Internal Derangement: I urge you to seek UC evaluation as this may be a patella fracture or an internal derangement inside the knee joint mechanically restricting the normal hinge motion of the joint. Most commonly a meniscus or ACL tear or both! Are you a soccer player or collision sport athlete? A traumatic knee effusion can restrict ROM and be a sign of avulsion fracture. Rest, ice, compression, elevation...now!
Answered 10/24/2017
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