The Forty-five-Degree Posteroanterior Flexion Weight-Bearing Radiograph of the Knee
Thomas Rosenberg, Lonnie Paulos, Richard Parker, David Coward, Steven Scott
JBJS 1988
PA x-ray with the knee in 45 degrees of flexion and the patella touching the cassette. The beam is aimed at the inferior pole of the patella and aimed 10 degrees caudad,
55 patients in 1981-1982 (age 19-70)
Major narrowing in the medial compartment
AP xray - 25%
Rosenberg - 85%
Major narrowing in the lateral compartment
AP xray - 30%
Rosenberg - 80%
Additional advantage of identifying osteophytes in the notch, loose bodies, OCD and SONK