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Patellar Subluxation Syndrome, also known as Patellar instability, or Unstable Kneecap is an injury that is concerned with the kneecap. Patellar subluxation is more common than patellar dislocation and is just as disabling.〔Dr. Ellison, A. E., M.D. et al. 1985. ''Athletic Training and Sports Medicine.'' New York: American Academy of Orthopedic Surgeons. First edition; second printing. ISBN 0-89203-002-X.〕 In this condition, the patella repetitively subluxates and places strain on the medial restraints and excessive stress/tension on the patellofemoral joint. Patellar subluxation can be caused by osseous abnormalities, such as incorrect articulation of the femoral groove with the patella, trochlear dysplasia, or patella alta, which is a distance of greater than 20 mm between the tibial tubercle and the trochlear groove. It can also result from soft-tissue abnormalities, such as a torn medial patellofemoral ligament, or a weakened vastus medialis obliquus.〔() in: 〕 Symptoms are regulated by the amount of activity. Such pain is commonly caused by running and jumping sports and activities〔 that place large forces on the patellofemoral joint. Symptoms usually include:〔()〕 * Knee buckles and can no longer support your weight * Kneecap slips off to the side * Knee catches during movement * Pain in the front of the knee that increases with activity * Pain when sitting * Stiffness * Creaking or cracking sounds during movement * Swelling Patellar subluxation was once thought to occur mainly in women,〔 due to the frequency of genu valgum and lax ligaments. However, now the frequency of this condition in any athletic person, man or woman, is apparent. ==References== 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 subluxation syndrome」の詳細全文を読む スポンサード リンク
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