Hand & Wrist Joint Functions Quiz

Study Notes

Hand and Wrist Functions

Provide stability and mobility of the hand in space
Position and rotate the hand
Capable of forming multiple shapes
Skilled hand motions include grasping, pinching, and tactile exploration
Transmit loads to or from external objects to the forearm

Hand and Wrist Bones

Lower arm consists of radius and ulna
Hand consists of carpal bones, metacarpal bones, and fingers
Fingers consist of proximal phalanx, middle phalanx, and distal phalanx

Wrist Articulations

Radiocarpal joint connects radius and carpal bones
Midcarpal joint connects carpal bones
Radioulnar joint connects radius and ulna

Wrist Kinematics

Flexion and extension occur at the radiocarpal joint
Abduction and adduction occur at the midcarpal joint
Forearm pronation and supination occur at the radioulnar joint

Hand Articulations

Carpometacarpal (CMC) joints connect carpals and metacarpals
Metacarpophalangeal (MCP) joints connect metacarpals and proximal phalanx
Interphalangeal (PIP and DIP) joints connect proximal and middle phalanx and middle and distal phalanx

Hand Kinematics

Flexion and extension of finger joints occur at PIP and DIP joints
Flexion, extension, abduction, adduction, and rotation of fingers occur at MCP joints
Flexion, extension, abduction, adduction, rotation, and opposition of thumb occur at CMC joint

Types of Hand Grips

Power grip: forceful grip with fingers flexed and thumb holding object in palm
Precision grip: manipulating small objects between thumb and fingers

Wrist and Hand Muscles

Wrist extensor muscles act with finger flexors
Wrist flexor muscles act with finger extensors

Hand and Wrist Injuries

Acute injuries: wrist and finger sprains, fractures, and dislocations
Colles Fracture: broken wrist caused by direct force applied to the distal radius
Symptoms of Colles Fracture: pain, weakness, swelling, and deformity
Repetitive injuries: carpal tunnel syndrome caused by median nerve irritation
Risk factors for carpal tunnel syndrome: excessive movement of flexor tendons, wrist extension, cold temperatures, and vibrations
Treatment options for carpal tunnel syndrome: brace, physical therapy, and surgery
Sport-specific injuries: vary depending on the sport and activity

Description

Test your knowledge on the functions of the hand and wrist joints, including stability, mobility, and the ability to form multiple shapes. Explore topics like skilled motions, grasping, and load transmission between the hand and forearm.