Posterior Interosseous Nerve


- Anatomy:
    - this nerve is deep motor branch of radial nerve & supplies all of extrinsic wrist extensors except for the ECRL;
    - radial nerve enters the anterior compartment of the arm lying deeply between brachialis medially & BR & ECRL laterally;
    - PIN passes thru supinator muscle in its course from anterior to the posterior surface of the forearm;
    - PIN supplies ECRB & supinator before entering arcade of Froshe;
           - this arcade is fibrotendinous structure at proximal origin of supinator;
           - it is the most common site for entrapment of the nerve;
           - this arcade is absent in full term fetuses but is present in 30% of adults & may develop in response to repeated rotary
                     movement of forearm;
           - note: w/ humerus frx it is important to know whether there is radial nerve palsy;
                  - first branches distal to the fracture site will be the ECRB and supinator muscles, and these will be the first muscle to be
                              re-innervated;
    - infront of lateral epicondyle it divides into its 2 terminal branches, superficial radial nerve and the PIN;
    - in 25% of pts, PIN actually touches dorsal aspect of radius opposite bicipital tuberosity;
           - plates placed high on dorsal surface of radius may trap nerve underneath


- Posterior Interosseous Nerve Compression Syndrome:

- Operative Decompression:



The course of the posterior interosseous nerve in relation to the proximal radius: is there a reliable landmark

Anatomic dissections relating the posterior interosseous nerve to the carpus, and the etiology of dorsal wrist ganglion pain.

The terminal branch of posterior interosseous nerve: a useful donor for digital nerve grafting.

Posterior interosseous nerve palsies

Posterior interosseous nerve: an anatomic study of potential nerve grafts.

A study of the posterior interosseous nerve (PIN) and the radial tunnel in 30 Thai cadavers.

Posterior interosseous nerve palsy in a patient with rheumatoid synovitis of the elbow: a case report and review of the literature

Analgesic benefit, functional outcome, and patient satisfaction after partial wrist denervation

Long-Term Follow-Up Evaluation of Denervation of the Wrist.

Anatomic considerations regarding the posterior interosseous nerve at the elbow

Wrist Denervation for Painful Conditions of the Wrist




Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, June 23, 2016 6:48 pm