Casting Technique

Question 1

what are the types of casting techniques

Answer 1

neutral position cast
partial weightbearing cast
pronated cast
rectus cast
vacum cast
computer imaging

Question 2

Neutral Position Cast Factors

Answer 2

STJ in neutral position
MTJ maximally pronated
ankle joint to 90’ or 1st resistance, whichever comes first

Question 3

proper technique for a neutral position cast requires

Answer 3

that the STJ be in neutral position with the MTJ joint maximally pronated

Question 4

most partial or full weight bearing techniques do not allow for control of the

Answer 4

MTJ

Question 5

cast evaluations are based on 10 points, what are they

Answer 5

1. overall quality
2. cast markings
3. straight lateral border
4. 5th digit in line with the lateral column
5. 1/3-2/3 rule
6. plantar bisection passes through the 2nd MT
7. hallux parallel to the supporting surface
8. FF to RF relationship matches the FF to RF relationship of the foot
9. Appropriate thumb position
10. Good skin lines

Question 6

the lateral border should be straight in what planes

Answer 6

transverse and sagittal plantes

Question 7

what does a straight lateral border indicate

Answer 7

that the oblique MTJ joint axis is fully pronated

Question 8

a supinated oblique MTJ axis will causes

Answer 8

• the cast to be convex laterally

- the FF to be plantarflexed on the RF

Question 9

the 5th digit should be

Answer 9

neither dorsiflexed (very common) or plantarflexed (less common)

Question 10

what happens when the 5th ray is dorsiflexed

Answer 10

the 5th MT i relatively plantarflexed, causing apparent increase in FF varus by supinating the longitudinal MTJ axis

Question 11

when viewing the plantar surface of the cast, the heel should be

Answer 11

bisected

Question 12

if the plantar heel bisection is extended distally it should pass through what MT

Answer 12

2nd MT

Question 13

if the plantar heel bisection passes lateral to the 2nd MT, the MTJ was

Answer 13

supinated

Question 14

what is the 1/3-2/3 Rule?

Answer 14

• the lateral 1/3 of the longitudinal arch should be flat
• the middle 1/3 should be gradually sloping upward
• medial 1/3 should be rapidly sloping upward

Question 15

in the STJ is pronated, the flat lateral portion is likely to be

Answer 15

> 1/3

Question 16

if the STJ is supinated, the flat lateral portion is likely to be

Answer 16

< 1/3

Question 17

generally a dorsiflexed hallux indicates

Answer 17

a plantarflexed 1st ray (may be a good thing)

Question 18

a plantarflexed hallux indicates

Answer 18

a dorsiflexed 1st ray (almost never a good thing)

Question 19

the FF to RF relationship in the cast should match what

Answer 19

the FF to RF relationship in the foot

Question 20

an increased varus position of the FF in the cast compared to that of the foot indicates that the foot was casted with the MTJ

Answer 20

supinated

Question 21

decreased varus/increased valgus position in the cast compared to the foot indicates the STJ

Answer 21

was pronated

Question 22

what does the thumb position indicate?

Answer 22

where/how the foot was loaded

Question 23

no thumb print means what?

Answer 23

that the foot was not loaded

Question 24

a thumb position falling more medial than just the 4th and 5th ray may suggest what?

Answer 24

supinate the MTJ

Question 25

a thumb position too far distal may have caused the 5th digit to be

Answer 25

dorsiflexed

Question 26

what do good skin lines indicate

Answer 26

good contact of plaster to skin

Question 27

describe the plaster techniques used for casting

Answer 27

• two 5x30 plaster strips, each folded in half
• 1/2 inch to 1 inch fold on one side of the length of plaster
• back half goes around the heel. Front half goes around the forefoot. Foot is then positioned

Question 28

what is the most important thing to remember when using STS

Answer 28

• to put the plastic bag on the foot 1st
• put it on like a sock
• position the foot