Ligaments of the Wrist and Hand Flashcards
TFFC characteristics (a fibrocartilage complex) AND Functions
-biconcave fibrocartilage disc
-palmar ulnocarpal ligament
-ulnar collateral lig
FUNCTIONS
-stabilizes DRUJ - binds distal radius and ulna
-provides dual articular surface
-separates radioulnar joint from radiocarpal joint
-cushioning –> ulnar sided force transmission
TFCC injuries
-FOOSH
-extension with ulnar compression
-forced radial or ulnar deviation
-strong distraction
-disc injury from compression and shear
-ligamentous attachment injury from extreme distraction force or extreme radial deviation
Collateral ligs of the MCP joints 2-5
strong, oriented obliquely
max tension: 70 deg flexion
resist: abduction/adduction (along with MC head)
The function of volar plates MCP 2-5
- Ext: increases contact surface with MC head
- Flex: glides prox. / prevents tendon pinching
Transverse carpal lig function
prevents bowstringing of the tendons of the flexor pollicis longus, flexor digitorum superficialis & flexor digitorum profundus muscles
Transverse carpal lig attachments
- from the pisiform & hook of the hamate to scaphoid & trapezium
radiocarpal lig function
stabilizes carpal bones on the radius
radiocarpal lig attachments
dorsal and palmar surface of the distal radius to the first two rows of carpal bones
radial collateral lig of the wrist function
restrain/limit wrist ulnar deviation
radial collateral lig of the wrist attachments
– radial styloid process to the scaphoid
ulnar collateral lig of the wrist function
restrain/limit wrist radial deviation
ulnar collateral lig of the wrist attachments
ulnar styloid process to triquetrum
collateral ligs of the MCP joints function
stabilizes metacarpophalangeal joints
collateral ligs of the MCP joints attachments
from the head of the metacarpals to base of adjacent proximal phalanx
TFCC function
Stabilize distal radio-ulnar and ulnocarpal joints, form concavity on the ulnar side of the wrist AND transfer compressive force from hand/wrist to the forearm
