[Calcium oxalate microcrystalline arthropathy in primary oxalosis]

This paper dealt with the case of a 53 years old man, affected by a chronic renal failure as the initial symptom of a primary oxalosis and treated by hemodialysis three years ago. Two years after the onset of renal failure, the left knee was painful and swollen but no cartilage or bone joint lesion was observed. Presence of intra synovial calcium oxalate crystals suggests that this arthropathy may be related to the primary oxalosis. However the role of other calcium salts under identification evidenced by synovial electron microscopy (apatite ? pyrophosphate ?) is discussed.