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Patellar Dislocation

Basics Description Patellar dislocation usually refers to lateral displacement of the patella out of its normal alignment in the trochlear groove of the femur. The patella is held stable by ligamentous forces, muscular forces, and bony anatomy. Disruption of any of these 3 components can lead to recurrent patellar instability. Classification: Subluxation: Patella sits […]

Osteochondritis Dissecans of the Knee

Basics Description A pathologic joint entity of localized bone necrosis with overlying cartilage injury Osteochondritis dissecans primarily affects the knee, but it is also seen in the hip (in late Legg-Calve-Perthes disease), elbow, and ankle. Osteochondritis dissecans occurs primarily in the 2nd decade of life, but it also is seen in children and older […]