Wrist Hand Orthoses- Thermoplastic And Metal - Rationale, Components, And Orthometry Form

Question 1

Keeping the thumb in opposition is one of the functions of a WHO for individuals with weakened or paralyzed upper extremities. What 3 motions does the thumb component of a WHO resist in pain gaining opposition?

Answer 1

Extension of the CMC joint and hyperextension of the MCP joint

Question 2

3 point pressure systems have a direct force close to a joint and 2 supportive forces away from the joint. What part on a static metal WHO provides the direct force closest to the wrist to resist radial deviation of the hand on the forearm?

Answer 2

Distal ulnar forearm extension

Question 3

The dorsal wrist portion of the metal WHO has a cutout in the pattern to avoid pressure over the:

Answer 3

Ulnar stylus

Question 4

The distal palmar trim line for the plastic WHO is trimmed to:

Answer 4

A point just proximal to the distal palmar crease

Question 5

What anatomical landmark can be used to properly place the mechanical orthotic wrist joint for a hinged wrist hand orthosis?

Answer 5

Radial styloid