Increased range of motion with the loss of a discrete endpoint indicates a deficient anterior cruciate ligament (ACL).
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Increased anterior translation of the tibia or loss of a discrete endpoint indicates a deficient ACL.
Subluxation of the knee will occur at 20 to 40 degrees of knee flexion if the ACL is deficient.
Patients who complete the crossover hop test without feelings of knee instability may be able to function well without an intact ACL.
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Videos: Anterior Cruciate Ligament Injury: Diagnosis, Management, and Prevention