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:''Not to be confused with Runner's knee which often affects runners; or Sinding-Larsen and Johansson syndrome and Osgood-Schlatter disease which primarily affect young athletes.'' Patellar tendinitis (patellar tendinopathy, also known as jumper's knee), is a relatively common cause of pain in the inferior patellar region in athletes. It is common with frequent jumping and studies have shown it may be associated with stiff ankle movement and ankle sprains.〔http://www.nlm.nih.gov/medlineplus/news/fullstory_117344.html〕 ==Presentation== 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 the patellar tendon where it attaches to the patella and may progress by tearing or degenerating the tendon. Patients present with an ache over the patella tendon. Most patients are between 10 and 16 years old. Magnetic resonance imaging can reveal edema (increased T2 signal intensity) in the proximal aspect of the patellar tendon. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Patellar tendinitis」の詳細全文を読む スポンサード リンク
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