4 The wrist and hand joints Flashcards
What is the wrist joint?
The radiocarpal joint
What type of joint is the radiocarpal joint?
Synovial condyloid joint
What forms the radiocarpal joint?
Proximally - distal end of radius and articular disk
Distally - proximal row of carpal bones except pisiform
Is the ulnar part of the wrist joint?
No due to an articulating disk (fibrocartliaginous ligament) over superior surface of ulna
What type of surface to carpal bones form?
Convex
Does radiocarpal joint have a joint capsule?
Yes, two layers
Fibrous (outer) layer
Synovial membranous (internal) layer
How many signifacnt radiocarpal joint ligaments are there?
4
Palmar radiocarpal
Dorsal radiocarpal
Ulnar collateral
Radial collateral
Where is the palmar radiocarpal ligament?
Palmar (anterior) side of hand, from radius to both rows of carpal bones
What is the purpose of the palmar radiocarpal ligament?
Increase stability of radiocarpal joint
Ensure hand follows forearm in supination
Where is the dorsal radiocarpal ligament?
Dorsal (posterior) side of hand, from radius to both rows of carpal bones
What is the purpose of the dorsal radiocarpal ligament?
Increase stability of radiocarpal joint
Ensure hand follows forearm in pronation
Where is the ulnar collateral ligament?
From styloid process of ulna to triquetrim and pisiform
Where is the radial collateral ligament?
From styloid process of radius to scaphoid and trapezium
What is the purpose of the ulna collateral ligament?
With radial collateral ligament to prevent excessive lateral joint displacement
What is the purpose of the radial collateral ligament?
With ulna collateral ligament to prevent excessive medial joint displacement
