Knee pain in young people is often caused by trauma to the ligaments and meniscus of the joint. There are two ligaments in the middle of the knee called the cruciate ligaments, and two pieces of cartilage between the upper and lower bones. This is called the meniscus, and there are two sets of ligaments on the inside and outside of the upper and lower bones, called the collateral ligaments. If these ligaments, meniscus injury, rupture, the initial symptoms are very serious, swelling and pain is obvious, flexion and extension restrictions, but rest will be alleviated, many people think the disease is well, unwilling to actively treat, but this will lead to the late, the joint is easy to injury; or easy to “play soft leg”; even some people walking instability; some people Some people will suddenly walk with their legs in a certain curvature and can’t straighten and flex; or the knee joint is repeatedly swollen and painful. These are the results of early ligament and meniscus injuries, and when you think it’s “better”, it’s secretly getting worse. These can be diagnosed early and clearly by MRI. The treatment of this lesion used to require a long incision in the knee, but now we have developed the technology to use “arthroscopic” surgery, which can be done with a few small incisions of one or two centimeters. In addition, you can walk normally within a few days after surgery. Treatment for the elderly: Knee pain in the elderly is mostly due to “degenerative disease”, which is commonly referred to as “aging”, and is actually a breakdown of the meniscus and cartilage inside the joint, and normal secretion disorders. In terms of treatment, some of them can be treated with Chinese herbal medicine, topical application, anti-inflammatory and pain-relieving drugs, physical therapy, etc., which can provide long-term relief. If these conservative treatments are ineffective, some patients can be treated with “arthroscopic” surgery to reduce symptoms by flushing the joints, removing fragmented tissue and inflammatory material, and removing stagnant tissue. For those with significant joint enlargement, narrowing of the joint space on x-ray, or even significant joint inversion or valgus deformity, surgery may be required. For “unicompartmental lesions” – such as simple recurrent pain on the medial or lateral side of the knee – a slightly simpler procedure can be performed to correct the lower extremity force lines of the knee. If the joint space is already narrow on the X-ray, it may eventually need to be treated with “joint replacement” surgery. The joint pain will be relieved and mobility will be improved.