High Ankle Sprains Research Articles

CORR Insights®: Can Weightbearing Cone-beam CT Reliably Differentiate Between Stable and Unstable Syndesmotic Ankle Injuries? A Systematic Review and Meta-Analysis.

CORR Insights®: Can Weightbearing Cone-beam CT Reliably Differentiate Between Stable and Unstable Syndesmotic Ankle Injuries? A Systematic Review and Meta-Analysis.

Return to Play After Isolated Syndesmotic Ligamentous Injury in Athletes: A Systematic Review and Meta-analysis.

Background:Syndesmotic ankle sprains are common and challenging injuries for athletes. The management of such injuries is controversial, with a paucity of evidence on treatment protocols with unpredictability regarding the time lost to participate in sports following injury. The present study seeks to review and report the return to play (RTP) time and examine the outcomes and complications of ankle syndesmotic sprains in the athletic population.Methods:PubMed, Cochrane Library, and Google Scholar were queried in August 2021 for case series, cohorts, and randomized controlled trials that evaluated return to play time after ankle syndesmotic sprains. The primary outcomes were the rate and time to return to play after syndesmotic ankle sprains for both surgical and nonsurgical treatment. Secondary outcomes included short-term complications and recurrence.Results:Eighteen articles were eligible for meta-analysis with a total of 1133 syndesmotic sprains. The overall RTP was 99% (95% CI 0.96, 1.00), the overall mean RTP was 52.32 days (95% CI 39.01, 65.63). Pooled RTP for surgically treated patients was 70.94 days (95% CI 47.04, 94.85), whereas it was 39.33 days (95% CI 28.78, 49.88) for nonsurgically treated cases. A low incidence of recurrence and complications were reported.Conclusion:This article reports a high rate of RTP after syndesmotic sprains. Grade of injury and surgical vs conservative management can affect the time to RTP in high-level athletes.Level of Evidence: Level IV, systematic review and meta-analysis.

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.

Can Weightbearing Cone-beam CT Reliably Differentiate Between Stable and Unstable Syndesmotic Ankle Injuries? A Systematic Review and Meta-analysis.

Ankle injuries are common presentations to the emergency department and may lead to syndesmotic instability. These have a high socioeconomic burden due to prolonged rehabilitation, chronic pain, and posttraumatic arthritis. Early diagnosis is essential to minimize these complications, and the assessment of instability in the clinical setting is often limited by pain and clinician experience. Cross-sectional imaging of the distal syndesmosis accurately evaluates the syndesmosis through abnormal bony relationships, which in the presence of instability, worsens during physiological loading. Cone-beam CT (CBCT) has gained popularity in the diagnosis of these injuries because it enables syndesmotic assessment under weightbearing conditions, it mitigates the high radiation dose, and it is time-efficient. The purposes of this systematic review were: (1) to establish normal values for weightbearing CBCT of the syndesmosis in uninjured ankles and ascertain interobserver reliability and (2) to identify the impact of weightbearing on the syndesmosis in patients with occult ankle injuries and assess the effect of patient demographics on these metrics. This systematic review was reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and registered in PROSPERO (ID CRD42021248623). MEDLINE, PubMed, Embase, and Emcare databases were searched for studies assessing for syndesmotic instability, of which 307 studies were screened and 11 studies with 559 ankles in 408 uninjured patients and 151 patients with syndesmotic instability were included. All patients 18 years of age or older presenting with unilateral ankle injuries who underwent weightbearing CBCT for the diagnosis of an occult fracture or syndesmotic instability compared with the uninjured contralateral side were included. A control group of uninjured ankles was identified during weightbearing CBCT performed for other indications such as forefoot or midfoot injuries. Methodological assessment of the studies was performed using the Risk of Bias In Non-randomized Studies (ROBINS-1) tool and most included studies had a low risk of bias. Thus, a random-effects restricted maximum likelihood ratio model was used. In the uninjured ankle, the mean area of the tibiofibular syndesmosis was 112.5 ± 7.1 mm 2 , which increased to 157.5 ± 9.6 mm 2 after injury when compared with uninjured ankles with a standardized mean difference of 29.5 (95% confidence interval 19.5 to 39.5; p < 0.01), and an excellent interobserver agreement (κ = 1.0 [95% CI 0.9 to 1.0]). However, syndesmosis volume decreased with age (β = -0.76; p = 0.04), and therefore, has a negative association with increasing age. Our study has shown that the syndesmotic area is the most reliable parameter in the assessment of syndesmotic injuries because it increases in the presence of instability during weightbearing status. It is a composite measurement that could potentially allow clinicians to use weightbearing CBCT as an adjunct when there is a clinical suspicion of syndesmotic instability. Thus, weightbearing CBCT has the potential of being diagnostic of syndesmotic instability and should be evaluated against current radiological modalities to evaluate its accuracy. Level IV, prognostic study.

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.

29 Ankle Syndesmotic Injury: Tightrope vs Screw Fixation, a Clinical Academic Survey

Abstract Aim Unstable syndesmotic ankle injury requires surgical management in the form of screw or tightrope fixation. However, the superiority of one technique over the other remains debatable. Our Study aims to identify the fixation of choice in unstable ankle syndesmotic injury based on the surgeon’s level of experience. Methods A survey was undertaken to analyse the management of ankle syndesmotic injuries AO 44c in a 35-year-old patient. Surgeons attending an orthopaedic course were invited to participate in a survey categorised into groups: junior surgeons, middle grades and experienced. X-ray was shown to the 100 participants and treatment options were asked. Results 100 surgeons from 20 nations took part in the event. Juniors made up 39%, registrars 38% and experienced surgeons were 29%. 93% chose screw fixation, out of which 66% favoured a single screw over two screws. 3–4 cortices were virtually evenly divided in choice, with 54 % preferring three and 46% preferring four cortices. Only 22% of the time did they utilise a washer with screws. 52% of the surgeons allowed weight-bearing 4 to 6 weeks after surgery. 34% preferred to remove the screw at 1–2 months and 29% at 2–3 months post-operatively. Conclusions Data show that majority of junior level doctors manage their patients according to AO principles. The majority prefer one 3.5mm screw positioned between 2–4 cm above the ankle joint, with three cortices being somewhat preferred. Despite the lack of data to support one procedure, the majority of people remove their screws within 1 to 3 months.

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.

Defining Normal Values for Distal Tibiofibular Syndesmotic Space with and without External Rotation Stress: A Prospective Study with Volunteer Controls

Category:Ankle; SportsIntroduction/Purpose:The diagnosis and treatment of distal tibiofibular syndesmosis (DTFS) injury can be challenging, especially in cases of subtle instability that may be masked on two-dimensional conventional radiographs. Weightbearing computed tomography (WBCT) has recently emerged as a useful diagnostic tool allowing direct assessment of distal tibiofibular widening.Area measurements of the distal tibiofibular incisura assessed one centimeter proximal to the ankle joint have been proposed as an accurate diagnostic tool to differentiate stable and unstable DTFS, however the literature lacks information regarding normal DTFS area measurements in asymptomatic ankles. The purpose of the current study was to examine and report normal threshold values for DTFS area measurements in a cohort of healthy volunteers, assessing the ankles in natural weightbearing position and under external rotation stress.Methods:In this prospective study, we enrolled twenty-five healthy volunteers without a history of DTFS injury or high ankle sprain, previous foot and ankle surgery, or current ankle pain. Study participants underwent bilateral standing non-stress and external rotation stress WBCT scans. On non-stress WBCT scans, subjects stood with feet shoulder width apart in a natural, upright position with body weight evenly distributed. For external rotation stress images, patients were instructed to position their lower extremity in maximal internal rotation while the foot was held in a fixed plantigrade position. The DTFS area (mm2) was semi-automatically quantified on axial-plane WBCT images one centimeter proximal to the apex of the talar dome using dedicated software (Figure 1). Syndesmosis area values were compared between non-stressed and stressed ankles, as well as left and right ankles. Statistical analysis was performed utilizing independent t-tests/Wilcoxon analysis with statistical significance defined as p<0.05.Results:The study cohort consisted of 50 ankles in 25 patients (12 males, 48%) with a mean age of 28.7+9.3 years. In the unstressed ankle, the mean pooled DTFS area was determined to be 99.1+2.8 mm2. The mean syndesmosis area of unstressed left ankles in the cohort was 96.5+4.0 mm2, while unstressed right ankles had a mean area of 101.6 mm2 (p=0.378). With external rotation stress, the DTFS area of left ankles (mean difference 1.2 mm2; CI: -9.8-11.8; p=0.765), right ankles (mean difference -3.1 mm2; CI: -16.1-6.6; p=0.453), and all ankles (mean difference -1.2 mm2; CI: -12.4-9.3; p=0.775) remained similar.Conclusion:This is the first study to assess standing WBCT DTFS area measurements in a cohort of volunteer controls, with and without external rotation stress. We found a mean DTFS value of 99+-18.8 mm2. We also observed that in normal ankles with expected intact ligaments, external rotation stress did not result in significant widening of the DTFS space. Our hope is that the results of this study can be utilized in the literature as normal threshold values for DTFS area measurements, fostering additional investigations of patients with suspected and confirmed DTFS instability.

Comparison of Suture-Button Fixation with Suture-Tape Augmentation and Trans-Syndesmotic Screw Fixation for Syndemosis Injury: A Biomechanical Study

Category:Ankle; Basic Sciences/BiologicsIntroduction/Purpose:The treatment of syndesmotic injuries with ankle fractures is controversial. The purpose of this study was to compare the biomechanical properties of suture-button fixation with suture-tape augmentation with those of screw fixation.Methods:Ten matched pairs of human cadaver specimens were subjected to suture-button fixation with suture-tape augmentation or screw fixation. Each specimen underwent initial intact physiologic loading, consisting of 10 cycles of axial loading with peak of 750N, 10 cycles of external torsional loading with peak of 7.5Nm, and 10 cycles of combined axial and external torsional loading with peak of 750N and 7.5Nm at 0.05 Hz. Injuries of the anterior inferior tibiofibular ligament, tibiofibular interosseous membrane, posterior tibiofibular ligament and medial malleolar fracture were applied to each specimen. Postfixation cyclic loading consisted of 50 cycles of combinedaxial and external rotation loading with peak torques of 750 N and 7.5 Nm at a rate of 0.05 Hz. After postfixation loading, each specimen underwent failure loading by external rotation at 0.25 degrees/second. Failure torque and failure angle were measured.Results:Mean failure torques were 15.99 +- 8.88 Nm in the suture-button fixation with suture-tape augmentation and 17.10 +- 10.38 Nm in the screw group. There was no significant difference in average failure torque between two groups (p-value = 0.669)Average failure angle in screw-fixation group (39.37 +- 10.19 deg) was significantly lower than average failure angle suture- button fixation with suture-tape augmentation (56.64 +- 9.64 deg) (p-value = 0.001).Average rotational stiffness in screw-fixation group (0.53 +- 0.24 Nm/deg) was significantly higher than average rotational stiffness in suture-button fixation with suture-tape augmentation group (0.35 +- 0.19 Nm/deg) (p-value = 0.033).Conclusion:Suture-button fixation with suture-tape augmentation for ankle syndesmotic injury provides similar torsional strength to that of screw fixation and has lower stiffness than screw fixation. Therefore, Suture-button fixation with suture-tape augmentation can be considered as an alternative treatment option for syndesmosis injury.

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.

Syndesmosis Injury

Isolated syndesmotic injuries, or high ankle sprains, are relatively common in the general population. However, the rate of injury is almost double when analyzing athletes who participate in high impact sports. In this chapter, we aim to provide a framework for clinicians to utilize when approaching the workup for a syndesmotic injury. We review topics of syndesmotic anatomy, pertinent history and physical examination findings, imaging, classification systems and various management techniques. Finally, we discuss the current outcomes data for both non-operative and operative management.

Short-Term Effect of Manual Therapy & Taping on Subacute Ankle Sprains with Potential Syndesmotic Sprain: A Case Series

ABSTRACT Study Design Case Series Background Syndesmotic ankle sprains can occur in up to 17% of ankle trauma and can lead to long-term disability. This study describes the management of seven patients with subacute, high-grade ankle sprains with concerns of concurrent syndesmotic strain utilizing manual therapy and rigid sports taping. Methods Seven active duty military members with clinically diagnosed, high-grade ankle sprains and concern for syndesmotic sprain participated in this case series. All patients received multi-modal treatment consisting of manual therapy, rigid sports taping, progressive exercises, and proprioceptive training. Decrease in Numeric Pain Rating Scale (NPRS) following manual therapy and taping treatment, number of sessions before discharge, and the Global Rating of Change (GROC) at discharge were retrospectively reviewed. Results All patients demonstrated an immediate decrease in NPRS following treatment on average of 5 points (range, 3–8 points) with a functional asterisk sign. The improvement in pain and function was maintained until the next treatment session with a mean GROC score of +3. The mean time until recovery was 5.4 weeks (range, 1–8 weeks). Discussion A multimodal approach for patients diagnosed clinically with high-grade ankle sprains and concern for syndesmotic sprain was useful to immediately reduce pain and improve function, and improvements were maintained throughout the duration of care. This study is the first to assess a combination of manual therapy and rigid sports taping for the treatment of suspected syndesmotic ankle sprains, and more stringent research is needed to validate the findings. Level of Evidence Therapy, 4

Diagnosis and Treatment of Syndesmotic Unstable Injuries: Where We Are Now and Where We Are Headed.

Up to 10% of ankle sprains are considered "high ankle" sprains with associated syndesmotic injury. Initial diagnosis of syndesmotic injury is based on physical examination, but further evaluation of the distal tibiofibular joint in the sagittal, coronal, and rotational planes is necessary to determine instability. Imaging modalities including weight-bearing CT and ultrasonography allow a physiologic and dynamic assessment of the syndesmosis. These modalities in turn provide the clinician useful information in two and three dimensions to identify and consequently treat syndesmotic instability, especially when subtle. Because there is notable variability in the shape of the incisura between individuals, contralateral comparison with the uninjured ankle as an optimal internal control is advised. Once syndesmotic instability is identified, surgical treatment is recommended. Several fixation methods have been described, but the foremost aspect is to achieve an anatomic reduction. Identifying any associated injuries and characteristics of the syndesmotic instability will lead to the appropriate treatment that restores the anatomy and stability of the distal tibiofibular joint.

Functional outcomes of unstable ankle fractures with and without syndesmotic fixation in the adolescent population.

PurposeThe purpose of this study was to compare functional outcomes of adolescents with and without ankle syndesmotic injuries and identify predictors of functional outcome after operative ankle fractures.MethodsA retrospective review was conducted on operative adolescent ankle fractures treated between 2009 and 2019 with a minimum of one-year follow-up (mean 4.35 years). Patients who underwent syndesmotic fixation (SF) (n = 48) were compared with operative ankle fractures without syndesmotic injury (n = 63). Functional outcomes were assessed using standardized questionnaires, specifically the Foot and Ankle Ability Measure (FAAM) and Single Assessment Numerical Evaluation.ResultsThere were no differences in patient-reported outcomes, rates of return to sport or complications between groups with and without SF. The SF group had a longer tourniquet time (p = 0.04), duration of non-weight-bearing (p = 0.01), more Weber C fibula fractures (p < 0.001), fewer medial malleolus fractures (p = 0.03) and more frequently underwent implant removal (p < 0.0001). Male sex, lower body mass index (BMI) and longer duration of follow-up were significant predictors of a higher FAAM sports score using multivariable linear regression. SF was not a predictor of functional outcome.ConclusionThis study demonstrated that patients that undergo surgical fixation of syndesmotic injuries have equivalent functional outcomes compared to operative ankle fractures without intraoperative evidence of syndesmotic injury. We also identified that male sex, lower BMI and longer duration of follow-up are predictors of a good functional outcome.Level of EvidenceIII

Dual Suture Button Fixation With Buttress Plate for Ankle Syndesmotic Injury.

In this video, we present a unique approach to a purely ligamentous syndesmotic injury in a 16-year-old football player. Syndesmotic reduction was obtained using a large clamp and validated by matching fibular position to a fluoroscopic image of the contralateral ankle. Fixation was achieved using dual suture button devices in combination with a buttress plate. A small medial incision was used to protect the saphenous neurovascular bundle during button placement.

PEDIATRIC SPORTS INJURY EPIDEMIOLOGY DURING COVID-19 PANDEMIC

Background:The COVID-19 pandemic has prompted a multitude of public health response measures including social distancing, school cancellations, and cessation of organized sports. A change in the epidemiology of injuries commonly caused by sporting activities is expected.Hypothesis/Purpose:Examine the effect of public health measures on the incidence and characteristics of common pediatric sports injuries.Methods:This is a retrospective cohort study comparing sporting injuries presenting to a level I pediatric trauma hospital during the COVID-19 pandemic to sporting injuries during a pre-pandemic period at the same institution. Nine specific injury types were evaluated including ACL injury, meniscus injury, patellar dislocation, osteochondritis dissecans (OCD), shoulder dislocation, ankle sprain, clavicle fracture, medial epicondyle fracture, and tibial spine fracture. Patients were included if they presented for initial care between 3/15/20 and 4/15/20 for the “pandemic” group and the same time window in 2018 and 2019 for the “pre-pandemic” group.Results:487 patients were included in our study with an average of 222.5 patients in 2018 and 2019 compared to 42 patients in 2020. The average patient age decreased during the pandemic compared to the pre-pandemic period (9.4 ± 6.0 vs 12.4 ± 4.2, p=0.007). Additionally, a decrease in the proportion of injuries attributed to sports (26.2% vs 47.6%, p=0.005) and those occurring at school/daycare (4.8% vs 10.3%, p<0.001) were observed. During the pandemic there was an increase in the proportion of injuries occurring at the patients home (50.0% vs 16.9%, p<0.001)(Table 1). The distribution was significantly different across the nine injury types included with a decrease in the proportion of ankle sprains (31.0% vs 59.8%, p<0.001) and an increase in the proportion of clavicle fractures (50.0% vs 16.2%, p<0.001)(Figure 1). For ankle sprains, there was no significant difference in the proportion of anterior talofibular ligament injuries to high ankle sprains (p=0.898). There was no delay in presentation in the “pandemic” group compared to the “pre-pandemic” group (6.6 ± 9.6 vs 5.4 ±9.9, p=0.424).Conclusion:At our institution, we observed an over fivefold reduction in presentation for common pediatric musculoskeletal injuries typically associated with sports. The dramatic drop off in injuries occurring across both sports and non-sports injury mechanisms raises concern for presentation of untreated injuries in the future. Additionally, the increased proportion of injuries occurring in the home setting creates an opportunity for emphasis to be placed on basic safety precautions, especially for young children.Tables/Figures:Figure 1.Injury Distribution of Pre-Pandemic and Pandemic Time Periods

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.

Defining the contemporary epidemiology and return to play for high ankle sprains in the National Football League

ABSTRACT Background High ankle sprains and syndesmotic injuries are commonly sustained by National Football League players, yet there is apaucity of literature reporting the incidence, risk factors and return to play (RTP) rates for these injuries. The purpose of this study is to examine the epidemiology and trends in incidence of high ankle sprains across 11 NFL seasons. Methods Publicly available data from the 2009–2010 through 2019–20 seasons were reviewed to identify injuries and collect player characteristics and return to play. Incidence of high ankle injuries was calculated per 10,000 athlete-exposures. Linear regression was performed for incidence of injuries. Risk factors for failure to RTP were identified through multivariate logistic regression, controlling foryear of injury, player position, body mass index (BMI), age at injury, and years of experience before injury. Results A total of 533 high ankle sprains were identified in 498 players at an average age of 25.8 ± 3.1 and average BMI of 31.8 ± 4.6. The annual incidence of high ankle sprains in the NFL increased at alinear rate of 0.067per 10,000 player exposures (R2 = 0.3357) in 2009, to 1.75per 10,000 player exposures to 2.49 in 2019–20. Most injuries were in offensive players (304/533 injuries, 57.0%). Overall, 89.7% (478/533) of players returned to play; average RTP time was 80.5 ± 132.9 days. Defensive players had afaster RTP (68.1 ± 114.6 days) compared to offensive players (90.1 ± 144.8 days) (p = 0.084). Higher age at injury was found to increase the risk of failure to RTP (p = 0.0088). Conclusion RTP rate was high following high ankle sprain aamongNFL players at 90%, with an average recovery period of 11 weeks. Defensive players experience RTP faster than offensive players. Future studies are needed to determine performance outcomes following RTP, along with which patients might benefit from surgery.

785 Ankle Fractures Management in Stoke Mandeville Hospital

Abstract Introduction Ankle fractures treatment aims to restore joint stability and alignment to achieve full functional recovery. Current quality of care in Stoke Mandeville Hospital was compared to the gold-standard management approach as described in BOAST-12 guidelines. Method This closed loop audit looked at closed malleolar and syndesmotic ankle injuries in skeletally mature patients under Trauma and Orthopaedics. In the first audit cycle, 16 patients were included over a one-month period and 53 cases, with similar management, were identified over a three-month period for the second audit cycle. Results The initial audit cycle revealed that the main aspects of management that required improvement were the timing of reduction and splinting, as well as the documentation of neurovascular status post-reduction. We discussed our findings at the clinical governance meeting and interventional posters were distributed around the hospital. Documentation of the timing of reduction and splinting significantly increased from 6% to 85% post-interventions, and neurovascular examination post-reduction improved from 17% to 43%. All other quality assessment criteria recorded more than 90% documentation rates after implementation of changes. Conclusions Quality of care significantly improved post-interventions, which indicates that BOAST-12 gold-standard is achievable. The introduction of a proforma was suggested to further facilitate appropriate documentation.