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Infrapatellar Tendinitis

(Jumper’s Knee; Sinding-Larsen-Johansson Syndrome)

By

Frank Pessler

, MD, PhD, Helmholtz Centre for Infection Research

Last full review/revision Oct 2020| Content last modified Oct 2020
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Infrapatellar tendinitis is inflammation of the tendon under the kneecap (patella) caused by overuse of the knees.

Infrapatellar tendinitis typically affects children aged 10 to 13. It is caused by injury due to physical activities that require jumping and the repetitive use of the knees such as figure skating and basketball or volleyball. The overuse of the knees causes very small tears and inflammation to occur in the tendon under the kneecap (patella).

This disorder causes knee pain and tenderness of the tendon under the kneecap. The pain is worst when straightening the knee while climbing stairs, jumping, or doing knee bends.

To relieve the pain, children are told to modify their athletic activities, take nonsteroidal anti-inflammatory drugs (NSAIDs), and do physical therapy Physical Therapy (PT) Physical therapy, a component of rehabilitation, involves exercising and manipulating the body with an emphasis on the back, upper arms, and legs. It can improve joint and muscle function, helping... read more . Persistent pain may be treated with surgical repair, but this is usually not necessary.

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