Patellar Pain and Incongruence

In 150 normal asymptomatic knees, the average Q angle was 15%. The patellar length was equal to the patellar ligament length, and the average congruence angle was-8%. In 53 knees with recurrent subluxation, the patella was high-riding (TP, 1.23), the sulcus angle was shallow (147%), and the average congruence angle was +16%. In 53 knees with “chondromalacia,” the Q angle was increased (20%), and the average congruence angle was-2%.