OTC Orthopaedic Technologist Certified Orthopaedic Appliances and Bracing 2 — Questions and Answers
Question 1: Which type of knee orthosis is specifically designed to unload one compartment of the knee joint in patients with unicompartmental osteoarthritis?
- Patellar tendon-bearing brace
- Unloader knee brace (Correct answer)
- Swedish knee cage
- Hinged neoprene sleeve
Correct answer: Unloader knee brace
An unloader knee brace applies a three-point pressure system to shift load away from the affected medial or lateral compartment of the knee.
Question 2: When fitting a TLSO (thoracolumbosacral orthosis), which anatomical landmark is used as the superior reference point for the sternal pad?
- Clavicle
- Sternal notch (Correct answer)
- Manubriosternal junction
- Xiphoid process
Correct answer: Sternal notch
The sternal notch (jugular notch) serves as the superior landmark for the sternal pad to ensure proper thoracic immobilization without impeding cervical motion.
Question 3: A patient presents with a drop foot condition. Which ankle-foot orthosis (AFO) configuration is most appropriate for providing toe clearance during the swing phase?
- Solid ankle AFO
- Floor-reaction AFO
- Posterior leaf spring AFO (Correct answer)
- Patellar tendon-bearing AFO
Correct answer: Posterior leaf spring AFO
A posterior leaf spring AFO provides dorsiflexion assistance during swing phase to clear the toes while allowing some push-off at terminal stance.
Question 4: Which casting material sets the fastest, making it most appropriate when rapid immobilization is clinically required?
- Extra-fast setting plaster of Paris (Correct answer)
- Fiberglass casting tape
- Thermoplastic splinting material
- Standard plaster of Paris
Correct answer: Extra-fast setting plaster of Paris
Extra-fast setting plaster of Paris reaches working rigidity in approximately 2-3 minutes, making it ideal when rapid immobilization is needed.
Question 5: The Milwaukee brace is a cervicothoracolumbosacral orthosis (CTLSO) primarily used to treat scoliosis curves with the apex at which vertebral level?
- L3 or below
- L1-L2
- T8 or above (Correct answer)
- T12-L1
Correct answer: T8 or above
The Milwaukee brace is indicated for high thoracic scoliosis with an apex at T8 or above, where the cervical superstructure provides necessary corrective forces.
Question 6: When applying a functional fracture brace (cast-brace) for a tibial shaft fracture, which mechanical principle allows controlled fracture healing while permitting weight bearing?
- Total contact casting
- Hydraulic muscle compression (Correct answer)
- Fracture stabilization via cortical contact
- Transcutaneous electrical stimulation
Correct answer: Hydraulic muscle compression
Hydraulic compression from surrounding soft tissues and muscles under the snug brace creates a rigid column effect that stabilizes the fracture during weight bearing.
Question 7: Which component of a thoracic extension orthosis (Jewett brace) provides the posterior counter-pressure needed to limit thoracic flexion?
- Anterior sternal pad
- Lateral uprights
- Posterior thoracic pad (Correct answer)
- Pelvic band
Correct answer: Posterior thoracic pad
The posterior thoracic pad in a Jewett brace creates a three-point pressure system with the anterior sternal and suprapubic pads to prevent thoracic flexion.
OTC Orthopaedic Technologist Certified Orthopaedic Appliances and Bracing 2
Which type of knee orthosis is specifically designed to unload one compartment of the knee joint in patients with unicompartmental osteoarthritis?