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ADVANCE® Medial-pivot total knee arthroplasty, definition of patella tilt, and patella shift. (a) Post-operative radiographs after ADVANCE® Medial-pivot total knee arthroplasty. (b) The patella tilt is the angle between the anterior intercondylar line and the transverse axis of the patella. (c) Patella shift is the lateral displacement of the median ridge of the patella from the intercondylar sulcus of the femur
