RAD 101 UNIT 4 Anatomy of Fingers, Hand, and Wrist

Phalanges

14 bones of the fingers

Distal Phalanges

Middle Phalanges

Proximal phalanges

Metacarpals

5 long, thin bones that form the palm of the hand

Carpals

wrist bones

Joint of the thumb

interphalangeal (IP) joint

Distal interphalangeal (DIP) joint

Proximal Interphalangeal (PIP) Joint

Metacarpophalangeal (MCP) joint

Trapezium

Trapeziod

Capitate

Hamate

Scaphoid

Lunate

Triquetrum

Pisform

Which carpals are more lateral?

Trapezium and Scaphoid

Which carpals are more medial?

Hamate and Pisform

Carpal Sulcus

canal

Ulnar Deviation Wrist

Lateral Wrist

Tuft/Burst Fracture

comminuted fracture of the distal phalanx may be caused by a crushing blow to the distal finger or thumb

Avulsion Fractures

-Severe stress to a tendon or ligament in a joint region.

-A fragment of bone is separated or pulled away by the attached tendon or ligament.

Boxer's fracture

-Usually involves the distal fifth metacarpal, with an apex posterior angulation best demonstrated on the lateral view.

-Often results when a patient punches someone or something

Bennett's fracture

longitudinal fracture which occurs at the base of the first metacarpal with the fracture line entering the carpometacarpal joint,

generally also includes posterior dislocation or subluxation

Colles Fracture

fracture of the wrist in which the distal radius is fractures with the distal fragment displaced posteriorly.

May result from a forward fall on an outstretched arm (FOOSH injury)

Smith Fracture (reverse Colles)

This fracture of the wrist occurs with the distal fragment of the radius is displaced anteriorly.

Commonly results from a backward fall on an outstretch arm

Hutchinson (Chauffeur)

intra-articular fracture of the radial styloid process