Thigh knee joint soreness and pain, mainly consider the following aspects: 1, knee synovitis is common in cold or strain, manifested as knee joint soreness and discomfort some patients involved in the thigh muscles. The presence of metabolic waste can produce aseptic inflammation, leading to synovial edema pain, swelling and discomfort in and around the knee joint. 2, thigh muscle fasciitis, common in young patients after a lot of exercise, the thigh muscle tendons are mostly placed around the knee joint, after strenuous exercise to produce lactic acid and lead to aseptic inflammation of the tendons. 3. Meniscal damage to the knee joint, joint wear and tear and sprain leading to meniscal damage, causing fluid accumulation in the knee joint and soreness and swelling of the knee joint, accompanied by soreness and discomfort in the thigh and knee joint when walking, can be clearly diagnosed by MRI examination.