Wrist Flashcards
Allows the wrist and hand to rotate on the radius farther into ulnar deviation than into radial deviation
Ulnar tilt
What is the normal degree for ulnar tilt?
25 degrees
The distal articular surface of the radius is angered about ___ degrees in the palmar direction. This _______ accounts, in part, for greater amounts of flexion than extension in the wrist
10; palmar
Which row of carpal bones is relatively loose? which row is bound tightly by strong ligaments?
proximal; distal (creates a stable base for metacarpal bones)
Arches over the concave carpal bones to form tunnel
Transverse carpal ligament
What is contained in the carpal tunnel?
- median nerve
- 4 tendons of flexor digitorum superficialis
- 4 tendons of flexor digitorum profundus
- tendon of pollicis longus
What prevents contained ligaments from bowstringing anteriorly and out of the carpal tunnel during grasping actions performed with a partially flexed wrist?
transverse carpal ligament
Where is the axis of rotation in the wrist?
Head of capitate (firmly articulated with 3rd metacarpal)
- for both medial-lateral and anterior-posterior
What is the ROM for wrist flexion? extension?
70-85
60-75
- flexion normally exceeds extension by 10-15 degrees
Why does flexion normally exceed extension?
Palmar tilt of radius
What is the ROM for ulnar deviation? Radial deviation?
35-40
15-20
- ulnar deviation usually 2x more than radial deviation due to ulnar tilt of radius
What is the average wrist ROM needed for ADL’s?
40 degrees flexion
40 degrees extension
10 degrees radial deviation
30 degrees ulnar deviation
What is the “position of function” of the wrist (the average position of the wrist during daily activities)?
10-25 degrees extension
10 degrees ulnar deviation
The “position of function” is the position the wrist would be fused or splinted. Why would you fuse the wrist or any joint?
stability and relief of pain
What is the capsular pattern for the radiocarpal joint?
Equal amounts of flexion and extension
What is the close packed position for the radiocarpal joint? open pack?
Extension, radial deviation;
neutral, slight ulnar deviation
Arthrology of the radiocarpal joint: [concave/convex] radius and disc on [concave/convex] scaphoid and lunate
Concave; convex
__% of total force passes through the scaphoid and lunate to the radius
__% of force passes through the articular disc
80%; 20%