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Real-time ultrasound was assessed as a means of evaluating osteoarthritis of the knee. The knee was maintained in complete flexion so as to expose the weight-bearing portion of the femoral condylar cartilage. After establishing the validity of the method in an excised bovine knee, 7 asymptomatic individuals, 10 arthritic patients, and several patients with other conditions were examined. The results indicated that sonography can be used to measure the thickness of the articular cartilage in man, as well as to detect changes in its surface and internal characteristics. Early changes of arthritis may be revealed in this manner.

A consistent radiologic finding for tumoral calcinosis was a dense calcified mass that was homogeneous except for a "chicken wire" pattern of lucencies, which correlated histologically with thin fibrous septae. Other characteristics of tumoral calcinosis included fluid-calcium levels, demonstrated in four patients, and smooth osseous erosions adjacent to the mass, demonstrated in three patients. Five cases of tumoral calcinosis were originally confused with other calcified lesions; however, the radiologic findings were characteristic of tumoral calcinosis in retrospect.