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Compared with anterior cruciate ligament injuries, posterior cruciate ligament injuries are a rare event. The mechanisms are predictable and a thorough physical examination is mandatory to rule out or define combined injury patterns. Stress radiography and magnetic resonance imaging studies are very helpful adjuncts. Acute and chronic injuries require slightly different approaches. As our understanding of normal and pathologic knee joint kinematics develops, nonoperative rehabilitation goals and operative techniques continue to evolve.