Injury: Usually this is caused by either a meniscal tear or injury to the cartilage covering the bones of the knee joint.
Answered 4/6/2013
5.2k views
Possibly: Osteochondritis dikseccans. A chip comes out of the back of the knee cap and forms a foreign body that can lock the joint. Also an old injury might. Needs x-ray.
Answered 4/6/2013
5.2k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question