Hand Arthokinematics Flashcards
(23 cards)
Function of the hand
Maintain grasp and manipulate objects
Primary source of sensation
How many arches does the hand have?
3
What do the concavities of the hand help with?
Grasping objects
Proximal transverse arch is formed by?
The two rows of carpal bones
Distal transverse arch is formed by?
The MCP joints
Longitudinal arch runs where?
The length of the hand and formed by the shape of the metacarpals and fingers, increases with flexion of hand
Trapezium articulates with
The first metacarpal
Trapezoid articulates with
The second metacarpal
Lunate articulates with
The third metacarpal
Hamate articulates with
The 4th and 5th metacarpals
Carpometacarpal Joints are supported by
Palmar and dorsal CMC ligaments
Where is the central pillar located?
Between the 2nd and 3rd digits
1st carpometacarpal joint allows ..
The thumb to touch all fingers to increase grasp
The design of the 1st carpometacarpal joint allows..
Flexion in a plane that intersects the digits to increase grasp
The 1st carpometacarpal is a
Loose joint capsule with ligaments and muscles increasing stability
1st CMC arthokinematics
Palmar Flexion and extension
Roll and glide in same direction
Palmar abduction and Adduction
Roll and glide in opposite direction
1st CMC - Opposition
MC abducts, then flexes and IRs toward the 5th digit
Full opposition is closed packed position with the ligaments taut
Opposite to reposition
MCP joints 2-5 is
A synovial joint with convex metacarpal and concave phalanx
Has 2 degrees of freedom:
Flexion/Extension
ab/adduction
Typical A/PROM
Structure of the IP joints allow
Flexion - extension
Radial and ulnar collateral ligaments
Palmar plate
joint capsule
When IP joints are injured they are?
Immobilized in extension to decrease risk of flexion contracture
What is the volar plate
Fibrocartilaginous structure attached to proximal phalanx that increases joint congruency and stability
Restricts hypertextnesion and prevents pinching of flexor tendons
