OTC Orthopaedic Technologist Certified Orthopaedic Appliances and Bracing 4

Question 1

A patient with rheumatoid arthritis develops ulnar drift of the metacarpophalangeal joints. Which orthosis design best addresses this deformity?

Accepted Answer

Ulnar deviation orthosis with radially directed corrective straps

Answer

An ulnar deviation orthosis with radially directed corrective straps applies forces that counteract the characteristic ulnar drift at the MCP joints seen in rheumatoid arthritis.

Question 2

The CROW (Charcot Restraint Orthotic Walker) boot is primarily indicated for which patient population?

Accepted Answer

Charcot neuroarthropathy in diabetic patients

Answer

The CROW boot immobilizes and offloads the foot in patients with Charcot neuroarthropathy to prevent progressive bony collapse and ulceration.

Question 3

When applying a short arm cast, how far distally should the cast extend on the palmar surface to preserve metacarpophalangeal joint motion?

Accepted Answer

Distal palmar crease

Answer

Ending the cast at the distal palmar crease allows full MCP flexion while still adequately immobilizing the wrist and distal radius.

Question 4

Which principle explains why a three-point pressure system is effective in orthotic management of spinal deformities?

Accepted Answer

Two counter-forces oppose one primary corrective force to create moment correction

Answer

The three-point system applies one primary corrective force at the apex of the deformity while two counter-forces above and below create a corrective bending moment.

Question 5

A mallet finger injury resulting from disruption of the terminal extensor tendon is typically treated with which orthosis position?

Accepted Answer

DIP joint in full extension or slight hyperextension

Answer

A mallet finger splint holds the DIP joint in full extension or slight hyperextension continuously for 6-8 weeks to allow the extensor tendon to heal in continuity.

Orthopaedic Technologist Certified Test Practice Test

Orthopaedic Technologist Certified Test Practice Test

OTC Orthopaedic Technologist Certified Orthopaedic Appliances and Bracing 4