Wrist and Hand Structure and Movement Flashcards
What are the carpal bones of the hand (both rows)
Proximal row = scaphoid, lunate, triquetrum, pisiform
Distal row = Trapezium, trapezoid, capitate, hamate
(some lovers try positions that they cannot handle)
What is the most easily fractured bone of the wrist??
The scaphoid - often fracture by forced extension of the wrist during a fall on an outstretched
hand (FOOSH)
The blood supply of the scaphoid is poor. If the fracture is not recognized and managed appropriately, it can heal improperly (non-union) and result in persistent wrist pain
Most easily dislocated bone of the wrist
Lunate - often caused by forced flexion of the wrist during a fall
Articulating bones and the diarthrodial joint subdivision of the midcarpal joint
Articulating bones
* Articulations between the proximal and distal carpal rows
Diarthrodial joint subdivision
* Nonaxial irregular (plane) type synovial
Articulating bones and the diarthrodial joint subdivision of the CMC joint
- 1st (thumb) carpometacarpal joint
- Biaxial saddle type synovial joint
- 2nd-5th CMC joints
- Nonaxial irregular (plane) type synovial joints
Articulating bones and the diarthrodial joint subdivision of the metacarpophalangeal joints
Articulating bones
* Metacarpal heads
* Bases of the proximal phalanges
Diarthrodial joint subdivision
* Biaxial condyloid type synovial joints
3 main ligaments at all MCP and IP joints
Ulnar collateral ligament, radial collateral ligament, and volar (palmar) plate (ligament)
What is the main function of the collateral ligaments of the fingers
Providing mediolateral stability to the MCP and IP joints
Function of the volar (palmar) plate
Prevents excessive extension of the MCP and IP joints
Articulating bones and the diarthrodial joint subdivision of the 1st carpometacarpal joint
Articulating bones
* Trapezium carpal bone
* Base of the first metacarpal
Diarthrodial joint subdivision
* Biaxial saddle type synovial joint
