Wrist JointWrist Joint

Wrist JointWrist Joint The radiocarpal joint and the midcarpal The radiocarpal joint and the midcarpal

joint create the wrist. The radiocarpal joint create the wrist. The radiocarpal joint consists of the distal end of the radius joint consists of the distal end of the radius and the radioulnar disk proximally and the and the radioulnar disk proximally and the scaphoid, lunate, and triquetrum distally. scaphoid, lunate, and triquetrum distally.

The midcarpal joints occur beween the two The midcarpal joints occur beween the two rows of carpal bones and contribute to rows of carpal bones and contribute to wrist motion. Their shape is irregular and wrist motion. Their shape is irregular and they are classified as plane joints.they are classified as plane joints.

The carpometacarpal (CMC) joints occur The carpometacarpal (CMC) joints occur beween the distal row of carpal bones and beween the distal row of carpal bones and the proximal end of the metacarpal bones.the proximal end of the metacarpal bones.

Joint motionsJoint motions

FlexionFlexion Neutral positionNeutral position ExtensionExtension Ulnar deviationUlnar deviation Radial deviationRadial deviation

Bones and LandmarksBones and Landmarks

Starting on the thumb-side of the Starting on the thumb-side of the prximal row are the scaphoid, lunate, prximal row are the scaphoid, lunate, triquetrum, and pisiform. In the triquetrum, and pisiform. In the distal row, lateral to medial, are the distal row, lateral to medial, are the trapezium, trapezoid, capitate, and trapezium, trapezoid, capitate, and hamate.hamate.

Muscles of the WristMuscles of the Wrist

Anterior: Anterior: – Flexor carpi ulnaris Flexor carpi ulnaris – Flexor carpi radialisFlexor carpi radialis – Palmaris longusPalmaris longus

Posterior:Posterior:– Extensor carpi radialis longusExtensor carpi radialis longus – Extensor carpi radialis brevisExtensor carpi radialis brevis – Extensor carpi ulnarisExtensor carpi ulnaris

Flexor Carpi UlnarisFlexor Carpi Ulnaris

Flexor Carpi UlnarisFlexor Carpi Ulnaris

O: Medial epicondyle of humerusO: Medial epicondyle of humerus I: Pisiform and base of fifth I: Pisiform and base of fifth

metacarpalmetacarpal A: Wrist flexion, ulnar deviationA: Wrist flexion, ulnar deviation N: Ulnar nerve (C8, T1)N: Ulnar nerve (C8, T1)

Flexor Carpi Radialis Flexor Carpi Radialis

Flexor Carpi Radialis Flexor Carpi Radialis

O: Medial epicondyle of the humerusO: Medial epicondyle of the humerus I: Base of second and third I: Base of second and third

metacarpalsmetacarpals A: Wrist flexion, radial deviationA: Wrist flexion, radial deviation N: Median nerve (C6, C7)N: Median nerve (C6, C7)

Palmaris LongusPalmaris Longus

Palmaris LongusPalmaris Longus

O: Medial epicondyle of humerusO: Medial epicondyle of humerus I: Palmar fasciaI: Palmar fascia A: Assistive in wrist flexionA: Assistive in wrist flexion N: Median nerve (C6, C7)N: Median nerve (C6, C7)

Extensor Carpi Radialis Extensor Carpi Radialis LongusLongus

Extensor Carpi Radialis Extensor Carpi Radialis LongusLongus

O: Supracondylar ridge of humerus O: Supracondylar ridge of humerus I: Base of second metacarpalI: Base of second metacarpal A: Wrist extension, radial deviationA: Wrist extension, radial deviation N: Radial nerve (C6, C7)N: Radial nerve (C6, C7)

Extensor Carpi Radialis Extensor Carpi Radialis BrevisBrevis

Extensor Carpi Radialis Extensor Carpi Radialis BrevisBrevis

O: Lateral epicondyle of humerusO: Lateral epicondyle of humerus I: Base of third metacarpalI: Base of third metacarpal A: Wrist extensionA: Wrist extension N: Radial nerve (C6, C7)N: Radial nerve (C6, C7)

Extensor Carpi Ulnaris Extensor Carpi Ulnaris

Extensor Carpi Ulnaris Extensor Carpi Ulnaris

O: Lateral epicondyle of humerusO: Lateral epicondyle of humerus I: Base of fifth metacarpalI: Base of fifth metacarpal A: Wrist extension, ulnar deviationA: Wrist extension, ulnar deviation N: Radial nerve (C6, C7)N: Radial nerve (C6, C7)