FABS Quiz 6

What are the three joints in the wrist?

Radiocarpal, midcarpal, and intercarpal

What are the 6 key ligaments of the wrist?

Radial collateral, ulnar collateral, palmer radiocarpal, palmar ulnocarpal, lateral, and medial

How many degrees of freedom does the wrist have?

Two degrees of freedom

How many degrees of flexion does the wrist have?

65-80

How many degrees of extension does the wrist have?

55-70

How many degrees of ulnar deviation does the wrist have?

30

How many degrees of radial deviation does the wrist have?

15

What makes up the central column of the wrist?

3rd metacarpal, capitate, lunate, and radius

What is the open-chain flexion movement of the wrist in the radiocarpal joint?

Convex lunate on concave radius

What ligament checks flexion at the radiocarpal joint?

Dorsal radiocarpal

What is the open-chain flexion movement of the wrist in the midcarpal joint?

Convex capitate on concave lunate

What ligament checks flexion at the midcarpal joint?

Dorsal intermediate

What is the open-chain ulnar deviation movement of the wrist in the radiocarpal joint?

Convex triquetrolunoscaphoid on concave radius

What ligament checks ulnar deviation at the radiocarpal joint?

lateral collateral and palmar ulnocarpal

What is the open-chain ulnar deviation movement of the wrist in the midcarpal joint?

Convex capitate on concave lunate

What ligament check ulnar deviation at the midcarpal joint?

lateral ligament of palmar, intercarpal of palmar long ligament

What ligaments check for ulnar deviation?

Radial collateral, lateral , and palmar ulnocarpal

What ligaments check for radial deviation?

Ulnar collateral, medial, and palmar radiocarpal

What compartment is for extension and radial deviation?

lateral

What compartment is for flexion and ulnar deviation?

Medial

What are the primary wrist extensors?

Extensor carpi radialis longus and brevis, extensor carpi ulnaris

What are the secondary wrist extensors?

Extensor digitorum, extensor indicis, extensor digiti minimi, extensor pollicis longus

What are the primary wrist flexors?

Flexor carpi radialis, flexor carpi ulnaris, palmaris longus

What are the secondary wrist flexors?

Flexor digitorum superficialis and profundus, flexor pollicis longus

What is the function of Listers tubercle on radius (AKA dorsal tubercle)

Holds EPL in place

What are the radial deviators of the wrist?

Extensor carpi radialis longus and brevis, flexor carpi radialis, extensor pollicis longus and brevis, flexor pollicis longus, abductor pollicis longus

What are the ulnar deviators of the wrist?

Extensor carpi ulnaris and flexor carpi ulnaris

What traumatic injuries of the wrist can result of a FOOSH?

Fractures of distal ulna and radius, impaction fracture, styloid fracture

What traumatic injuries of the wrist can result of a scaphoid fracture?

Blood supply from radial artery, enters distally into scaphoid

What is the most common bone to be fractured?

Scaphoid

What does avascular necrosis of the scaphoid mean?

No blood to scaphoid

What is the most common bone to be subluxated?

Lunate

What can avascular necrosis of the lunate lead to?

Kienboch’s disease

Where is the typical place for a ganglion cyst to form?

Dorsum of wrist

What makes the floor of the carpal tunnel?

Scaphoid, lunate, triquetrum

What makes the roof of the carpal tunnel?

pisiform and transverse carpal ligament

What are the contents of the carpal tunnel?

Median nerve, tendons of flexor digitorum superficialis and profundus, tendon of flexor carpi radialis, and flexor pollicis longus

What ligament in the carpal tunnel is isolated?

Tendon on flexor carpi radialis

What are the causes of carpal tunnel syndrome?

injury, overuse leads to swollenness of synovial sheath causing impingement of median nerve

What are the boundaries of the tunnel of Guyon?

triquetrum, pisiform, hamate, hook of hamate, and ligament that connects them

What are the content of the tunnel of Guyon?

Ulnar nerve and artery passes through

What kind of joint in the 1st carpometacarpal (CMC) joint?

Saddle joint

What joint shape motion occurs during ab/adduction of the 1st CMC joint?

Convex on Concave

What joint shape motion occurs during flexion and extension of the 1st CMC joint?

Concave on Convex

How many degrees of freedom does the 1st CMC joint have?

Two degrees of freedom

How many degrees of abduction does the 1st CMC joint have?

45

How many degrees of flexion does the 1st CMC joint have?

45

How many degrees of extension does the 1st CMC joint have?

10

In the 1st CMC joint, what shape is palmar to dorsal?

Concave

In the 1st metacarpal, what shape is lateral to medial?

Convex

In the trapezium, what shape is lateral to medial?

Concave

In the trapezium, what shape is palmar to dorsal?

Convex

What joint shape motion occurs during flexion of the 1st CMC joint?

Concave on Convex

What joint shape motion occurs during extension of the 1st CMC joint?

Concave on convex

What joint shape motion occurs during ab/adduction of the 1st CMC joint?

Convex on concave

What occurs during the first phase of opposition of the 1st CMC?

Abduction of thumb

What occurs during the second phase of opposition of the 1st CMC?

Flexion of thumb and finger

What kind of joint is the MCP?

Condyloid joint, 2 degrees of freedom (Except 1st MCP)

What is the joint shape movement of the MCP?

Concave proximal phalange on concave metacarpal

PIPs and DIPs are what kind of joint?

Hinge joints

What muscles control abduction at MCP?

Dorsal interossei

What muscles control adduction at MCP?

Palmar interossei

What are the roles of lumbricals, dorsal and palmar interosseii

Flexion and MCP, extension at PIP and DIP