UEpx Flashcards by Allie Peterson

6 common grip styles

Cylindrical grasp
Tip (hook TD)
Hook/snap
Palmer (hand TD) (most common for picking up objects and hold use)
Spherical
Lateral (hook TD)

How well did you know this?

Not at all

Perfectly

Advantages and disadvantages Hook TD

Adv:
Light weight
Can see object
Mechanically simple
Versatile 
Easy to use
Disadvantage: 
Uncosmetic

How well did you know this?

Not at all

Perfectly

Advantages vs Disadvantage hand TD

Advantages:
Cosmetic 
Grasp some round objects
Disadvantages: 
Heavier
Difficult to open
More difficult to see objects 
Mechanically complex
Hard to put into pocket
Less versatile

How well did you know this?

Not at all

Perfectly

Lyre shape

Straight approach
Top approach to object
Can’t see as well
Object is being pinched

How well did you know this?

Not at all

Perfectly

What is the difference b/w a pair of outside locking hinges and a pair of flail arm hinges

Flail arm hinges utilizes a spring loaded joint on the lateral side

How well did you know this?

Not at all

Perfectly

Polycentric hinges are used for?

Minimize bunching in the cubital fold- very short /short BE

How well did you know this?

Not at all

Perfectly

What advantage is gained using variable ration step up hinges

Very short TR amputee are able to flex the px forearm a full 135 degrees

How well did you know this?

Not at all

Perfectly

The above elbow control cable must always

Pass in front of the elbow center

How well did you know this?

Not at all

Perfectly

The lever type excursion amplifier provides increased excursion at the expense of:

Force

How well did you know this?

Not at all

Perfectly

Basic harness for shoulder amputation px is a:

Chest strap

How well did you know this?

Not at all

Perfectly

Homer e-400 elbow unit allows the amputee to

Lock the elbow in 11 positions of flexion

How well did you know this?

Not at all

Perfectly

The amount of glenohumeral flexion required to fully flex the elbow of a TH px should not exceed:

45 degree

How well did you know this?

Not at all

Perfectly

Before fitting the class II, standard TH check socket, the rough proximal trim line should come:

Just over the acromium

How well did you know this?

Not at all

Perfectly

To operate the locking mechanism of the Homer e-400 internal locking elbow adult size requires:

1/2-5/8” cable excursion and 2-3lbs of force

How well did you know this?

Not at all

Perfectly

For class I TH amputee, the anterior and posterior trimline terminate where?

Just lateral to the deltopectoral groom and off the scapula

How well did you know this?

Not at all

Perfectly

For class II TH amputee, what is the biomechanical reasoning for the position of the anterior and posterior timeline

To limit internal and external rotation of the glenohumeral joint

How well did you know this?

Not at all

Perfectly

How does the prosthetist determine the humeral length of the prostheses for a bilateral TH amputee

Body height(in) x 0.19

How well did you know this?

Not at all

Perfectly

What effect does the spring lift assist have on the force required to raise the forearm?

Helps to reduce force needed to begin initial flexion from a fully extended position of the forearm

How well did you know this?

Not at all

Perfectly

For TH amputee what are the motions involved in operating the elbow lock?

GH extension, abduction and should depression

How well did you know this?

Not at all

Perfectly

TH amputee cant fully pen the TD at mouth. Name 3 possible solutions for this problem

Tighten harness
Adjust cross point placement
Adjust housing length (TD HITTING DISTAL HOUSING)
Correct position of EFA
Correct control attachment strap placement (control strap not over distal 1/3 of scapula)
Move base plate and retainer distal and posterior
Add cross back strap
Fix loose fitting socket
Fix sharp bends or kinks in cable

How well did you know this?

Not at all

Perfectly

TH TD is opening before reaching the mouth. Name two possible solutions for the problem:

Add more rubber bands to TD
Cable short
Fair leads split housing hitting on elbow flexion
More EFA more distal
Move base plate and retainer proximal and anterior
Lighter TD
Shorter forearm
Add elbow lift assist
Add second base plate and retainer to keep cable anterior to elbow joint

How well did you know this?

Not at all

Perfectly

forearm is reflexes order to

Reach mouth

How well did you know this?

Not at all

Perfectly

A mechanical partial hand px would be contraindicated for a transmetacarpal amputation with:

The thumb and index finger remaining

How well did you know this?

Not at all

Perfectly

The initial socket brim for a short AE amputation would be trimmed on a line

1 to 2 inches above the acromion

How well did you know this?

Not at all

Perfectly

For those amputee that incorporate a step-up hinge: IT requires more_____ to flex the forearm but you gain____

Force; range of motion

How many carpal bones are there in the human body

What does the nudge control enable the amputee do:

Lock and unlock the elbow by pressing a lever with the chin

What is the purpose of fig. 8 BE harness

To suspend the px and to operate the TD

What is greatly minimized for a shoulder disarticulation amputee

Sphere of work area activities

In performing the checkout of the TR px the following force measurements where made: 6lbs. Pull at TD, and 10lbs pull at the control attachment strap. The housing is lined with teflon. The control system efficiency for this cable is

60%- below standard

What is the major advantage of using the housing cross bar assembly?

Reduces control cable bending, increasing system efficiency

What normal functions can be mechanically reproduced in a px arm:

Joint stabilization

The major TR px control motion is glenohumeral:

Flexion

The muenster design TR px presents a dilemma in that it

Offers excellent suspension but limits ROM

What is considered the correct length for a BE px.? The curve of the hook shoulder correspond to the :

Sound side thumb tip

Major supinator of the forearm is the:

Biceps

Loss of the upper limb just distal to the supinator muscle will result in what amputation level:

Short BE RL

What would be lost if a Bowden control cable were to be used instead of a fair lead control cable on a THpx

Elbow flexion

Elbow flexion is obtained through the

Brachialis

Rigid joints would be indicated for a patient who:

Had 50% forearm length

What is the dual control cable system called?

Fair lead

When does the trimline in a trans-radial px extend over the humeral epicondyles

When there is inadequate pronation and supination that can be captured in the socket

The retainer is coated in the proximal 1/3 of the TR px becasue:

To allow rotation of the TD with out kinking the housing

In the TR px, the cross bar is located mid-humerus (or up 1”) in order to

Fully open the TD with minimal glenohumeral humeral flexion

When fabricating the TR control cable, the prosthetist measure the distal housing length with TD in:

Supination

To fit the triceps cuff, prosthetist must take circumferential measurements where?

1” proximal to the cubital fold and around deltoid insertion

The total normal range available in forearm rotation (sup and pro) is:

170 degrees

To allow maximum rotation in the long BE and wrist disarticulation the prosthetist must provide what shape?

Screwdriver

Self suspending transracial socket suspends in what manner?

M-L pressure, assisted by AP pressure

Medium length TR there can be some residual pronation becasue:

Pronation teres is till largely intact

The Northwestern supracondylar design for self suspending TR socket

Has trimline that sweeps distally on the anterior socket

TR less than 50% forearm remaining indicates for:

Rigidhinges

Oval wrist units preferred to round wrist unit

For WD px- permits the TD to pick up articles from a flat surface

Retainer on a Class 1 TH amputee is placed where?

50% of anatomical humerus

Retainer on a 50% length Cass II AE amputee is placed where?

1” proximal to the cut end of the bone

In the coronal plane, a plumb line dropped through the acromium of the class II AE socket should fall through what landmark in a person with normal weight?

The medial boarder of the turntable

What is a possible cause of external rotation of the AE px during humeral flexion

Humeral retainer too far lateral | Lateral suspension strap attached too far posterior

Hosiery E-400 elbow unit allows the amputee to

Lock elbow in any 11 positions b/w 15-135 degree flexion

In placing the outside locking elbow joint on an ED px the joint enter should be placed on the humeral epicondyles. T/f?

True

Complete absence of the upper limb distal to the shoulder joint is termed

Amelia

In normal movement, when the elbow is flexed to 90 the forearm can be rotated horizontally through an arc by activate internal and external humeral rotation. The size of the arc is?

110 degrees

When considering children with phocomelic upper limbs, the common transverse deficiency is_____, and the common longitudinal deficiency is____.

Humeral, radial

When a radial deficiency (partial or complete) is present, the hand typically presents with:

Radial deviation of the hand on the ulna

Becasue of the loss of glenohumeral rotation in bilateral class II trans humeral amputation, the surgeon may perform a procedure to enhance the amputee’s ability to actively position the px in space on one or both sides:

Angulation osteotomy

Approximately____incehs of excursion are required to operate a dual control system

4.5

When operating a voluntary opening TD close to the body, the TR or Th amputee uses _____as the source of excursion and force:

Scapular abduction

The syndrome resembling a lobster flow or bifurcation of the hand (sometimes into forearm) is called___

Ectrodactyly (central ray syndrome)