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

Restricting terminal elbow extension prevents the humeral-ulnar joint from re-dislocating posteriorly while allowing functional range of motion.

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

Positioning the wrist in 30–45 degrees of extension optimizes tenodesis and power grip function in radial nerve palsy.

Question 3

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

Accepted Answer

Intrinsic minus (claw hand) deformity

Answer

A lumbrical bar blocks MCP joint hyperextension, counteracting the intrinsic minus claw hand deformity seen in ulnar or combined nerve injuries.

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

A 90-degree angle of pull to the proximal segment of the finger being mobilized generates maximum rotational force with minimal translational force.

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

Static progressive orthoses use non-elastic components (screws, straps, hinges) that are incrementally adjusted as tissue lengthens, delivering a sustained low-load stretch.

(CTO) Certified Orthotic Technician Practice Test

(CTO) Certified Orthotic Technician Practice Test

CTO Upper Extremity Orthotics 2