Short-Term Complications Following Early Protected Weight Bearing after Flatfoot Reconstruction when Utilizing a Fibertape Device for Spring Ligament Reefing Augmentation

Abstract

Category: Ankle Introduction/Purpose: In an estimated 70% of cases of Adult Acquired Flatfoot Deformity (AAFD) reconstruction, the spring ligament is elongated and/or damaged. Spring ligament reefing can be performed through several techniques including augmentation with Fibertape devices. In addition, biomechanical studies have demonstrated its safety and suggest early weight bearing may be performed. The purpose of this study is to evaluate the outcomes of early weight bearing following flatfoot reconstruction with use of InternalBrace augmentation for spring ligament reefing when performed in combination with medical displacing calcaneal osteotomy (MCO) and FDL tendon transfer. Methods: From 2016-2018, 45 patients underwent flatfoot reconstruction (MCO, FDL transfer, and gastrocnemius recession) with spring ligament reefing and augmentation with the InternalBrace device. All surgeries were performed by the senior orthopaedic surgeons (PJJ & MCA). Institutional early post-operative weight bearing protocol involves weight bearing as tolerated in a splint with crutches for two weeks, transitioning at 2 weeks to a Cam boot with 1 wedge WBAT. At 4 weeks, the patient is weaned off crutches and recommended to start therapy restricting excessive eversion and concentrating on calf strengthening, gait, and ROM. At weeks 6-8 they are weaned from the Cam boot into lace up ASO and shoe with arch support. Data were recorded at 2 weeks, 6 weeks, 12 weeks, 6 months and at yearly intervals. Outcomes and complications were documented. Results: Of the 45 cases there were no complications related to early weight bearing. Radiographic bony union rate of the MCO was 100% (45/45). Moreover, there was no loss of fixation of either the FDL transfer or spring ligament reefing with InternalBrace augmentation with early weight bearing. Lastly, radiographic evaluation noted no loss of Meary’s talo-first metatarsal angle when comparing initial postoperative radiographic to their final follow up. Additional complications in our cohort included the following: removal of painful hardware (1, 2.22%), sural neuritis (2, 4.44%), superficial cellulitis (1, 4.44%), and delayed lateral wound healing (1, 2.22%). Conclusion: Preliminary data shows that early protected weight bearing after flatfoot reconstruction and augmentation of the spring ligament with the InternalBrace device is safe and demonstrates few complications and no early loss of correction.