- 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:
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.
Anatomic dissections relating the posterior interosseous nerve to the carpus, and the etiology of dorsal wrist ganglion pain.
Year Book: Posterior Interosseous Nerve Palsies. Cravens-G. Kline-DG. Neurosurgery. 1990. 27. pp 397-402.
Posterior interosseous nerve palsy in a patient with rheumatoid synovitis of the elbow: a case report and review of the literature.
JG Westkaemper MD et al . J. Hand Surgery. Vol 24-A No 4. July 1999. p 727.
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
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