Prehension Ox

Question 1

How can patients without ability to flex and oppose thumb function?

Answer 1

Natural Tenodesis

Question 2

Tenodesis function and pattern

Answer 2

• lateral apprehension
• fingers draw closer to thumb with wrist extension

Question 3

Common Postional Ox Goal

Answer 3

3 jaw chuck

Question 4

Common Style

Tenodesis Splints

Answer 4

Ranchos
* Forearm Ext. (dorsal)
* HO with palmar & dorsal bars
* thumb post
* finger pieces

Question 5

Finger component goals

Tenodesis Splints

Answer 5

• allow for tips of 2-3 to touch the thumb
• 3rd digit will be slightly more dorsal than 2nd

Question 6

Wrist

Tenodesis Splints

Answer 6

joint connects forearm and HO

Question 7

Linkage

Tenodesis Splints

Answer 7

Parallelogram Linkage
* opposite bars remain parallel through wrist ROM

Question 8

C Bar

Tenodesis Splints

Answer 8

Not necessary; thumb post and HO maintain webspace
* no natural tightness

may be nice to assist with donning

Question 9

Wrist Driven

Types of Prehension Ox

Answer 9

• prehension driven by wrist extension
• fingers move in direct response to the wrist

Question 10

Ratchet Driven

Types of Prehension Ox

Answer 10

• no prehension with active wrist ROM
• ratchet activated using the bar/rod (locks in the teeth)
• Spring works against the rod (works to open the hand)

Question 10

Ratchet Box

Types of Prehension Ox

Answer 10

alloes prehension in different wrist positions
* more volar = requires less wrist ext.
* more dorsal = requires more wrist ext.

assist in pts with limited wrist ROM

Question 11

Utensil Holder

Answer 11

spring connected around the MCP joint
* provides resistance to holding a utensil