Knee pain walking leg is straight not dare to bend for the cause of treatment, common causes of knee soft tissue trauma, meniscus injury or arthritis, etc., the treatment method has general treatment, physical therapy, drugs and surgical treatment. 1. Soft tissue trauma: soft tissue trauma of the knee joint due to fall, etc., due to pain when walking, not dare to bend, bed rest, reduce activities to prevent aggravation of the condition, cold compresses to reduce edema within 72 hours, hot compresses to promote blood circulation after 72 hours. 2. Meniscus injury: due to traumatic injuries caused by meniscus injury of the knee, the degree of light bed rest to reduce activities, pain is more serious can take analgesic and anti-inflammatory treatment such as ibuprofen, etc., meniscus tear may require minimally invasive arthroscopic surgery meniscus repair and shaping surgery. 3. Arthritis: including osteoarthritis of the knee, gouty arthritis and rheumatoid arthritis, knee pain, redness, swelling and pain in the walking leg do not dare to bend, can be used to treat the sodium loxoprofen and colchicine and methotrexate and other drugs. Knee pain walking leg is straight not dare to bend the cause is also a lot, such as knee joint free body and knee synovitis, etc., should be timely to the regular hospital, by the doctor according to the specific condition to determine the cause of the disease, according to the cause of the disease to give the correct treatment. The above drugs are recommended to be used under the guidance of a doctor.