Patellar pain and incongruence. I: Measurements of incongruence.
In 150 normal asymptomatic knees, the average Q angle was 15 degrees. The patellar length was equal to the patellar ligament length, and the average congruence angle was -8 degrees. In 53 knees with recurrent subluxation, the patella was high-riding (TP, 1.23), the sulcus angle was shallow (147 degrees), and the average congruence angle was +16 degrees. In 53 knees with "chondromalacia," the Q angle was increased (20 degrees), and the average congruence angle was -2 degrees.
D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D002357:Cartilage Diseases / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology*; D007717:Knee / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008297:Male; D010146:Pain / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology*; D010329:Patella / Q000000981:diagnostic imaging / Q000503:physiopathology*; D011859:Radiography