Nerve compression

Question 1

Sites of median nerve compression (SPLAT)

Answer 1

Supracondylar process/Ligament of Struthers
Pronator teres (deep head)
Lacertus fibrosus
Aponeurosis of FDS
TCL

Question 2

Cutoff for Semmes weinstein testing

Answer 2

2.83 monofilament

Question 3

What is Martin Gruber anastomosis

Answer 3

AIN axons connect to ulnar nerve (motor axons)
Will have intrinsic weakness only with AIN compression
(Incomplete AIN palsy)

Question 4

AIN sites of compression (FAT PAL)

Answer 4

FDS arcade
Accessory FPL head
Thrombosed artery
Pronator head
Aberrant muscle
Lacertus fibrosus

Question 5

Sites of pronator syndrome compression (PALLS)

Answer 5

Pronator heads
Aponeurosis of FDS
Ligament of struthers
Lacertus fibrosus
Supracondylar process

Question 6

How to differentiate pronator syndrome from CTS

Answer 6

Numbness in palm with pronator syndrome

Question 7

Sites of PIN compression (FLEAS)

Answer 7

Fibrous tissue anterior to RC joint
Leash of Henry (radial recurrent vessels)
ECRB edge
Arcade of Frohse (prox edge of supinator)
Supinator distal edge

Question 8

Sites of ulnar nerve compression (OAF)

Answer 8

Osborne’s ligament (ME to olec) + MCL
Arcade of struthers (hiatus in IM septum)
FCU heads/fascia

Also:
Triceps head
Medial epicondyle
Anconeus epitrochlearis

Question 9

How to differentiate cubital tunnel vs. Guyon’s canal ulnar nerve compression

Answer 9

Dorsal hand numbness with cubital tunnel