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Fig. 2 —39-year-old man who had been bothered by knee pain for more than 1 year, especially while riding his bicycle competitively. Knee radiography and MRI were normal. Longitudinal sonogram at level of lateral femoral condyle reveals unsuspected calcification of hyaline cartilage (arrowheads). This area was focally tender to probe pressure, confirming chondrocalcinosis as underlying cause of pain.