24: Radial Neuropathy

Question 1

What does the deep branch of the radial nerve innervate before entering the supinator? How does it enter?

Answer 1

ECRB and supinator muscles;
Under the Arcade of Frohse

Question 2

Causes for radial neuropathy at the spiral groove?

Answer 2

Saturday Night Palsy, strenuous muscular effort, humerus fx, infarction from vasculitis

Question 3

Cause of radial neuropathy in the axilla?

Answer 3

Patients on crutches

Question 4

Five possible sites of compression of PIN?

Answer 4

1. Medial proximal edge of ECRB muscle
2. Fibrous tissue anterior to the radiocapitellar joint b/w brachialis and BR
3. Leash of Henry (recurrent radial vessels)
4. Arcade of Frohse
5. Distal edge of the supinator

Question 5

Bifurcation of the deep and superficial radial branches?

Answer 5

Typically just distal to the elbow joint; sometimes right at the elbow joint