Elbow canal syndrome is a chronic injury of the ulnar nerve in the ulnar nerve sulcus of the elbow and is more common. Common etiologies: Elbow valgus is mild. It can develop after decades, while in severe cases it can develop within a year. Ulnar nerve subluxation, fracture of the humeral epicondyle, if the fracture block is displaced downward, can also compress the ulnar nerve; traumatic ossification (the elbow joint is the most prone to traumatic ossifying myositis), local bone overgrowth, and other causes. The signs and symptoms of elbow canal syndrome are as follows: 1. Abnormal sensation on the ulnar side of the dorsum of the hand, the small fissure, the little finger and the ulnar side of the ring finger, usually numbness or tingling. 2. Following the occurrence of sensory abnormalities for a certain period of time, weakness of the little finger to the palm and inflexible finger retraction may occur. 3.Examination may show atrophy of the interosseous and interosseous muscles of the hand, and orthogonal claw-like deformity of the ring and little fingers, hyperalgesia of the skin in the aforementioned areas, positive paper-clip test (hold a piece of paper between the two fingers of both hands, and observe whether the force of the paper-clip is the same on both sides of the patient) and positive Tinel’s sign at the ulnar nerve sulcus (tap the site of nerve alignment locally to observe whether there is pain and numbness of nerve conduction). The patient’s nerve was found to be positive. 4. Electrophysiological examination revealed that the conduction velocity of the ulnar nerve under the elbow was slowed, and the electromyography of the interosseous muscle and the interosseous muscle was abnormal. 5.The underlying disease manifestations such as elbow valgus, thickening of the ulnar nerve sulcus, and masses, etc. X-rays show local displaced bone or abnormal ossification. The main difference is that in cervical spondylosis, there is no abnormal finding in the elbow canal area, and the tinel sign is negative, and MRI of cervical spine shows stenosis of intervertebral foramen in the corresponding segment of cervical spine. 2, nerve sheath meningioma: elbow ulnar nerve sheath meningioma and elbow canal syndrome have the same performance, examination can mostly find segmental thickening of the ulnar nerve, Tinel sign positive, but no elbow osteoarthritis lesions, sometimes difficult to differentiate need to come back to the diagnosis during surgery or by pathological examination. Anterior transposition of the ulnar nerve is the basic treatment. If the segment of the ulnar nerve is found to be stiff intraoperatively, the outer membrane of the nerve should be removed and interfascicular release should be performed to completely resolve the problem. Normal sensation can be restored more quickly after surgery, but most of the muscles that have been significantly atrophied are more difficult to restore normal volume. Appropriate and reasonable postoperative functional strength training is essential. Treatment with neurotrophic drugs is also available.