For patients with spinal cord injury who have had surgery for more than a month during the acute phase, we should pay attention to the normal and effective functional range of motion of the joint when doing passive joint activities to avoid affecting the stability of the spinal structure. The normal range of hip abduction is 45 degrees and the effective range of motion is 20 degrees. The structural characteristics of the thoracolumbar segment (generally referred to as thoracic 12 to lumbar 1, or thoracic 11 to lumbar 1 vertebrae): ① the upper part is more fixed thoracic vertebrae, the thoracolumbar segment becomes the transition point between the active lumbar vertebrae and the fixed thoracic vertebrae, and the trunk activity stress is easily concentrated here; ② the thoracic vertebrae physiological posterior protrusion, the lumbar vertebrae physiological anterior protrusion, the thoracolumbar segment is the articulation point of the two curvatures, and the shoulder and back weight stress is easily concentrated here; ③ the orientation of the articular surface of the joint synapses in the thoracolumbar segment (3) The orientation of the articular surface of the arthrosis is in the thoracolumbar segment. The displacement of small joints is concentrated in 3 planes, of which 52% are in the thoracic 11-12. The angle of hip flexion can also affect the physiological curvature of the thoracolumbar spine, so it is important to fully understand the internal fixation of the spine before exercising and to consult with the physician who performed the spine surgery if necessary. The main purpose of passive joint movement is to avoid joint contracture. In the case of lower thoracic fractures, hip flexion and knee flexion should be controlled within the pain-free range and should not cause lumbar spine movement (Practical Rehabilitation Medicine [Revised]). Of course, only sufficient hip flexion (up to or over 90 degrees) and extension of the N cord muscles (retraction exercises need special emphasis) make it possible for the patient to sit independently in bed, which is the basis for all kinds of transfer training. However, the lower extremity should not exceed 45 degrees in forward flexion. The patient’s fracture type and spinal fixation method itself greatly affects the time point for sitting up training, e.g., the posterior approach for surgical internal fixation usually requires more than one month for sitting up rehabilitation, but can be advanced by two weeks if the patient is suitable and the thoracoscopic approach is used for internal fixation, both of which require protective bracing early on. Excessive movement will also affect the balance of the spine when doing joint mobility training. Therefore, patients with spinal cord injuries should have early joint mobility exercises and isometric strength training in a range of motion to prevent re-injury.