runners knee

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run′ner's knee′

pain under the kneecap or patella caused by wear of the cartilage in the knee, as in cycling or running.
References in periodicals archive ?
The runners knee is a result of a misaligned kneecap or cartilage tears.
Conditions that can be treated include sprains, hip pain, sciatica, Carpal Tunnel Syndrome, tennis and golfers elbow, runners knee and many others.