Abstract
To measure the patellar height the ratio of the articular length of the patella to the height of the lower pole of the articular cartilage above the tibial plateau is measured on a lateral radiography of the knee, flexed beyond 30 degrees. Normal values lie between 0-54 and 1-06. The subluxing patella is at the upper end of the normal range, but, in chondromalacia, the male patellae were lower than average, but the female patellae were normal.
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