Introduction:

Posterior interosseous nerve syndrome, a branch of the radial nerve at the level of the forearm, is characterized by the motor function loss of some or all of the muscles innervated distally.

Clinical case:

A 26-year-old male with a history of proximal radius fracture associated to radial nerve injury, treated with osteosynthesis 7 years earlier, with full recovery, who currently presented intense pain 4 cm distal to the radial head, accompanied by paralysis of Extensor pollicis longus , Extesnor pollicis brevis and Abductor pollicis longus, with paresis of the Extensor indicis propius , in which a diagnosis of entrapment syndrome of the anterior descending branch of the posterior interosseous nerve (SNIP) was performed.

Discussion:

The conservative management of SNIP is indicated during the first 8-12 weeks, if no improvement is found, the indication for surgical exploration is indicated, and the removal of osteosynthesis material is controversial.