The significance of rehabilitation exercises: bone and joint injury injury leads to loss of limb function, early because of the focus on the injury itself for treatment, functional problems are temporarily in a secondary position. Late with the healing of the injury, functional impairment again becomes the main conflict. No matter early or late, the important influence of exercise on function should not be neglected. (1) Benefit swelling: Trauma leads to local bleeding and edema, and venous and lymphatic return obstruction aggravates edema. The spasm and activity of muscles are reduced, so that the chirping effect of muscles on venous return disappears. The contraction exercise of muscle can increase the blood circulation of the injured limb, and the chirping action of muscle increases the venous and lymphatic return, which promotes the edema to subside. (2) Promote fracture healing: the increase of local blood provides a good blood transport basis for the healing of the fracture end. Due to the contraction activity of muscles the fracture end can produce micro-motion, these slight abnormal activities can stimulate the fracture end to produce a large amount of bone scab, which is beneficial to the healing. Longitudinal compression of the fracture end can bring the fracture end into close contact and accelerate fracture healing. In the later stages of fracture healing, a certain amount of physiological stress on the limb can promote scab shaping and make it more biomechanical. Early joint movement in intra-articular fractures can shape the joint, which is meaningful for restoring the mobility of the joint surface. (3) Reduce joint stiffness: The causes of joint dysfunction are multiple. After the fracture, the damaged joint or adjacent joints are under long-term braking or reduced activity, the cartilage is not extruded, and together with the reduced formation of joint fluid, the articular cartilage loses nourishment and becomes necrotic and detached. The necrotic cartilage pieces in the joint cavity lead to a large amount of leukocyte exudation and release of inflammatory mediators, which aggravate the congestion, edema, and exudation of the synovial membrane and worsen the joint adhesions. Muscle adhesions at the fracture site are another cause of joint dysfunction. The adhesions lose the normal contraction of the muscles, resulting in impaired joint movement. Early rehabilitation exercises can minimize the occurrence of joint and muscle adhesions. (4) Reduce the degree of muscle atrophy and muscle strength loss: regardless of the cause of the loss of joint movement function, it can lead to different degrees of muscle atrophy. Functional exercise can reduce the degree of muscle atrophy and restore normal muscle strength as soon as possible, and can always maintain the central nervous system’s innervation of the relevant muscles, without the need to rebuild this relationship once the fixation is released. (5) Reduce bedridden complications: it can prevent complications such as decubitus ulcers, skin pressure ulcers, urinary tract infections, and deep vein thrombosis of the lower limbs. (6) Promote the recovery of neuromuscular reflexes and coordination functions: for example, after artificial hip and knee joint replacement, training such as proprioceptive training can help the recovery of lower limb joint balance and coordination. The concept of modern orthopedic treatment has changed Early, scientific and continuous postoperative rehabilitation exercises are of great significance for the functional recovery of patients.