Abstract
Alkaptonuria is a rare disease characterized by the accumulation of homogentisic acid (HGA). Over time, these patients may develop disabling ochronotic arthropathy. We present 2 cases of patients with end-stage arthropathy treated with total knee arthroplasty (TKA). Both patients complained of disabling knee pain and reported limited walking distance (200-300 m). One had a history of osteotomy for medial knee arthtritis and ignored his underlying condition. The other presented with valgus gonoarthrosis and diagnosis of alkaptonuria. Intraoperatively, the characteristic dark-blue color in the joint was observed. Both patients evolved favorably after TKA with excellent results according to the Knee Society Scores (KSS) at three years of follow-up. We believe TKA is the right treatment for patients with end-stage disease because it offers considerable relief from pain and allows patients to recover function.
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