OCC Casting Materials & Techniques 5

Question 1

Which complication is MOST associated with the use of fiberglass casting material compared to plaster?

Accepted Answer

Greater skin laceration risk during cast removal

Answer

Fiberglass is harder and more rigid than plaster, making the oscillating cast saw more likely to lacerate skin if the saw is not used correctly during removal.

Question 2

What does the term 'cast index' refer to in orthopedic casting?

Accepted Answer

A measurement used to assess cast molding adequacy for forearm fractures

Answer

The cast index is the sagittal cast width divided by coronal cast width on X-ray; a value ≤0.70 indicates adequate three-point molding for forearm fractures.

Question 3

When caring for a fresh plaster cast, which instruction is MOST important to give the patient?

Accepted Answer

Keep the cast dry and elevate the extremity

Answer

Keeping the cast dry prevents plaster breakdown and skin maceration, while elevation reduces swelling and associated neurovascular complications.

Question 4

A 'three-point pressure system' in cast molding refers to which concept?

Accepted Answer

Using counter-pressure at three points to hold a fracture in reduction

Answer

Three-point molding applies a corrective force at the fracture apex balanced by opposing forces proximal and distal, maintaining fracture reduction within the cast.

Question 5

Which of the following signs indicates that a patient's cast may be too tight and requires immediate evaluation?

Accepted Answer

Increased pain, numbness, or inability to move distal digits

Answer

Increasing pain, numbness, or loss of motor function distal to the cast are warning signs of vascular compromise or compartment syndrome requiring emergent evaluation.

(OCC) Orthopedic Casting Certification Practice Test

(OCC) Orthopedic Casting Certification Practice Test

OCC Casting Materials & Techniques 5