Cubital Tunnel Syndrome

Question 1

What is the most common site of entrapment in cubital tunnel syndrome?

Answer 1

Between the two heads of FCU is most common; also can be entrapped at arcade of Struthers (hiatus in medial intermuscular septum) and btw Osborne’s ligament and MCL

Question 2

Where does the ulnar nerve enter the posterior compartment of the arm?

Answer 2

8cm proximal to the medial epicondyle

Question 3

Describe Froment sign?

Answer 3

compensatory thumb IP flexion by FPL during key pinch; adductor pollicis is weak d/t ulnar neuropathy

Question 4

What advantage if any does ulnar nerve decompression in situ have versus transposition?

Answer 4

Equal results with less complications

Question 5

Cubital tunnel syndrome is caused by compression of the ulnar nerve between what two structures as it passes posterior to the medial epicondyle?

Answer 5

Osborne’s ligament and MCL

Question 6

Which Struther’s structure is involved in ulnar n. compression?

Answer 6

Arcade of Struthers; point at which ulnar nerve pierces the medial intermuscular septum to travel from the anterior to posterior compartments as it moves distally;
Ligament of Struthers is a fibrous band extending from the supracondylar process of the humerus to the medial epicondyle which can cause compression of the median nerve.