Chapter 18 - Forearm, Wrist and Hand Flashcards
How many bones, joints and ligaments are within the wrist?
Bones = 8
Joints = 20 radiocarpal, intercarpal & carpometacarpal joints
Intercarpal ligaments = 26 named
*also contains 6 or more parts of TFCC
The hand accounts for _____% of UE function.
90
What type of joint is the distal radioulnar joint?
Uniaxial pivot joint (joins dital radius, distal ulnar and TFCC)
What is shape of the distal radius?
concave
What is the capsular pattern of the DRUJ?
Pain at extremes of pronation/supination
What is the resting and closed packed position of the DRUJ?
Resting = 10 supination Closed = 5 supination
What is the TFCC?
Fibrocartilage disk between medial proximal row and distal ulna
What is the function of the TFCC?
- enhance joint congruity
- cushion against compressive forces
What ligaments originate from the TFCC?
- ulnolunate
- ulnotriquetral
- ulnar collateral
- radioulnar
What structures provide support for the TFCC?
- ulnocarpal ligaments
- sheath of ECU tendon
Inferior and superior articular surfaces of the TFCC are ______ and ______.
Smooth and concave
What type of joint is the radiocarpal joint?
Biaxial ellipsoid joint
What is the capsular pattern of the radiocarpal joint?
Flexion and extension equally limited
What are the resting and closed packed position of the radioulnar joint?
Resting = neutral with slight UD Closed = extension with RD
What does the lunate articulate with: medially, laterally, proximally, distally?
Medially = scaphoid Laterally = triquetrum Proximally = convex surface articulates with the radius and TFCC Distally = concave surface articulates with hamate and capitate
