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(A) Grade 1 tracking (normal tracking) is shown. The medial facet is touching the medial femoral trochlea (large arrow). The lateral facet is touching the lateral femoral trochlea (small arrow). (B) Grade 1a tracking (near-normal tracking) is shown. The medial facet of the patella is lifted off the medial femoral trochlea by less than 2 mm (arrow). Q = quadriceps; P = patella; PT = patellar tendon.
