老李经常觉得膝盖发软,走路时好像不由自主地要跪下去,上下楼梯时更加明显。开始时他以为患了骨质增生,到医院一检查,医生说是髌骨软化症造成的。髌骨软化症是髌骨的软骨损伤引起的退行性变化。造成髌骨软化的原因有很多,如膝关节反复屈伸、扭转,使关节面不断相互撞击、摩擦,引起磨损性伤。老年人动脉硬化、局部血供不足,也是引起此病的原因。 Lao Li often felt his knees soft, walking seems involuntarily to kneel, more obvious when going up and down the stairs. He thought he had a bone hyperplasia at the beginning, went to the hospital for an examination, and the doctor said it was caused by chondromalacia patellae. Chondromalacia patella is a degenerative change caused by cartilage damage of the patella. Patellar softening caused by many reasons, such as repeated knee flexion, torsion, so that articular surfaces continue to impact each other, friction, causing abrasion injury. Arteriosclerosis in the elderly, lack of blood supply is also the cause of the disease.