There is no such thing as the most knee injurious sports; any sports related to the knee joint, overdoing may hurt the knee, but the sports that are more injurious to the knee are mountain climbing, playing soccer, running on the treadmill, and bouncing sports. 1. Mountain climbing: especially downhill, easy to cause knee joint articular cartilage damage, and knee degenerative lesions. 2. Playing soccer: the knee joint bends violently with the rotation, which may cause meniscus injury or ligament strain. 3. Running on the treadmill: the treadmill is a fixed-speed movement, the coordination of movement can not keep up with the machine, it will form a shock injury to the meniscus, cartilage. 4. Bouncing: Repeated sharp turns and stops and rotations can cause more damage to the knee joint and can result in chronic injuries. In normal sports or activities should pay attention to the protection of the knee joint, exercise should first do warm-up exercises, and pay attention to the correct posture, to prevent sports injuries; middle-aged and elderly people can choose to be more soothing walking, jogging, playing Tai Chi and other sports, in the exercise at the same time can also reduce knee injuries. In the exercise process of knee pain aggravation, must promptly go to the hospital for examination, if necessary, consult an orthopedic surgeon, under the guidance of the doctor for exercise.