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Axial proton density sequence (TR = 4383 milliseconds, TE = 26 milliseconds) through the patella in a 15-year-old girl who sustained a patellar dislocation demonstrates an osteochondral fracture of the medial patellar facet (arrow) and a tear of the medial retinaculum and medial patellofemoral ligament at the patellar attachment (arrowhead).
