52-year-old male with pain at the proximal patella and lateral quadriceps tendon. Evaluate extensor mechanism. MENISCI: The medial lateral meniscus appear intact.ARTICULAR CARTILAGE AND BONE: There is mild thinning or degeneration of the articular cartilage along the anterior aspect of the medial femoral condyle, but the articular cartilage is otherwise within normal limits. There is focal edema within the anterior aspect of the patella, lateral to the midline, that appears to extend into a small enthesophyte of the quadriceps tendon. LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: There is focal edema within the anterior fibers of the quadriceps tendon at its insertion, just lateral to the midline, adjacent site of bone marrow edema seen within the patella, likely representing a focal partial-thickness insertional tear, probably of the lateral fibers of the rectus femoris. There is mild retraction of a few of the anterior fibers, but this is equivocal. The remainder of the quadriceps tendon appears slightly thickened suggestive of mild tendinosis. The patellar tendon is within normal limits.ADDITIONAL
1. Small focal insertional tear of the distal fibers of the quadriceps tendon, with edema within the underlying patella, on a background of mild tendinosis of the quadriceps.2. Mild degeneration of the articular cartilage of the anterior aspect of the medial femoral condyle.