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Category:   Diabetes; Ankle; Hindfoot; OtherIntroduction/Purpose:   Charcot arthropathy of the ankle and hindfoot is a progressive and destructive process that can lead to instability and ulceration resulting in significant morbidity. When indicated, the surgical goals are to restore a stable plantigrade foot, reduce the risk of ulceration, and improve function to independent ambulation. Techniques for reconstruction of the neuropathic ankle/hindfoot include external and/or internal fixation. Current literature involving small series of surgical patients has shown a high rate of limb salvage and low complication rate. Our experience has been less promising, although we believe it remains a viable option. It is our goal to report the outcomes of Charcot patients undergoing corrective ankle and hindfoot reconstruction.Methods:   We retrospectively reviewed 377 patients undergoing hindfoot and ankle arthrodesis at our institution from 2006- 2017. 77 patients were identified that underwent arthrodesis for Charcot arthropathy, 51 of which met inclusion and exclusion criteria with a minimum one year follow up. 42 had internal fixation as their primary procedure (plate or nail) and 9 patients underwent external fixation with a multi-planar external fixator. Median follow up time was 4 years (IQR 2.97 years). Preoperatively, basic demographic variables, etiology of neuropathy, ulcer status, radiographic measurements, Brodsky classification, and presence of a viable talus were collected and analyzed. Postoperatively, we collected complications including infection, hardware failure, ulceration, recurrent deformity, and nonunion. Reoperation numbers and indications for reoperation were also collected. The primary outcome measure was limb salvage at final follow up. Secondary outcome measures were ambulatory and footwear/bracing status.Results:   11 patients (20%) underwent amputation at final follow up and 26 (47.3%) achieved radiographic union, both of which did not vary by fixation type (p=0.67 and p=0.88). The primary reasons for amputation were persistent infection and non-union. 74.5% of patients developed a post-operative complication and 58.2% had at least one reoperation. 25.5% of patients developed a post- operative infection. Patients with a pre-operative ulceration were more likely to undergo external fixation (p=0.02), but amputation rates did not differ between groups (p&gt;0.99). There was a trend toward increased risk of post-operative infection in the ulceration group (p=0.07). A pre-operative Meary’s angle &gt;25° was more likely to undergo amputation (p=0.04) and less likely to achieve radiographic union (p=0.05). 75.9% of patients were ambulatory at final follow up.Conclusion:   Our rates of amputation (20%), post-operative infection (25%), complications (74.5%) and non-union (52%) are higher than previously described. Previous literature has described a near 100% limb salvage rate, but in our report on a large series of Charcot patients undergoing hindfoot/ankle arthrodesis we describe an 80% limb salvage rate. Pre-operative Meary’s angle &gt;25° was predictive of treatment failure.

Complication Rates in Ankle and Hindfoot Charcot Arthropathy Treated with Arthrodesis