The bones of the lower extremities consist mainly of the pelvis, femur, patella, tibia, fibula, and foot bones, which can be divided into talus, heel, tarsus, toe, and metatarsus. The lower extremity bones are usually subject to local deformities, such as inversion deformity of the knee joint, valgus deformity of the knee joint, and congenital pelvic tilt. The main role of the lower extremity bones is weight bearing and walking, and most of the joints are stable and prone to degenerative changes, such as osteoarthritis. Therefore, patients should usually strengthen the muscle strength training of the lower limbs to enhance the stability of the lower limb bones as well as joints and protect the lower limb bones and joints. Preventing the occurrence of injury to the joints and delaying the degeneration of the joints will be of great benefit to the patient’s normal life assurance.