Supinator syndrome

Introduction to supinator muscle syndrome The supinator muscle syndrome is a group of syndromes that are caused by compression when the deep branch of the phrenic nerve passes between the deep and shallow layers of the supinator muscle. The deep branch of the radial nerve is also called the dorsal interosseous nerve of the forearm. Therefore, the disease is also called the dorsal interosseous nerve paralysis of the forearm. Handicraft workers, keyboard operators and some athletes have chronic traumatic inflammation due to excessive use of the forearm extensor. Non-infectious inflammation caused by rheumatoid arthritis can cause hyperplasia, adhesion and scar formation in the supinator tendon. In addition, benign space-occupying lesions in the supinator muscle and abnormalities in the sacral nerve in the supinator muscle can cause the nerve to be overstressed and dysfunctional. basic knowledge The proportion of sickness: 0.8% Susceptible people: no special people Mode of infection: non-infectious Complications: swelling

Cause of supinator syndrome

Handicraft workers, keyboard operators and some athletes have chronic traumatic inflammation due to excessive use of the forearm extensor. Non-infectious inflammation caused by rheumatoid arthritis can cause hyperplasia, adhesion and scar formation in the supinator tendon. In addition, benign space-occupying lesions in the supinator muscle and abnormalities in the sacral nerve in the supinator muscle can cause the nerve to be overstressed and dysfunctional.

Spinal muscle syndrome prevention

Pay attention to the functional exercise of the supinator tendon to reduce the pressure of the supinator tendon.

Complications of supinator syndrome Complications swelling

The supinator muscle syndrome is a group of syndromes that are caused by compression when the deep branch of the phrenic nerve passes between the deep and shallow layers of the supinator muscle.

Symptoms of supinator syndrome Syndrome Common symptoms Elbow swelling, tenderness, swelling and dysfunction of the elbow

Most paralysis is incomplete, only movement disorders, no sensory disturbances, lateral elbow pain and radiation pain, local tenderness is obvious, muscles innervated by deep branch of the radial nerve are short extensor muscles, supinator muscles, ulnar wrist extensors, and extensors Refers to the total muscle, the small finger muscles, the intrinsic extension of the index finger muscles, the lack of strength of the thumb and short extensor muscles, sometimes local swelling or touching the mass.

Examination of supinator syndrome

1, X-ray inspection.

2, EMG examination

The single-issue impulse of motor neurons can cause synchronous contraction of all muscle fibers that are dominated by axons, and the recorded potential is MUP. Under normal circumstances, nerve impulses cause all muscle fibers of a motor unit to be synchronously discharged, producing a MUP; however, this is not the case in denervated muscle fibers, and the sensitivity of the denervated muscle fibers to acetylcholine increases after 2 weeks. Can reach 100 times normal. They spontaneously release the potential, which is the fibrillation potential. Electroencephalography has important diagnostic value for peripheral nerve injury. Abnormalities in EMG can only prove neurogenic damage, while changes in electroencephalography make lesion localization more pronounced. MCV is sensitive to peripheral nerve trauma and is associated with easy injury to the fibrous fiber.

Diagnosis and diagnosis of supinator muscle syndrome Diagnostic imaging diagnostic X-ray examination: local density reduction (lipoma), or ankle bone changes, have a reference significance.

Differential diagnosis

Ulnar nerve injury

After the ulnar nerve was injured, in addition to the sensation of the skin on the ulnar side of the hand, the metacarpophalangeal joint of the ring and the little finger was overextended, and the interphalangeal joint was flexed in a claw shape. The thumb cannot be adducted, and the other four fingers cannot be outreached and adducted.

2. Median nerve injury

The supracondylar fracture of the humerus can cause a crush injury of the median nerve, and it can often recover spontaneously after the fracture is reset. After the injury, the thumb, the middle finger and the middle finger can not be flexed, the thumb can not be abducted and the palm, and the three fingers of the palm side of the hand feel the obstacle.

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