Subluxation on twisting, turning, or pivoting; some patients can feel this coming on, while other patients are not able to feel it and may experience frequent falls due to their injury.

Positive Lachman's test, anterior drawer test, and pivot shift test on physical examination.

True dynamic instability is rare, unless it is a complete tear or associated with other injuries. Tenderness over medial collateral ligament (MCL) course/insertion may be present. MCL stress testing reveals laxity and/or pain.

Patient is often able to continue activity but notes that the knee does not feel right.

Instability may be more subtle, with knee effusion typically small and less noticeable. In addition, the posterior drawer test is positive.

Local swelling is common, but significant effusion is rare. There is tenderness over the lateral collateral ligament (LCL) and/or bony insertion.

A complete tear often results in a palpable gap. [18]

A joint condition in which some parts of the joint cartilage and bone lose their blood supply due to an unknown aetiology, and may detach from the joint surface. Adolescents are commonly affected. May present with knee pain and swelling. Catching of the knee can occur, especially during or after sporting activity.

Caused by a twisted knee, usually occurring during sporting activity. Presents with knee pain, swelling, and catching. The osteochondral fragment is detached. The medial femoral condyle is frequently involved.