A member asked:

What could cause my knee to have so much pain? my knee keeps giving out and locks up. its shooting pains up my thigh and into my calf. its very swollen and it even hurts to walk.

3 doctors weighed in across 2 answers
Dr. James McClurg answered

Specializes in Orthopedic Surgery

Several : Several things can be causing your problem. The most common factors include a meniscal tear, loose bodies in your knee, flaps of cartilage impinging on motion and even pathologic plicas. Your condition is likely surgical based on your description of problems.

Answered 10/3/2016

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Meniscus tear.: You may have a meniscus tear or a loose body floating around in the knee joint. See an orthopedic knee specialist for evaluation.

Answered 9/10/2014

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