Upper Limb - Wrist Flashcards
What bones make up the proximal row of carpal bones?
scaphoid
lunate
triquetrum
What bones make up the distal row of the carpal bones?
trapezium
trapezoid
capitate
hamate
Which carpal bone is positioned anteriorly to the triquetrum?
pisiform
Which muscle inserts onto the pisiform?
flexor carpi ulnaris
What is the function of FCU?
flexion and adduction of the wrist
What is the function of the pisiform?
increases the lever arm of the FCU
What provides stability at the wrist joint?
intricate ligaments
precise opposition of multifaceted articular surfaces of carpal bones
Which bones articulate with the distal end of the radius to form the radoiocarpal joint?
scaphoid
lunate
What is interesting about the triquetrum and ulna’s interaction?
they articulate via a triangular shaped inter-articular disc which occupies the ulnocarpal space
What movements are possible at the wrist joint?
flexion extension adduction abduction circumduction
what degree of flexion is allowed at the wrist?
80-90
what degree of extension is allowed at the wrist?
70-80
How much flexion occurs at the midcarpal joint and at the radiocarpal joint?
60% MC
40% RC
How much extension occurs at the midcarpal joint and at the radoiocarpal joint?
33% MC
67% RC
How much abduction is allowed at the wrist joint?
15-20 degrees
How much adduction is allowed at the wrist joint?
35 degrees
How much flexion extension is required to perform the activities of daily living?
10 degrees flexion
35 degrees extension
As extension capability is lost, what happens to the ability to perform tasks?
reduces - maximum extension is the most important
When fixing wrist joints, what degree of extension allows most activities of daily living to be performed satisfactorily?
15 degrees
