Charcot arthropathy secondary to amyloid neuropathy.

Neuropathic (Charcot) ankle joints developed in a 50-year-old patient with end-stage renal disease from primary, nonfamilial amyloidosis. Sensory neuropathy in the legs had been noted three years before the onset of uremia and had porgressed. Sural nerve, but not synovial biopsy specimen, showed amyloid in and around arteriolar walls by light and electron microscopy. Since Charcot joints are only rarely associated with amyloid neuropathy, it is possible that uremic neuritis, or prolonged survival by dialysis, contributed to progression of the neuropathy, allowing subsequent joint degeneration.