Arm Lesions

Question 1

Compression in axilla from crutches

Answer 1

Radial nerve

Question 2

Fracture of surgical neck of humerus, dislocation of humerus or IM injection.

Answer 2

Axillary nerve and anterior and posterior circumflex arteries (from Axillary artery).

Question 3

Midshaft fracture of humerus.

Answer 3

Radial nerve and deep brachial artery.

Question 4

Subluxation of radius

Answer 4

Radial nerve deep branch

Question 5

supracondylar fracture of humerus

Answer 5

Median nerve (thenar flattening) and brachial artery.

Question 6

Fracture of the medial epicondyle of humerus

Answer 6

Ulnar nerve

Question 7

Carpal tunnel syndrome or dislocated lunate

Answer 7

Median nerve

Question 8

Fracture of hook of hamate

Answer 8

Ulnar nerve

Question 9

Compression by cervical rib or pancoast tumor or sudden upward pull on arm.

Answer 9

Lower trunk (median and ulnar)

Question 10

Entrapment at Guyon’s canal

Answer 10

Ulnar nerve –> no addiction/abduction of digits, extending little finger.

Question 11

Cubical tunnel syndrome

Answer 11

Compression of the ulnar nerve usually at the medial elbow.