Dislocation of the Kneecap

髌骨（kneecap）是覆盖膝关节并保护它的骨骼。其主要工作是帮助Quadriceps（Front Thigh肌肉）完成矫直腿的动作。虽然髌骨是可移动的，但它保持在适当位置，因为它坐在股骨末端（Thighbone）的凹槽上。如果髌骨从该凹槽中移动，则发生称为髌骨不稳定性的损伤。

Patella instability is also called kneecap dislocation. There are two types:

• 创伤髌骨脱位这是kneecap完全从凹槽移动时。如果您在播放运动时突然改变方向或处于活动状态，可能会发生创伤髌骨位错。
• 慢性帕特尔lar instability. Also called patellar subluxation, this is when the kneecap partially slides out of the groove. Injury to the ligaments or muscles surrounding the knee can cause chronic patellar instability.

Symptoms, Diagnosis and Outlook

通过髌骨不稳定，膝盖圈通常朝向腿的外部移动。其他迹象和症状包括令人变形的膝盖，难以矫直腿（或者你不能伸直它），膝关节疼痛和膝盖肿胀。

Untreated patella instability causes damage to the knee joint and increases your risk for osteoarthritis, making it important to see your doctor for a diagnosis even if the pain isn’t severe. He or she will perform a physical exam and order an X-ray to look at the location of the kneecap.

With the right treatment and rehabilitation, the function of your knee can be restored. Mild cases of patella instability can heal with a few weeks of rest and physical therapy. Repeat cases and severe cases that cause damage to the cartilage or ligament often require surgery.

Why Choose Penn State Health for Care

Top-Ranked by U.S. News & World Report

118金宝搏抽水Penn State Health包括Milton S. Hershey Medical Center，被美国新闻和世界报告排名为该国最好的骨科提供商之一。赢得了这种荣誉，因为我们的医生通过他们对先进治疗，翻译研究和提供商培训的承诺来始终如一地提供特殊的患者护理和结果。

协调，专业护理通过专门的研究所

Our orthopaedic specialists work together through our dedicated Penn State Bone and Joint Institute. There, they focus on providing you with multidisciplinary, tailored care and state-of-the-art treatments and technologies. This produces the highest-quality patient outcomes. All physicians at the institute are fellowship-trained and subspecialize in additional niche areas of orthopaedics, including arthritis care and joint arthroplasty (joint replacement surgery).

Designated as a Blue Distinction® Center

Penn State Bone and Joint Institute is a Blue Distinction Center for Knee and Hip Replacement. This superior designation from BlueCross BlueShield is only given to health care facilities and providers that stand out for their expertise in delivering specialty knee and hip replacement care. Our surgeons specialize in a range of pain-relieving procedures, including partial knee replacement, total joint arthroplasty, joint preservation surgery and complex revision surgery. They perform more than 1,000 joint replacement procedures every year.

Confidence in Treatment Through Education

We developed a specialjoint replacement education websitejust for patients undergoing joint arthroplasty. The website takes you step by step through the joint replacement process. From things to consider before choosing surgery to recovery after surgery, you’ll find the information you need to help you feel confident in your decision to undergo joint replacement.

Advancing Orthopaedic Medicine Through Research

The doctors and researchers in our Center for Orthopaedic Research and Translational Science at the Milton S. Hershey Medical Center are committed to advancing our field through scientific discovery and education. As the only academic medical center in central Pennsylvania, Hershey Medical Center is a national leader in research, in partnership with Penn State College of Medicine, and on the leading edge of new treatment options, including clinical trials.

支持团体

支持小组提供了与正在经历类似斗争的其他患者和护理人员与其他患者和护理人员分享自己的感受。

Learn more about support groups offered