Our expert says:
Orthopaedic Specialist Forum
This can be caused by either "locking" of your knee when part of your cartilage or a loose body becomes jammed between your shin bone and thigh bone. It can also be caused by instability when either your knee cap jumps out of joint or if you have injured your knee cruciate ligament before the whole knee joint shifts out of place.It is important that you get to see an orthopaedic surgeon as you may be doing further damage to the joint.
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