Charcot arthropathy presenting with primary bone resorption

BackgroundThe clinical presentation of acute Charcot arthropathy in the diabetic population usually follows the Eichenholtz classification. We present three usual cases of Charcot arthropathy presenting with rapid primary bone resorption in the absence of subluxation, dislocation and/or fracture.MethodsA review of the literature was performed. To our knowledge Charcot arthropathy has not been previously described as primary bone resorption.Case reportsThree cases encountered at our specialist multidisciplinary High Risk Foot Clinic (HRFC) presented with primary bony resorption without features of subluxation, dislocation and/or fracture.DiscussionAggressive primary bone resorption was initially thought due to infection; a diagnostic dilemma that delayed optimal treatment. Late bone resorption in typical Charcot is linked to unregulated proinflammatory cytokines (IL-1β, IL-6 and TNFα) that lead to increased osteoclastic activity. The pathophysiology of osteolysis in aggressive primary bony resorption may relate to a disturbance in the balance between RANK-L and OPG.ConclusionPrimary resorption of bone without subluxation, dislocation and/or fracture can represent an active Charcot process. Prudent use of serial radiography and early MRI to look for the widespread bone and soft tissue oedema is recommended.