Knee pop: Four ligaments stabilize the knee: anterior cruciate (ACL,) posterior cruciate (PCL,) medial collateral (MCL,) and the lateral collateral (LCL.) Impact injury or abrupt tear in any of these ligaments may cause the knee to pop, depending on the circumstances of the injury. Meniscal (acts as cushion) injury, illiotibial band, hamstring injury. Description suggests MCL injury-See your orthopedist-
Answered 3/1/2019
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