Chopart Fractures and Dislocations: Case Series and New Algorithm of Treatment

Abstract

Category: Trauma Introduction/Purpose: Chopart fractures and dislocations are one of the most commonly overlooked injuries of the foot. These injuries are still challenging in both diagnosis and treatment and result in a high degree of long-term disability. Recent studies have shown that around 30 to 40% of these injuries are not adequately diagnosed on first consultation, mainly because of their low incidence and high clinical variability/spectrum of injuries. Anatomical reduction of Chopart injuries seems to be the most important prognostic factor of functional outcomes. However, there is still no consensus or clear evidence-based guidelines on the management of these types of injuries. We report the result of our current management protocol and propose a new algorithm of management of Chopart Injuries. Methods: We present a case series of patients with Chopart fractures and fracture-dislocations admitted to a Level 1 Trauma center between March 2015 and April 2020. Demographic data, mechanism of injury, treatment and complications were obtained from clinical records. Classification of injuries according to Zwipp was performed. Standardized surgical management was performed in 1 or 2 stages, according to soft tissue status. Open reduction and internal fixation of associated fractures of the talus, navicular, calcaneus and cuboid was performed. In cases of severe articular comminution or presence of medial and/or lateral instability, transarticular bridge plating was indicated. Postoperative radiological assessment was performed with X-rays and CT scan. Outcomes were determined using the American Orthopaedic Foot & Ankle Society midfoot score (AOFAS), visual analogue scale (VAS), foot and ankle ability measure (FAAM) and the 12-item Short Form Survey (SF-12). Results: Thirty four patients (12 women) were included in this study with a mean age of 37 years. Mechanisms of injury were: motor vehicle accidents (n=12), low energy midfoot torsion (n=12), crushing injuries (n=7), fall from height (n=2) and firearm injury (n=1). Mean follow up was 39 months (ranging from 8 to 71 months). The mean AOFAS score 84.8 (SD 12.9), mean FAAM of 84.4% (SD 15.4) and mean VAS score was 3/10. In terms of quality of life, the SF-12 physical component score was 43.59 (SD 9.3), with a mental component score of 51.98 (SD 12.1). Secondary procedures included: hardware removal (n=23), midfoot fusion (n=3) and skin coverage procedures by plastic surgery (n=5). Conclusion: In this case series, a standardized strategy for the treatment of Chopart injuries including the use of external fixation, ORIF and transarticular plating is presented. Reestablishment of joint alignment of both columns (medial and lateral) is crucial to obtain acceptable functional outcomes. Transarticular fixation is a useful alternative to post-reduction residual instability and bridging of fractures with periarticular comminution. Functional and quality of life results on this series were acceptable and comparable to previous reports at minimum one year follow up. Long-term follow up is needed to further validate the proposed algorithm.