Compartments formed by Extensor Retinaculum

Question 1

compartment 1

Answer 1

abductor pollics longus and extensor pollicis brevis

Question 2

compartment 2

Answer 2

extensor carpi radialis longus (insertion at MC II)

extensor carpi radialis brevis (insertion at MC III)

Question 3

compartment 3

Answer 3

EPL

Question 4

compartment 4

Answer 4

extensor digitorum

extensor indicis

Question 5

compartment 5

Answer 5

extensor digiti minimi

Question 6

compartment 6

Answer 6

extensor carpi ulnaris (attaches to the base of the 5th metacarpal)

Question 7

What is the pathology associated with the first extensor compartment?

Answer 7

abductor pollicis longus and extensor pollicis brevis

dQuervain’s tenosynovitis - intense pain on the radial aspect of the wrist and thumb

MAYO CLINIC: “Although the exact cause of de Quervain’s tenosynovitis isn’t known, any activity that relies on repetitive hand or wrist movement — such as working in the garden, playing golf or racket sports, or lifting your baby — can make it worse.”