Adult-onset spontaneous osteonecrosis of the tarsal navicular joint, or Mueller–Weiss syndrome (MWS), is an uncommon debilitating disease characterized by a painful clinical course with progressive midfoot deformity. Treatment options include nonoperative management and/or operative intervention, including percutaneous decompression of the navicular bone, stabilization of existing structures, and cancellous bone grafting from the tibia or iliac crest. To our knowledge, there have been no reported cases of treatment of MWS with a vascularized bone graft. We report an unusual case of unilateral MWS in a 25-year-old male who failed nonoperative therapy and was successfully treated with a novel operative approach using debridement followed by a free medial femoral condyle vascularized bone graft. At 18-month follow-up, the patient demonstrated an excellent outcome with return to previous level of function, including work-related and recreational activities.
Level of Evidence: Therapeutic, Level IV: Case study
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