It means that there: Is something caught between the bones {forming the joint, eg femur (thigh) and leg (tibia)}. It could be a torn meniscus (cartilage) or a loose body (piece of bone/cartilage) causing acute severe pain. The joint locks in about 20-30 degrees of bend (flexion) so that one is not able to extend (straighten) the joint.
Answered 12/29/2013
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