Patella Strap (patellar tendinopathy, also known asjumper’s knee), is a relatively common cause of pain in the inferiorpatellarregion in athletes. It is common with frequent jumping and studies have shown it may be associated with stiff ankle movement and ankle sprains.

Jumper’s knee (patellar tendinopathy, patellar tendinosis, patellar tendinitis) commonly occurs in athletes who are involved in jumping sports such as basketball and volleyball. Patients report anterior knee pain, often with an aching quality. The symptom onset is insidious. Rarely is a discrete injury described. Usually, involvement is infrapatellar at or near the infrapatellar pole, but it may also be suprapatellar.

Depending on the duration of symptoms, jumper’s knee can be classified into 1 of 4 stages, as follows:

Stage 1–Pain only after activity, without functional impairment

Stage 2–Pain during and after activity, although the patient is still able to perform satisfactorily in his or her sport

Stage 3–Prolonged pain during and after activity, with increasing difficulty in performing at a satisfactory level

Stage 4–Complete tendon tear requiring surgical repair

It begins as inflammation in thepatellar tendonwhere it attaches to thepatellaand may progress by tearing or degenerating thetendon. Patients present with an ache over the patella tendon. Most patients are between 10 and 16 years old. Magnetic resonance imaging can revealedema(increased T2 signal intensity) in the proximal aspect of the patellar tendon.