CTO Upper Extremity Orthotics 2

Question 1

After reduction of a posterior elbow dislocation, an orthosis typically restricts which motion to prevent re-dislocation?

Accepted Answer

Terminal extension

Answer

Full flexion beyond 90 degrees

Answer

Forearm pronation and supination

Answer

Wrist flexion and extension

Question 2

For a patient with radial nerve palsy, a dynamic wrist orthosis typically supports the wrist in approximately how many degrees of extension?

Accepted Answer

30–45 degrees

Answer

0–10 degrees

Answer

15–20 degrees

Answer

60–75 degrees

Question 3

A 'lumbrical bar' component added to an orthosis addresses which deformity?

Accepted Answer

Intrinsic minus (claw hand) deformity

Answer

Swan neck deformity

Answer

Boutonnière deformity

Answer

Mallet finger deformity

Question 4

To maximize mechanical efficiency in a dynamic finger extension orthosis, the outrigger should be positioned so the line of pull is at what angle relative to the middle segment of the finger?

Accepted Answer

90 degrees

Answer

45 degrees

Answer

60 degrees

Answer

Parallel to the long axis

Question 5

A static progressive orthosis differs from a dynamic orthosis primarily because it:

Accepted Answer

Uses inelastic components that are manually adjusted at treatment intervals

Answer

Uses rubber bands instead of springs

Answer

Is only used for acute traumatic injuries

Answer

Cannot generate enough force to address joint contractures

Question 6

Which orthosis design is most appropriate for a patient with median nerve injury at the wrist presenting with thenar muscle weakness?

Accepted Answer

Opponens orthosis

Answer

Wrist cock-up orthosis

Answer

Full resting hand orthosis

Answer

Dynamic MCP flexion orthosis

Question 7

Compared to a volar wrist orthosis, a dorsal wrist orthosis design primarily benefits patients by:

Accepted Answer

Leaving the palm free for sensory tasks and object manipulation

Answer

Providing greater wrist extension force

Answer

Reducing overall device weight significantly

Answer

Offering superior cosmetic appearance