MSD Manual

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When the Front of the Knee Hurts
PHY_knee_hurts_sports
When the Front of the Knee Hurts

    Normally, the kneecap (patella) moves up and down the thigh bone during running. People may feel pain in the kneecap because thigh muscles are weak or the feet roll in too much (pronation). As a result, the kneecap rubs abnormally against the thigh bone, causing increased wear and tear.