Incidence and recognition of peroneal tendon dislocation associated with calcaneal fractures

Clinical Outcomes Following Suturing of Sheath of Peroneal Tendons to the Calcaneal Plate as an Innovative Technique for Reduction of Peroneal Tendon Instability Accompanying Calcaneal Fracture

BACKGROUND

The aim of the study was to evaluate the clinical and functional outcomes following suturing of sheath of peroneal tendons to the calcaneal plate as an innovative technique for reduction of peroneal tendon instability (PTI) accompanying calcaneal fracture surgically treated via extensile lateral approach (ELA).

METHODS

In a retrospective comparative study, among 245 operatively treated calcaneal fractures through ELA, we had 33 cases with PTI who underwent relocation of the peroneal tendons with ethibond suture in a figure-of-8 shape, passed through 2 parts of sheath of peroneal tendons and stitched to the calcaneal plate. Of the 33 cases, 12 were evaluated in the experimental group. Twelve surgically treated calcaneal fractures without PTI were matched as the control group. The outcome of the patients was assessed by American Orthopaedic Foot & Ankle Society (AOFAS) Ankle-Hindfoot Scale, Foot Function Index (FFI) percentage, Visual Analog Scale (VAS) pain, changes in Tegner activity level, maximal peroneal muscles strength testing, modified Star Excursion Balance Test (mSEBT), and triple hop for distance (THD) test. For the last 3 tests, the difference between operated and normal feet was calculated for each patient and this difference was compared between the 2 groups.

RESULTS

There was no statistically significant difference between the 2 groups for AOFAS Ankle-Hindfoot Scale (P = .09), FFI percentage (P = .12), VAS pain (P = .73), changes in Tegner activity level (P = .87), maximal peroneal muscles strength testing (P = .45), mSEBT (P > .05), and THD (P = .87) tests. We had a case with point tenderness on retromalleolar groove and 4 cases with paresthesia in the territory of the sural nerve in the experimental group in contrary to one case of sural nerve paresthesia in the control group (P = .31).

CONCLUSIONS

Relocation of peroneal tendons in PTI accompanying calcaneal fractures by fixing sheath of peroneal tendons to the calcaneal plate could be an acceptable procedure with good outcomes but may have increased chance of sural nerve injury.

LEVELS OF EVIDENCE

Therapeutic, Level III: Retrospective.

Lateral Wall Displacement of Calcaneal Fracture Leading to Peroneal Tendon Dislocation: Effect of the Distance of Lateral Wall Displacement on the incidence of Peroneal Tendon Dislocation

Peroneal tendon dislocation accompanying an intra-articular calcaneal fracture is uncommon; however, such dislocations are often missed in the acute phase. Although risk factors have been reported, the correlation between the degree of lateral wall displacement of the fractured calcaneus and the incidence of peroneal tendon dislocation remains unclear. We retrospectively analyzed computed tomography scans of 61 patients who had calcaneal fractures to examine peroneal tendon dislocation and the association with degree of lateral wall displacement and presence of fleck signs, between peroneal tendon dislocation and non-dislocation cases. Peroneal tendon dislocation was observed in 11.5 % (7/61) of the scan of patients with acute calcaneal fractures. The mean measurement of lateral wall displacement of the calcaneus was -3.3 (-11.1 to 8.9) mm. The fleck sign on radiographic images was evident in two cases (3.3 %), whereas the fleck sign on scans was evident in three cases (4.9 %). The mean measurement was significantly greater in cases with peroneal tendon dislocation than in those without dislocation (3.0 vs -4.1 mm, P<.05). The incidence of peroneal tendon dislocation and the lateral wall distance were significantly associated with the severity of calcaneal fractures, according to the Sanders classification system. The area under the curve generated for the medial deviation of the receiver operating characteristic curve was 0.976 and the cut-off value was 0.9. This study showed that lateral wall displacement is related to peroneal tendon dislocation and that the measurement of displacement using computed tomography scans can be a useful indicator of peroneal tendon dislocation.

Incidence of peroneal tendon dislocation with talus fracture

BACKGROUND

Traumatic peroneal tendon dislocation (PTD) is known to occur with pilon and calcaneus fractures, however, literature describing PTD in concurrence with injury to the talus remains limited.

METHODS

This was a retrospective review of adult patients with operatively treated talus fractures treated at a level I academic trauma center between 2007 and 2021. Charts, radiographs, and advanced imaging, when available, were reviewed for patient demographics, injury characteristics, and complications.

RESULTS

126 patients with 128 talus fractures were included. Incidence of PTD after talus fracture was 21.1 % (n = 27). Among isolated talus fractures only (n = 60), incidence of PTD was 16.7 % (n = 10). Peroneal rupture was separately found in 3 instances (2.3 %). PTD was significantly associated with lateral process fractures, making up one-third of total cases of PTD (p = 0.02), with 39 % of lateral process fractures demonstrating PTD. PTD was also associated with presence of fleck sign on injury radiographs (p < 0.00001). Among 27 cases of PTD, 14 (51.9 %) were diagnosed based on advanced imaging only (13 via CT scan and 1 by MRI), 4 (14.8 %) by operative report only, and 9 (33.3 %) based on both imaging and the operative report. Diagnosis was made acutely for 25 (89.3 %) PTDs, whereas 2 (7.4 %) were diagnosed in a delayed fashion. Three PTDs underwent delayed surgical intervention due to delayed diagnosis (n = 1), or missed dislocation by the surgeon although evident on injury scans (n = 2). Fractures with PTD developed higher rates of avascular necrosis (30.4 % versus 12.7 % among fractures without PTD, p = 0.044).

CONCLUSION

PTD with talus fracture is relatively common and was identified in one out of five fractures within the studied cohort. Surgeons and radiologists should be cognizant of this injury, especially in the setting of a lateral process fracture and a positive fleck sign.

LEVEL OF EVIDENCE

III.

Prevalence and Predictors of Peroneal Tendon Instability Accompanying Calcaneal Fractures

BACKGROUND

We aimed to find the prevalence of peroneal tendon instability (PTI) accompanying different types of calcaneal fractures and to determine predictors of PTI based on preoperative CT scanning.

METHODS

In a retrospective cross-sectional study, preoperative CT scans of 400 consecutive calcaneal fractures undergoing surgery were reviewed for comminuted fragments in the lateral gutter of the ankle, fractures at the tip of the lateral malleolus, dislocated peroneal tendons, excessive displacement of the lateral calcaneal wall, calcaneal fracture-dislocation, superior peroneal retinaculum (SPR) avulsion fracture (fleck sign), and shape of the retromalleolar groove. The correlation of these variables with intraoperative SPR stress test, defined as the diagnostic criteria for PTI in calcaneal fractures, was evaluated.

RESULTS

In total, 369 patients (mean age, 39 ± 13; range, 11-72 years), with 321 (87.0%) of them male, were included. Among all calcaneal fractures, 67 cases (16.7%) had associated PTI as confirmed intraoperatively by an SPR stress test. A statistically significant association was found between PTI in calcaneal fractures and comminuted fragments in the lateral gutter of the ankle (P = .03), dislocated peroneal tendons (P < .001), calcaneal fracture-dislocation (P < .001), SPR avulsion fracture (P < .001), and Sanders type IV of calcaneal fracture (P = .02). There was no statistically significant relationship between PTI and the mechanism of injury (P = .98), side of fracture (P = .30), uni- or bilateral calcaneal fractures (P = .27), a fracture at the tip of lateral malleolus (P = .69), shape of the retromalleolar groove (P = .78), or excessive displacement of the lateral calcaneal wall (P = .06). The most specific CT finding to predict PTI accompanying calcaneal fractures was calcaneal fracture-dislocation (99.1%).

CONCLUSION

Following calcaneal fracture fixation, PTI was confirmed with intraoperative SPR stress test in one-sixth of cases. With the exception of calcaneal fracture-dislocation, preoperative findings on CT scanning and calcaneal fracture pathoanatomy are insufficient to diagnose PTI accompanying calcaneal fractures.

LEVEL OF EVIDENCE

Level III, retrospective case control study.

Incidence and clinical results of tendinous injuries in calcaneus and pilon fractures

PURPOSE

The aims of this study were: (1) to define the incidence of tendinous injuries in calcaneus and pilon fractures with different fracture severity and (2) to determine the clinical impact of such injuries.

STUDY DESIGN AND METHODS

CT-scans of 121 patients with calcaneus and pilon fractures were retrospectively analyzed over a 4-year period. The tendinous injuries were identified and correlated with the type of fracture (location and classification). Clinical analysis was performed using the American Orthopedic Foot and Ankle Society (AOFAS) and SF-36 (Short Form-36 Health Survey) scores.

RESULTS

Tendinous injuries were observed in 36% of all CT-scans analyzed, with the most common injury being incarceration (n = 20) and dislocation (n = 24). Calcaneus fractures sanders type 3/4 were 9 times more prone to tendon injury (p < 0.001; OR 8.67; 95% CI 2.49-30.24). Pilon fractures Ruedi-Allgower type 2/3 were 8 times more prone to tendon injury (p = 0.005; OR 7.5; 95% CI 1.72-32.80). No significant differences (p > 0.05) were found in AOFAS and SF-36 scores between patients with/without tendon injuries for fractures with the same severity.

CONCLUSION

The incidence of tendon injuries in calcaneus/pilon fractures is high and may be underreported. Calcaneus fractures are prone to peroneal tendon injury. In pilon fractures, it is important to look for tibialis posterior tendon injury, especially entrapment. The presence of tendinous injuries does not affect function and pain for the same type of calcaneus and pilon fractures at the long term.

LEVEL OF EVIDENCE

Level 3 retrospective study.

Simultaneous traumatic dislocation of the posterior tibial tendon and long peroneal tendon: a case report

Background

Viewing the existing literature, one can find several documents about dislocation of the peroneal tendons. Clinical findings, diagnostics, and therapy are well described. Instead, the list of documents describing dislocations of the posterior tibial tendon is short. We found no case in which a dislocation of both long peroneal tendon and posterior tibial tendon is described.

Case presentation

We present a case of a 29-year-old male patient who sustained an ankle injury after a fall at a boulder gym. He admitted himself with severe pain, tenderness, and swelling of his left ankle. Dislocation of the posterior tibial tendon and simultaneous dislocation of the long peroneal tendon was diagnosed using x-ray, computed tomography, and magnetic resonance imaging. Transosseous suture repair with periosteal augmentation of the flexor retinaculum was performed at the medial malleolus. At the lateral malleolus, transosseous suture was used to repair the superior retinaculum. The ankle was immobilized following surgery. The patient underwent physical therapy afterwards. The treatment resulted in good recovery, and the patient returned to the same level of performance at rock climbing.

Conclusion

Our novel finding is that simultaneously sustained dislocations of the posterior tibial tendon and the long peroneal tendon may occur and can be successfully treated as if each injury is treated individually. Level of evidence Level V, case report.

Peroneal Tendon Subluxation and Dislocation in Calcaneus Fractures

The present study investigated the relationship between type of calcaneal fractures and subluxation or dislocation of peroneal tendon. Also, we investigated clinical outcomes of patients with both calcaneal fractures and dislocations or subluxations of peroneal tendons in early surgical treatments (at the time of surgery for calcaneal fractures) and delayed surgical treatment (at the time of surgery for calcaneal plate removal) for dislocations or subluxations of peroneal tendons. We included 151 patients with calcaneal fractures who were followed for ≥2 years after surgery. Among them, 21 cases (13.9%) required reduction for peroneal tendon subluxation or dislocation. Reductions of peroneal tendons were performed at the time of surgery for calcaneal fractures in 11 cases, whereas the other 10 cases were performed during surgery for calcaneal implant removal. As classified by Essex-Lopresti, 94 cases (62.3%) were joint depression type and 17 (18.1%) were accompanied by dislocations or subluxations of peroneal tendons, whereas 57 (37.7%) were tongue type and 4 (7.0%) were accompanied by dislocations or subluxations of peroneal tendons. As classified by the Sanders system, 96 cases (63.6%) were Sanders A fracture lines, and 18 (18.8%) were accompanied by dislocations or subluxations of peroneal tendons. In 55 cases (36.4%) without Sanders A fracture lines, 3 (5.5%) were accompanied by dislocations or subluxations of peroneal tendons. In conclusion, calcaneal fractures with peroneal tendon dislocations are more common in joint depression type and Sander A type. Also, after a ≥2-year follow-up period, there were no significant differences in visual analog scale or foot and ankle outcome score whether reduction of peroneal tendons was done with reduction of fracture or removal of implant of calcaneus.

Can We Release All Calcaneal Attachments of the Superior Peroneal Retinaculum During Extensile Lateral Approach to the Calcaneus?

During extensile lateral approach to the calcaneus, in order to see all fractured fragments and subtalar joint, all soft tissues including insertion site of superior peroneal retinaculum (SPR) on the calcaneus should be released. The aim of this study was to evaluate the probability of peroneal tendon dislocation by releasing all soft tissues attached to the calcaneus. In 10 fresh cadavers, after standard extensile lateral approach to the calcaneus in right side, all soft tissues attached to the lateral wall of the calcaneus were excised. In the left side of each cadaver, all soft tissues inserted to the superior border of calcaneal tuberosity in addition to the lateral wall of the calcaneus were cut out. Probable anterior dislocation of peroneal tendons in the retromalleolar groove was assessed by placing a clamp into the peroneal tendon sheath from distal to proximal and advancing it to the retromalleolar groove. Also by careful dissection, any instability of peroneal tendons was visualized. Not any anterior dislocation of peroneal tendons to the lateral malleolus tip was seen in any stage of the procedure. Insertions of the SPR to the fascia of the deep posterior compartment of the leg and the Achilles tendon sheath are the main soft tissue stabilizer of the peroneal tendons in the retromalleolar groove. So resection of the insertion site of the SPR to the calcaneus might not result in the peroneal tendon instabilities.

Comparing open reduction and internal fixation versus closed reduction using dual-point distraction and percutaneous fixation for treating calcaneal fractures

Objectives

This study aims to compare the early clinical, functional and radiographic outcomes of a small cohort of patients with calcaneal fractures treated with closed reduction using a dual- point distraction system and the traditional lateral approach.

Patients and methods

We prospectively treated 40 patients with calcaneus fractures who presented to our emergency department between January 2017 and February 2018. In total, 35 patients (22 males, 13 females; median age 39.8 years; range, 19 to 57 years) were included in this study since five patients were not followed up. Fractures were classified according to the Sanders classification system using computer tomography images. Clinical outcomes including postoperative two-week visual analog scale (VAS) score, sickness absence period, operating time and complication rate were recorded.

Results

The mean follow-up period was 24 months. Closed reduction using dual-point distraction and percutaneous fixation (group 1) was performed in 17 patients, whereas the extended lateral approach (group 2) was used in 18 patients. There were no significant differences between both groups in age, follow- up outcomes and Sanders classification. Operating time was significantly shorter in group 1 than in group 2. At postoperative two weeks, VAS scores were significantly lower in group 1 than in group 2. The complication rate and sickness absence period were significantly lower in group 1 than in group 2.

Conclusion

Closed reduction using dual-point distraction can be preferred owing to many advantages including considerably decreased risk of wound complications, sickness absence period and length of hospital stay as well as superior postoperative rehabilitation with a low pain score.

Peroneal tendon dislocation in talus fracture and diagnostic value of fleck sign

Introduction

Talus fractures are not uncommon and one of the serious fractures in the foot and ankle. Peroneal tendon dislocation is one of the commonly missed soft tissue injuries which may have significant impact on the outcomes including persistent pain and swelling. They have been reported to be associated with calcaneum as well as talus fractures.

Aim

To report the incidence of peroneal tendon dislocation in talus fracture and the significance of fleck sign in the diagnosis of peroneal tendon dislocation.

Methods

We retrospectively reviewed 93 consecutive talus fractures in the period between 1/1/2011 to 1/11/2018. Inclusion criteria were: The patient underwent open reduction and internal fixation, had pre-operative CT scan that is available for review and three view ankle plain radiographs. Two independent authors review the radiographs for peroneal tendon dislocation, fleck sign and fracture classification, if any. Any dispute was resolved by the senior author.Patient records were reviewed for laterality, age, sex,mode of injury, associated injuries and operative interventions. 50 ankles met the inclusion criteria. 49 were males, mean age was 32.5 year and the predominant mode of injury was a fall from height.

Results

Peroneal tendon dislocation was found in ten patients out of 50 (20%). Risk of dislocation increased with severity of the fracture and neck fractures. Most of the dislocations were missed by surgeons and radiologist, and no additional procedures were done to address such an injury. The Fleck sign had a statistically significant correlation with peroneal tendons dislocations (p=.005)

Conclusion

Peroneal tendons dislocation is associated with as high as 20% of talus fractures. The authors recommend carefully reviewing CT scans by surgeons and radiologists alike to avoid missing such injury and allow for appropriate surgical approach utilization. The Fleck sign is a highly specific radiographic sign that has a statistically significant correlation with PT dislocation and hence we recommend intra-operative assessment of peroneal tendons in patients with the fleck sign.

[Injuries of the peroneal tendons : Often overlooked]

CLINICAL ISSUE

Injuries of the peroneal tendons are rare and often overlooked. Typical pathologies are tendinitis, tears and dislocation. Accompanying injuries are fractures. They are often associated with instability in the ankle and rearfoot deformities; therefore, these pathologies should be excluded or taken into consideration in the treatment. The clinical examination is crucial for the diagnosis.

DIAGNOSTIC WORK-UP

Ultrasound and magnetic resonance imaging (MRI) examinations are very helpful; however, the true extent of the tendon pathology is often first seen during surgery. Bony injuries and deformities are assessed radiographically and by computed tomography (CT).

PERFORMANCE

Although conservative treatment is generally used at the beginning of therapy, progression is more likely to occur in the case of tears; therefore, the correct timing for an operative therapy should not be missed. Dislocations are the domain of operative therapy. Acute tendinitis, on the other hand, is usually accessible to conservative therapy if it is not the result of a gross deformity.

ACHIEVEMENTS

Rehabilitation after operative treatment is demanding and prolonged especially after operative therapy of peroneal tendon tears. The results to be expected appear promising.

Prevalence of Peroneal Tendon Instability in Calcaneus Fractures: A Systematic Review and Meta-Analysis

Peroneal tendon instability associated with an intraarticular calcaneal fracture is a common injury that still often passes undiscovered by both radiologists and orthopedic surgeons. Timely identification of this injury will guide the choice of surgical technique used and treatment of patients. Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, several databases were searched through June 2017 for any observational or experimental studies that reported the prevalence/incidence of peroneal tendon subluxation/dislocation with a calcaneus fracture with regard to fracture classifications and the significance of the fleck sign. Nine studies were included, with 1027 patients and 1050 calcaneus fractures. The overall prevalence of peroneal instability (PI) in association with a calcaneus fracture was 29.3%. An increasing prevalence of PI increased the severity of the calcaneus fractures, 5.4% in Sanders I, 19% in Sanders II, 39.4% in Sanders III, and 49.5% in Sanders IV. The presence of a fleck sign is a strong indicator of PI, with a prevalence of 54.7%. The computed tomography findings can overestimate the presence of PI compared with the intraoperative findings. The global reported prevalence of peroneal tendon instability associated with intraarticular calcaneal fractures is high and increases with increasing severity of the calcaneus fracture.

The lateral malleolar bony fleck classified by size and pathoanatomy: The IOFAS classification

BACKGROUND

This study analyzes position of the peroneal tendons and status of the superior peroneal retinaculum (SPR) whenever a lateral malleolar bony flake fracture occurs.

METHODS

Twenty-four patients had a lateral malleolar bony fleck on anteroposterior ankle radiographs, either in isolation or associated with other hindfoot injuries. We studied size of the bony flecks, presence or absence of peroneal tendon dislocation and pathoanatomy on CT scans.

RESULTS

In 11 patients, a small bony fleck lies within the superior peroneal retinaculum and contiguous periosteum, which are stripped off the lateral fibula (Class II lesions). Tendons dislocate into the subperiosteal pouch thus formed, resembling Class I lesions without associated bony avulsion. Treatment for Class II is same as for Class I injuries. In 8 patients with a big bony fleck, tendons dislocate into the fracture site and SPR is intact (Class III lesions). In Class IV lesions, observed in 5 patients with 2-part calcaneal fracture/dislocation, SPR remains intact and peroneal tendons are not dislocated. The invariably large fleck results from the displacing lateral calcaneal fragment abutting against the fibula, whereas the dislocating tendons cause the bony avulsions in Classes II and III.

CONCLUSIONS

Due to pathoanatomical differences, surgical approach and natural history of neglected lesions differ depending on size of the bony fleck. The SPR must not be incised in case of big Class III flecks.

Calcaneal fractures: radiological and CT evaluation and classification systems

Background and aim of the work: The calcaneus, the more lower bone of the body, has the task of supporting the axial load from the weight of the body. Calcaneal fractures represent about 1-2% of all fractures and 60% of the tarsal bones fractures. The articular involvement has been associated with a poor functional outcome. The aim of this work is to describe the radiologic evaluation, the classification systems, the morphological preoperative diagnostic imaging features of calcaneal fractures, highlighting the correlation with the choice of treatment and predictive capacity for the fracture surgical outcome. Methods: A PubMed search was performed for the terms Imaging calcaneus fracture, selecting articles in English language, published in the last two years, where preoperatively diagnostic imaging of fractures of the calcaneus are described. Case reports have not been included. Results: We have collected a number of data that provide important help in preoperative evaluation of calcaneal fractures, such as the new classification system created by Harnroongroj et al, the association of calcaneal fractures with fractures of other bone structures or soft tissue impairment, the use of calcaneotalar ratio in assessing the length of heel. Conclusions: These data suggest an approach geared to the specific choice of treatment and to improving patient outcomes. (www.actabiomedica.it)

The recognition and incidence of peroneal tendon dislocation associated with a fracture of the talus

AIMS

The purposes of this study were to clarify first, the incidence of peroneal tendon dislocation in patients with a fracture of the talus and second the factors associated with peroneal tendon dislocation.

PATIENTS AND METHODS

We retrospectively examined 30 patients (30 ankles) with a mean age of 37.5 years, who had undergone internal fixation for a fracture of the talus. Independent examiners assessed for peroneal tendon dislocation using the pre-operative CT images. The medical records were also reviewed for the presence of peroneal tendon dislocation. The associations between the presence of dislocation with the patient characteristics or radiological findings, including age, mechanism of injury, severity of fracture, and fleck sign, were assessed using Fisher's exact tests.

RESULTS

The pre-operative CT images showed peroneal tendon dislocation in eight out of 30 patients. Dislocation was found later in one patient whose pre-operative CT image had not shown dislocation. The overall incidence of peroneal tendon dislocation was 30% (9/30). The presence of dislocation was associated with the presence of a fleck sign (p = 0.03).

CONCLUSIONS

Surprisingly, approximately one-third of the patients who underwent internal fixation for a fracture of the talus had peroneal tendon dislocation. This was associated with a fleck sign. Cite this article: Bone Joint J 2017;99-B:489-93.

Peroneal Tendon Instability in Intra-Articular Calcaneus Fractures: A Retrospective Comparative Study and a New Surgical Technique

OBJECTIVE

To compare the prevalence of peroneal tendon instability as determined by intraoperative evaluation versus preoperative computed tomography (CT) scans, and to identify specific risk factors that correlate with tendon instability.

DESIGN

Retrospective comparative study.

SETTING

Level 1 trauma hospital.

PATIENTS

Patients with operatively treated intra-articular calcaneus fractures managed between January 1, 2002 and December 31, 2012 were reviewed for evidence of peroneal tendon instability. Of 254 fractures, 155 intra-articular calcaneus fractures met inclusion criteria and were available for final analysis.

INTERVENTION

Operative notes were reviewed to confirm intraoperative testing for superior peroneal retinaculum (SPR) integrity and peroneal tendon stability. Preoperative CT scan and plain radiographs were evaluated for presence of peroneal tendon dislocation, fibular fracture or "fleck" sign, excessive lateral wall displacement, and/or calcaneal fracture-dislocation.

MAIN OUTCOME MEASURES

Peroneal tendon stability was determined with intraoperative assessment of the intact SPR and its confluence with the peroneal tendon sheath. The incidence of peroneal tendon instability on intraoperative assessment was compared with preoperatively identified tendon dislocation on CT scan. Prevalence of peroneal tendon dislocation was determined using each diagnostic method. Risk factors for tendon instability were identified using a multivariate regression model.

RESULTS

There was significantly higher prevalence of peroneal tendon instability as determined by preoperative imaging (30%; n = 47/155) compared with intraoperative retinaculum testing (11.6%; n = 18/155) (P < 0.001). Intraoperative tendon instability was significantly associated with increased fracture classification severity, fibular fracture/"fleck" sign, and fracture-dislocation.

CONCLUSIONS

Intraoperative evaluation of the SPR should be used in conjunction with preoperative imaging for diagnosis of peroneal instability in the setting of operatively treated, intra-articular calcaneus fractures.

LEVEL OF EVIDENCE

Diagnostic Level IV. See Instructions for Authors for a complete description of levels of evidence.