preinjury level of competition should be expected at 4 weeks and 7 weeks in high-level athletes who undergo nonoperative and operative management, respectively. Suture button fixation was used by the majority of studies reporting surgical management of ankle syndesmosis injuries in athletes.

The Australian ankle syndesmosis injury survey

Background & ObjectiveThe ankle syndesmosis is frequently disrupted in ankle injuries, with higher incidence in concomitant ankle fractures. There is debate regarding the most appropriate surgical management of these injuries, with the development of suture-button devices challenging the conventional approach of surgical stabilisation with syndesmotic screws. The primary aim of this study was to assess current practice variation at a national level, enabling a comparison with reported practice around the world. The secondary aims were to assess practice variation between operative indications and inconsistencies between surgeon device usage and personal preference should they be injured themselves. MethodsA 20-item survey detailing surgical experience, diagnosis, surgical management preference and a series of case studies was conducted. The survey was endorsed and promoted by the Australian Orthopaedic Association (AOA). Results125 responses were received during the three-month study period. The most commonly used method to stabilise a syndesmotic injury by Australian orthopaedic surgeons was two 3.5 mm screws (26.4%), closely followed by one suture-button (23.2%). Overall, 44% of surgeons employ a dynamic stabilisation method and 54.4% a static stabilisation method. Half of surgeons recommend routine removal of syndesmosis screws, and surgeons tend to use two devices for high Weber C fractures. One third of surgeons who most commonly use screws in their practice would actually prefer a suture-button for management of their own syndesmosis injury. ConclusionSignificant variability remains in the management of syndesmosis injuries. This survey of Australian orthopaedic surgeons reveals higher suture-button device use when compared to other countries.

Effectiveness of a Superelastic Nitinol Device for Fixation of Syndesmosis in Ankle Fracture

Category:Ankle; TraumaIntroduction/Purpose:Syndesmosis injuries are increasingly common. Available fixation options are not yet optimal. The PUMA System (Panther Orthopedics, Sunnyvale, CA) is an FDA-cleared superelastic, nitinol-based fixation device for the ankle syndesmosis which provides stabilization without over-compression or loosening during cyclical loading. The spring-like design of the PUMA System allows physiological micro-motion while maintaining continuous compression and resisting syndesmosis widening, without material creep. The objective of this prospective study is to assess the effectiveness and complication rate of the PUMA device for treatment of fracture-associated syndesmosis injuries.Methods:We prospectively collected radiographic and clinical data on 32 consecutive patients treated for fracture-associated syndesmotic disruption with the PUMA SystemTM at 8 centers. Primary outcome measures included adverse event rates, radiographic evaluations for syndesmosis integrity and implant failure, and rates of revision surgery.Results:All 32 patients had successful repair of their ankle syndesmosis (Figure 1). The mean age of patients at time of operation was 42 years (range 16- 68). There were 13 females (13/32, 40.6%) and 19 (19/32, 59.4%) males. Postoperative radiographic evaluations confirmed satisfactory syndesmosis healing with maintained reduction in the ankle mortise in 33/33 (100%) ankles. There was no evidence of lysis, device migration or syndesmotic or medial clear space widening. There were no infections or soft tissue complications. All fractures healed. No devices required removal and there were no revision surgeries.Conclusion:The PUMA SystemTM provides physiologic stabilization of the syndesmosis due to the design features that allow for continuous compression without creep. We found no device-related complications nor construct failures in our series. The superelastic implant design allows physiologic motion at the syndesmosis but does not creep or stretch following displacement. This flexibility obviates the need for routine removal. The implant's low-profile buttons without suture and knot tying requirements eliminate the concern for subcutaneous knot irritation and slippage. Additional biomechanical and clinical outcomes study of this device may further optimize rehabilitation protocols for patients treated for syndesmotic injury.

Suture Tape Reinforcement Device as an Independent Fixation Solution for Partial Syndesmosis Injuries

Category:Ankle; Arthroscopy; Basic Sciences/Biologics; SportsIntroduction/Purpose:A suture tape reinforcement device is designed for repair of syndesmotic injury. Its insertion in the fibular and tibial footprints of the anterior inferior tibiofibular ligament (AITFL) promises a dynamic constraint to external rotation, antero-posterior translation of fibula and diastasis of the syndesmosis in the coronal plane.We hypothesized that following fixation of transected syndesmosis with suture tape reinforcement, syndesmotic stability becomes similar to that of an intact syndesmosis.Methods:Fifteen non-paired fresh frozen cadaveric specimens amputated above the knee were included in this study. Assessment of the ankle syndesmosis was performed in six stages; 1) with all syndesmosis ligaments intact; 2) after transection of the AITFL, 3) the interosseous ligament, 4) subsequent fixation with suture tape reinforcement device, 5) transection of the posterior inferior syndesmotic ligament, and 6) after removal of the suture tape reinforcement device (complete ligament transection stage).Instability measurements included anterior and posterior tibiofibular spaces measured arthroscopically under 100N lateral stress using a bone hook, tibiofibular anteroposterior and posteroanterior translation in sagittal plane measured arthroscopically under sagittal stress of 100N, and anterior tibiofibular space measured directly with a caliper under external rotation torque of 7.5 Nm. Instability measurements taken after each fixation method were compared with the intact stage and to the complete ligament transection stage using the Wilcoxon signed-rank test.Results:The suture tape reinforcement device was able to stabilize an AITFL- and the interosseous ligament-transected stage, similar to the intact stage, with respect to all measures of instability. As for the complete ligament transection stage, after suture tape reinforcement it remained unstable in the coronal plane, compared to the intact stage: there was an increase in anterior tibiofibular space without stress (1.7 mm vs 1.1 mm, p=0.005) and with stress (1.8 mm vs 1.1 mm, p=0.007), as well as in posterior tibiofibular space with stress (2.8 mm vs 1.6 mm, p=0.002).Conclusion:Our findings suggest that suture tape reinforcement device might be effective for fixation of partial syndesmotic injury, but not for complete syndesmotic injury. Future clinical research is needed to confirm this.

Cyclic Fatigue and Creep Resistance Testing of the PUMA SystemTM

Category:Ankle; Basic Sciences/Biologics; TraumaIntroduction/Purpose:The PUMA System (Panther Orthopedics, Sunnyvale, CA) is an FDA cleared. superelastic, nitinol based fixation device for the ankle syndesmosis which provides stabilization without over-compression or loosening due to creep from cyclic loading. Objective The objective of this study was to test resistance to lengthening (creep) of the PUMA System in cyclic fatigue testing.Methods:Five PUMA System devices, each having a nitinol Body consisting of six layers, were cycle-tested between 20/40 pounds per cubic foot (lb/ft3) polyurethane foam Bone Blocks (Figure 1).[1] The PUMA System devices were set up with an initial device Active Length of approximately 66 millimeters (mm) between their polyether ether ketone (PEEK) Anchor buttons. All devices were tightened to a minimum of 11.1 Newtons (2.5 pounds force) and cycled at 5 cycles per second (5 Hz) for 4500 cycles to 2.4 mm displacement. Device Active Length was recorded pre- and post-testing. Devices were visually inspected for any break in the 30 nitinol layers. [1] ASTM F1839: Standard Specification for Rigid Polyurethane Foam for Use as a Standard Material for Testing Orthopedic Devices and Instruments.Results:None of the 30 layers incorporated in the 5 PUMA SystemTM device Bodies failed due to cyclic fatigue. Also, there was little-to-no difference between pre- and post-testing Active Length (Figure 2). More specifically an average increase of only 0.2% in length with a with a Standard Deviation of 0.16% evidences no significant creep (Table 1).Conclusion:The PUMA SystemTM allows for ankle syndesmosis repair with an implant that experiences no significant creep as demonstrated in cyclic-fatigue testing under challenging displacement cycle testing.

Radiographic Evaluation of the Normal Distal Tibiofibular Syndesmosis in Neutral to Dorsiflexion on Weight-Bearing

Category:Ankle; SportsIntroduction/Purpose:Reliable landmarks of ankle syndesmosis change in various position is important for managing ankle injury. The purpose of our study was to investigate and compare radiographic landmarks of normal ankle in various positions.Methods:The study involved both ankle radiographs of 30 subjects (15 males, 15 females) without clinical or radiographic abnormality. Tibiofibular clear space (TFCS) and tibiofibular overlap (TFO) were measured on anteroposterior (AP) and mortise radiographs in non-standing (NS) and standing (S) neutral and dorsiflexion 10 (DF10) and 20 degrees (DF20). The radiographic measurements were used to calculate means, standard deviations, and intra- and interobserver reliabilities, and compare TFCS and TFO in various positions and genders.Results:On the AP view, the mean TFCS in NS, S, DF10, and DF20 positions were 4.00+-0.97, 4.00+-0.83, 4.35+-0.95, and 4.45+-0.89 and the mean TFO on the same positions were 6.58+-2.27, 4.27+-1.90, 3.44+-1.96, and 2.38+-1.91. On the mortise view, the mean TFCS in NS, DF10, and DF20 positions were 3.62+-0.88, 4.08+-0.86, and 3.88+-0.97 and the mean TFO on the same positions were 3.57+-2.13, 2.31+-1.77, and 3.57+-2.14. The reliabilities in all positions except TFCS on some positions were excellent. No measurement was significantly different between females and males except TFO in NS on mortise view (p=0.006) and DF10 on AP view (p=0.032).Conclusion:Increase of TFCS and decrease of TFO on AP view reflects syndesmosis change from non-standing to DF20 on standing. Clinically, Effect of weight-bearing and reliability of TFO should be considered.

Elite Athletes Successfully Return to the Preinjury Level of Sport Following Ankle Syndesmosis Injuries: Systematic Review and Meta-Analysis

Category:Sports; AnkleIntroduction/Purpose:No meta-analysis has been conducted to examine the clinical outcomes following operative and nonoperative management of high ankle sprain injuries in elite athletes. the purpose of this systematic review was (1) To report the rate and time to return to sport (RTS) following high ankle syndesmotic injury in elite athletes (2) To examine the rate and time of RTS as well as the postoperative complications in elite athletes who underwent surgical treatment of high ankle syndesmotic injury with screw versus suture button fixation.Methods:Three electronic databases were searched for eligible articles. Two reviewers independently screened the titles, abstract and full-text articles using pre-specified criteria. Eligible articles were those that reported the rate of return to sport following operative and nonoperative treatment of ankle syndesmotic injuries in elite athletes (collegiate or professional level). Data collected were type of sport, type of treatment received (operative versus nonoperative), surgical technique (screw versus suture button fixation), rate and time to return to the preinjury level of competition, and complications. A random-effects model was used for meta-analysis.Results:The estimated overall rate of RTS was 99% (95% CI 95.5-99.9). The mean time to RTS was 38 +- 18 (range: 14-137) days. Of the 440 athletes, 269 (269/440,61%) were treated nonoperatively (nonoperative group); the rate of RTS was 99.6% and the athletes returned at a mean time of 29+-14 (range: 13-45) days. A total of 171 athletes (171/440,39%) underwent surgical treatment (operative group); All (171/171,100%) athletes returned at a mean time of 50.3+-13 (range:41-137) days. Almost all athletes who underwent surgery had suture button fixation (164/171 athletes,96%) and the mean time to RTS was 7 weeks with 9.1% complication rate.Conclusion:Elite athletes with ankle syndesmosis injury return to sport at an extremely high rates, following operative or nonoperative treatment. Suture button fixation remains the gold standard technique in elite athletes with syndesmotic injury requiring surgical treatment. Return to the preinjury level of competition should be expected at 4 weeks and 7 weeks in high-level athletes who undergo nonoperative and operative management, respectively.

The treatment for chronic Maisonneuve fracture with ankle syndesmosis injury by using suture-button

The treatment for chronic Maisonneuve fracture with ankle syndesmosis injury by using suture-button

High Ankle Syndesmosis Disruption: All-Inside Arthroscopic Reduction and Internal Fixation

Ankle syndesmotic injury, or high ankle sprain, has been shown to lead to chronic injury and long-term debilitation when undertreated or malreduced. Arthroscopic repair of ankle syndesmosis injury provides a novel therapeutic avenue to achieve adequate reduction and fixation of ankle syndesmosis injury while preventing unnecessary soft tissue trauma and shortening time to return to sport. We describe and illustrate one academic institution’s technique of arthroscopic repair of ankle syndesmosis injury as well as the benefits and pitfalls of such an approach. Syndesmosis arthroscopic reduction and internal fixation is a novel strategy addressing diagnosis and fixation while minimizing soft tissue disruption and allowing early return to activity. It allows direct visualization of a dynamic exam, enhancing the surgeon’s ability to accurately identify the injury pattern. Following diagnosis, the syndesmosis reduction maneuver and fixation are directly monitored arthroscopically helping to prevent iatrogenic malreduction, as the syndesmosis remains visible throughout. The addition of an all-inside anterior-inferior talofibular ligament reconstruction can augment syndesmosis stability if necessary. Level of Evidence: Diagnostic Level V. See Instructions for Authors for a complete description of levels of evidence.

The use of intraoperative comparative fluoroscopy allows for assessing sagittal reduction and predicting syndesmosis reduction in ankle fractures

Intraoperative fluoroscopic parameters have shown to be poor predictors for ankle syndesmosis reduction, with up to 52% of syndesmotic malreduction (SMR) reported in the literature. Anteroposterior Tibio-Fibular index (APTF) was previously described to evaluate sagittal tibiofibular alignment in lateral ankle radiographs with a high correlation between both ankles in uninjured subjects. Reproducible intraoperative measurements for sagittal syndesmotic reduction are lacking. We propose the use of the “cAPTF,” calculated as the absolute difference between the APTF of the non-injured and the operated ankle, to evaluate sagittal syndesmotic reduction. ObjectiveDetermine the predictive capability of cAPTF for SMR. MethodProspective observational study. Inclusion criteria: patients with unstable ankle fractures requiring syndesmotic fixation, with a healthy contralateral ankle. Intraoperatively APTF was measured in both ankles after syndesmotic fixation. Postoperatively cAPTF was calculated. Only direct syndesmosis visualization through the lateral approach and AP and mortise views were used by surgeons to assess syndesmotic reduction. Quality of syndesmotic reduction was evaluated with bilateral postoperative CT. To estimate cAPTF discriminatory power for SMR, a receiver operative characteristic (ROC) curve was obtained and the area under the ROC curve was calculated. Youden index was used to determine the ideal cAPTF cut-off value for predicting SMR. For this determined cut-off value, sensitivity, specificity, and likelihood ratio were calculated. ResultsFifty-two patients were included. Sixteen (30%) had SMR. Patients with SMR had a statistically significant higher cAPTF value than the well reduced (median 0.26 vs 0.09; P < 0.01). The cAPTF cut-off value to predict SMR was 0.161. A cAPTF greater than 0.161 had 100% sensitivity and 97,2% specificity for SMR. The area under the ROC curve was 0.99. ConclusionIntraoperative cAPTF has excellent discriminatory power for predicting syndesmotic malreduction. We propose the routine use of intraoperative bilateral comparative fluoroscopy to assess sagittal syndesmotic reduction.

Suture Anchor Augmentation for Acute Unstable Isolated Ankle Syndesmosis Disruption in Athletes.

Isolated ankle syndesmosis disruption (without fibula fracture) causes acute pain and may cause chronic instability and pain. The aim of the present study was to evaluate the outcomes after anterior inferior tibiofibular ligament (AITFL) anatomical fixation using anchor sutures for unstable isolated syndesmosis disruption without fibular fractures. This study assessed 22 athletes who were diagnosed with unstable isolated syndesmosis disruption with a positive external rotation test, had more than 2-mm diastasis on ultrasound, and had complete AITFL rupture on magnetic resonance imaging between 2004 and 2020. Eighteen patients (82%) were elite-level athletes, and the remaining 4 were recreational athletes. Twelve patients (55%) were injured by an external rotation force. The athletes underwent open anatomical suture anchor fixation between the AITFL attachment sites, the fibula and tibia. The mechanism of injury, return-to-play time, and Foot and Ankle Outcome Score (FAOS) were evaluated. All athletes returned to previous play except 1 retired elite athlete. Twenty-two athletes returned to jogging, team training, and official game play at an average of 62, 89, and 102 days, respectively. The final average follow-up FAOS symptom, pain, daily activity, sports activity, and quality of life scores were 98, 97, 100, 99, and 97, respectively. Two athletes were reinjured, and 1 required reoperation in the follow-up period. Athletes with isolated syndesmosis disruption had a high likelihood to return to their previous activity level after suture anchor augmentation. Level IV, case series.

Syndesmosis Repair Affects in Vivo Distal Interosseous Tibiofibular Ligament Elongation Under Static Loads and During Dynamic Activities.

Ligamentous ankle injuries are the most common injuries sustained by athletes and by the general population, with an incidence of approximately 2 million per year in the U.S. Injuries to the ankle syndesmosis (i.e., "high ankle sprains") are generally treated operatively. Although cadaveric studies can evaluate syndesmosis fixation strength, they cannot predict how healing, neuromuscular adaptation, or dynamic loading will affect in vivo biomechanics. Using dynamic biplane radiography (DBR), we tested the hypothesis that syndesmosis repair would restore ankle kinematics and ligament elongation during static and dynamic loading. A convenience sample of 6 male patients who had undergone fixation (2 screw, 3 suspensory, 1 hybrid) of syndesmosis injury were assessed with use of DBR during forward running, backpedaling, a 45° angled single-leg hop, and 1 static standing trial at 2 to 4.5 years postoperatively. Three-dimensional ankle kinematics and elongation of the distal interosseous ligament, anterior inferior tibiofibular ligament, and the posterior inferior tibiofibular ligament were measured bilaterally. Comparisons were made between the operative and uninjured sides. Clinical outcomes were evaluated with use of the Foot and Ankle Ability Measure. Static load increased the lengths of the distal interosseous ligament (p = 0.02 to 0.05) and middle segment of the anterior inferior tibiofibular ligament (p = 0.02) in the operative ankle. The distal syndesmosis length was greater on the operative side during the static unloaded and loaded conditions (p = 0.02). Length of the distal syndesmosis on the operative side was greater than the corresponding healthy syndesmosis length during all 3 dynamic activities. On average, the operative ankle was in less dorsiflexion over the support phase of the angled hop (p = 0.05) and running (p < 0.01). The average Foot and Ankle Ability Measure Activities of Daily Living and Sports subscale scores were 95 and 88, respectively. This study provides the first in vivo evidence of post-fixation changes in biomechanics after syndesmosis repair. Syndesmosis repair fails to restore healthy static and dynamic distal tibiofibular anatomy, even in patients who report good to excellent clinical outcomes. Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Pediatric versus adult magnetic resonance imaging patterns in acute high ankle sprains.

There is a paucity of literature describing MRI patterns of high ankle sprains in pediatric patients. Radiologists should understand MRI patterns of these injuries in both adults and children. To describe normal MRI appearance of pediatric syndesmotic ligaments and compare MRI patterns of high ankle sprains in children versus adults. We reviewed consecutive ankle MRIs performed over 3years and divided them into three cohorts: a normal pediatric (≤16years) cohort, and pediatric and adult cohorts with acute/subacute ankle syndesmosis injuries. Our retrospective review assessed interobserver agreement (Cohen kappa coefficient) and normal pediatric syndesmotic anatomy. We compared patterns of high ankle sprains (Fisher exact test) including ligament tears, periosteal stripping, avulsions and fractures. Of the 582 ankle MRIs, we included 25 in the normal pediatric cohort, 20 in the pediatric injury cohort and 23 in the adult injury cohort. The anterior and posterior tibiofibular ligaments all attached to cortex or cartilaginous precursor, while the interosseous ligament/membrane complex attached to the fibrous periosteum in 22/25 (88%) normal pediatric cases. Tibial periosteal stripping at the interosseous ligament/membrane complex attachment occurred in 7/20 (35%) pediatric and 1/23 (4%) adult injury cases (P=0.02). No other statistically significant differences were found. Interobserver agreement ranged from kappa=0.46 to kappa=0.82 (ligament tears), 0.38 to 0.45 (avulsions) and 0.69 to 0.77 (periosteal stripping). The normal interosseous ligament/membrane complex typically attaches to fibrous periosteum rather than bony cortex. Tibial periosteal stripping, usually without tibial fracture, is significantly more common among pediatric high ankle sprains. MRI patterns of high ankle sprains are otherwise not significantly different between children and adults.

Limited intrarater and interrater reliability of acute ligamentous ankle injuries on 3 T MRI

ObjectivesTo determine the diagnostic reliability of the Schneck grading system for acute ligamentous injuries of (1) the three major ligamentous ankle complexes, (2) the individual ankle ligaments and (3) the Sikka classification for syndesmosis injury.MethodsAll acute ankle injuries in adult athletes (≥18 years), presenting to the outpatient department of a specialised Orthopaedic and Sports Medicine Hospital, within 7 days postinjury were screened for inclusion. Ankle injuries were excluded if imaging demonstrated a frank ankle fracture or if the 3 T MRI study could not be acquired within 10 days postinjury. Two radiologists graded the three major ligamentous complexes (lateral ankle complex, deltoid complex and syndesmosis complex) and their comprising individual ligaments according the four-grade Schneck grading system. Syndesmotic injuries were classified according the four-grade Sikka classification for consequent injury of the individual syndesmosis ligaments and the deltoid complex. Agreement and kappa (K) statistics were calculated to determine intrarater and interrater reliability.ResultsBetween September 2016 and September 2018, a total of 92 MR scans were obtained (87 patients). Interrater and intrarater reliability of the Schneck grading system was moderate to substantial for the lateral ankle complex (K=0.47–0.76), fair to almost perfect for the syndesmosis complex (K=0.37–0.89) and fair to moderate for the deltoid complex (K=0.14–0.51). For the individual ligaments, kappa values ranged from moderate to substantial for the anterior talofibular ligament (ATFL) (K=0.55–0.73), fair to substantial for the calcaneofibular ligament (K=0.31–0.62) and fair to almost perfect for the anteroinferior tibiofibular ligament (AITFL) (K=0.36–0.89). Diagnostic reliability of the Sikka classification ranged from moderate to almost perfect (K=0.51–0.95).ConclusionsGrading of the three major ligamentous complexes and of the individual ankle ligaments according the Schneck grading system resulted in limited diagnostic reliability. When dichotomised for the presence of complete discontinuity, the interrater reliability of the Schneck grading system improved to substantial and almost perfect for the ATFL and AITFL, respectively. Classification of syndesmosis injury according the Sikka classification resulted in moderate interrater reliability.

The effect of the ankle syndesmosis reduction quality on the short-term functional outcome following ankle fractures

IntroductionA few radiographic techniques have been proposed to evaluate ankle syndesmosis reduction. The purpose of this study was to analyze post-operatively with CT-scanning the quality of ankle syndesmotic reduction. Moreover, to assess the impact of quality of syndesmotic reduction to functional outcome. Materials and methodsA prospective cohort study focused on patients older than 17 years with lateral and medial malleolar fracture with verified syndesmotic disruption. Exclusion criteriaopen fracture, concomitant injury, surgery delayed for more than 24 hours, additional posterior malleolar fracture, ASA score of ≥ 3, complication requiring revision surgery, articular step or gap of ≥ 2mm on the postoperative CT scans. ResultsOut of 41 patients, 34 participants completed the follow-up. There was a male predominance (20 patients – 58.82%) and the mean age was 48.46±16.1 years (range (20-72 years). 22 patients (64.71%) have sustained type B fracture, while in 12 patients (35.29%) the fracture was of a type C. The reduction was classified as anatomical in 26 patients (76.50%), while in 8 patients (23.50%) the reduction of the syndesmosis was non-anatomical. In those 26 patients in whom the reduction was anatomical, 17 (65.39%) were males and there were 18 (66.67%) type B fractures. In the patients with non-anatomical reduction, 3 patients (37.5%) were of a male gender and there was the equal number of type B and C fractures. The statistical analysis showed significantly favorable scores for both AOFAS score and VAS scale for the patients with anatomical reduction. ConclusionFunctional analysis showed a strong association with the CT observed reduction quality and both the AOFAS score and VAS scale. Further studies are desirable to provide further evidence in relation to the findings of this study.

Radiologic Assessment for Evaluating the Post-operative Reduction of Syndesmosis: A Retrospective Study

Background: Assessing the reduction of syndesmosis is highly recommended due to the complications occurring after the malreduction of the syndesmosis. This study evaluated the post-operative Computed Tomography (CT) scans and standard plain radiographs for assessing the reduction of syndesmosis post-operatively. Objectives: Evaluating the radiologic assessments of post-operative reduction of syndesmosis. Methods: In this retrospective cohort study, 45 patients presented with ankle fractures and syndesmosis failure to the emergency department of our hospital between 2015 and 2019 were evaluated by post-operative CT scans and plain radiographs. Results: Diastasis was demonstrated in 18 patients (40%) in plain radiographs, in 4 patients (8%) by tibial clear space, in 5 patients (11%) by medial clear space, in 10 patients (22%) by AP tibiofibular overlap, and in patients 8 (17%) by mortise tibiofibular overlap. Diastasis was demonstrated in 24 patients (53%) in CT scans, of whom 18 patients had abnormal radiographic parameters, while 6 patients had normal radiographic parameters. Conclusion: We found a post-operative CT scan more useful than standard plain radiographic measurement for assessing the reduction of the syndesmosis. We suggest the use of post-operative CT scan as a routine to evaluate the syndesmosis reduction.

Adjustable Cortical Fixation Device for Quadriceps Tendon Repair: A Cadaveric Biomechanical Study.

Background:Adjustable cortical fixation devices have demonstrated utility in orthopaedic applications, such as ankle syndesmosis repair.Purpose:To assess the cyclic gap formation of a quadriceps tendon repair technique using an adjustable cortical fixation device compared with repair with knotless suture anchors and suture tape, a modification of conventional suture anchor repair.Study Design:Controlled laboratory study.Methods:Eight fresh-frozen matched pairs of cadaveric knees were used. Specimens in each pair were randomized to undergo either modified suture anchor repair (control) or adjustable cortical fixation repair. The control repair was performed as previously described. The experimental repair was performed using 2 No. 2 FiberWire sutures placed into the quadriceps tendon in a running locked Krackow configuration and 2 adjustable loop devices passed through transosseous tunnels. The lagging strands of the devices were tensioned to seat the cortical fixation buttons at the inferior patellar pole and then tied to the free Krackow strands at the superior pole to complete the repair. The mean plastic gap (permanent tendon displacement that did not recover with cyclic extension) and mean maximum gap (peak displacement that occurred with cyclic knee flexion and partially recovered with extension) were evaluated during cyclic loading for 500 cycles of full knee extension to 90° of flexion.Results:At all testing intervals, the mean plastic gap was significantly smaller for the cortical fixation group versus the suture anchor group (P < .02). Similarly, the mean maximum gap was significantly smaller for the cortical fixation specimens at all testing intervals (P < .01). After cyclic loading, the mean maximum gap was significantly smaller in the cortical fixation group (4.80 ± 1.56 mm) versus the suture anchor group (8.47 ± 1.47 mm; P = < .001). The mean plastic gap was also significantly smaller in the cortical fixation versus the suture anchor group (3.25 ± 1.10 mm vs 6.57 ± 1.62 mm, respectively; P = < .001).Conclusion:Quadriceps tendon repair using an adjustable cortical fixation device demonstrated superior biomechanical properties in cyclic displacement testing compared with repair using the suture anchor technique.Clinical Relevance:These results suggest that an adjustable cortical fixation device is a biomechanically viable alternative for quadriceps tendon repair.

The Effect of “High-ankle Sprain” Taping on Ankle Syndesmosis Congruity: A Cadaveric Study

Background: Different treatment options exist for dynamically unstable purely ligamentous syndesmotic injury, including surgery, walking boot, brace and taping. Objective: The main purpose of this study was to evaluate the effect of high-ankle sprain taping (ring taping) on syndesmotic stability in various ligament conditions when axial loading is applied. Methods: This controlled cadaveric laboratory study included ten cadaveric specimens installed in a custom-made device applying 750N of axial loading in order to simulate weight-bearing. Sectioning of syndesmotic ligaments, AiTFL and IOL, was done sequentially and CT scan images were taken with and without high-ankle sprain taping. A validated measurement system consisting of 3 lengths and 1 angle was used. Results were compared with Wilcoxon tests for paired samples and non-parametric data. Results: In every ligament condition (intact vs. cut), no statistically significant difference was observed between specimens, with or without high-ankle sprain taping and with or without axial loading. When the data from ankles with AiTFL and IOL ruptures were compared, the mean for length “b” without axial loading was 7.19 (±2.17), compared to 7.20 (±1.98) with axial loading (p-value = 0.905). With taping and the leg still in axial loading, the value was 7.17 (±2.09) (p-value = 0.721), which is not statistically significant. Conclusion: It is impossible to conclude regarding high-ankle sprain taping’s capacity to maintain syndesmosis congruity because no significant difference was observed, regardless of condition. The most important finding is that high-ankle sprain taping did not cause malreduction of the injured syndesmosis. Level of Evidence: Level V cadaveric study

Obesity and risk for open reduction and internal fixation of syndesmotic injuries in the setting of concomitant ankle fractures

IntroductionThe association between obesity and the need for open reduction and surgical fixation of the syndesmosis in the setting of malleolar ankle fractures remains to be elucidated. Therefore, the primary objective of this study was to assess the relationship between obesity, ankle fracture complexity, and the need for open reduction and fixation of the syndesmosis. MethodsA retrospective analysis of the NSQIP database was performed for patients undergoing surgical fixation of isolated, closed ankle fractures. Patients were grouped by fracture pattern into 6 cohorts (uni-, bi- and trimalleolar ankle fractures with or without syndesmotic injury). Demographic data was collected and compared between groups and logistic regression analyses were used to assess the relationship between body mass index (BMI) and ankle fracture pattern. ResultsA total of 15,841 patients (mean age 48.9 years) were identified for inclusion. Regression analyses revealed that BMI had a significant association with the incidence of open reduction and internal fixation of the ankle syndesmosis, but there was no association between BMI and malleolar fracture pattern. ConclusionsThis study demonstrates that elevated BMI is associated with an increased risk for open reduction and internal fixation of the syndesmosis in malleolar ankle fractures. However, obesity was not associated with ankle fracture pattern itself, whereas older age, female sex, and white race were more significant predictors of fracture complexity. This data provides a framework for further evaluation of the effect that both modifiable and non-modifiable risk factors have on fracture complexity and operative management of patients with such injuries. Level of evidenceCase-control study. Level III.