Causes
Injuries of the forearm with compression of the nerve is the most common cause: examples include supracondylar fractures, often associated with haemorrhage into the deep musculature; injury secondary to open reduction of a forearm fracture; or dislocation of the elbow.
Direct trauma from a penetrating injury such as a stab wound is a common cause for the syndrome.
Fibrous bands or arcuate ligaments may entrap the median as well as the anterior interosseous nerves, in which case a patient may experience numbness as well as pain.
Rheumatoid disease and gouty arthritis may be a predisposing factor in anterior interosseous nerve entrapment.
Very similar syndromes can be caused by more proximal lesions, such as brachial plexus neuritis.
Anterior interosseous nerve entrapment or compression injury remains a difficult clinical diagnosis because it is mainly a motor nerve and the syndrome is often mistaken for finger ligamentous injury.
Read more about this topic: Anterior Interosseous Syndrome