Orthopaedic Technologist Certified (OTC) Examination — Questions and Answers

Question 1: What is the medico-legal significance of thorough post-cast neurovascular documentation?

It provides evidence that complications were identified or excluded at the time of casting (Correct answer)
It is required only for surgical procedures, not casting
It speeds up insurance reimbursement
It allows the technician to discharge the patient independently

Correct answer: It provides evidence that complications were identified or excluded at the time of casting

Post-cast CSM documentation demonstrates that the technician checked for complications; absence of documentation creates liability if complications arise later.

Question 2: The radial nerve is most vulnerable to injury at which anatomical location during humeral shaft fractures or improper cast padding?

Lateral epicondyle
Spiral groove of the humerus (Correct answer)
Radial head
Cubital tunnel

Correct answer: Spiral groove of the humerus

The radial nerve passes through the spiral (radial) groove of the posterior humerus, making it susceptible to injury in mid-shaft humeral fractures.

Question 3: When padding a bony prominence (e.g., the fibular head) before casting, what is the standard approach?

Apply extra layers of cast padding over the prominence (Correct answer)
Use petroleum jelly over the prominence instead of padding
Remove all padding from the area and apply cast directly
Avoid padding prominences to ensure firm contact

Correct answer: Apply extra layers of cast padding over the prominence

Extra layers of cast padding over bony prominences reduce direct pressure and the risk of pressure ulcers and nerve injuries beneath the cast.

Question 4: A patient with a forearm cast develops skin maceration and a rash following exposure to water. The best management is:

Allow the cast to air-dry and apply talcum powder at the proximal edge
Reinforce the cast with fiberglass tape to limit future moisture entry
Apply antifungal powder through the cast opening
Remove the cast, treat the skin, and reapply with waterproof liner if appropriate (Correct answer)

Correct answer: Remove the cast, treat the skin, and reapply with waterproof liner if appropriate

Wet skin under a cast leads to maceration and fungal infection requiring cast removal, skin treatment, and reassessment of cast material choice.

Question 5: What instruction should the patient receive about positioning the casted extremity immediately after application?

Apply ice directly on top of the cast
Keep the extremity in a dependent position
Avoid any movement for 48 hours
Elevate above the level of the heart (Correct answer)

Correct answer: Elevate above the level of the heart

Elevation reduces post-casting swelling and decreases the risk of cast tightness and neurovascular compromise.

Question 6: Which fracture pattern describes a bone that bends but does not completely break, seen primarily in children?

Stress fracture
Spiral fracture
Comminuted fracture
Greenstick fracture (Correct answer)

Correct answer: Greenstick fracture

Greenstick fractures occur in pediatric patients whose immature, flexible bone bends and fractures on one cortex while the other remains intact.

Question 7: Testing motor function of the ulnar nerve is best accomplished by asking the patient to:

Flex the elbow against resistance
Abduct the fingers (spread them apart) (Correct answer)
Extend the wrist against resistance
Oppose the thumb to the index finger

Correct answer: Abduct the fingers (spread them apart)

Finger abduction is performed by the dorsal interossei, which are innervated by the ulnar nerve, making this the primary motor test for ulnar integrity.

Question 8: When caring for a patient with dementia in a cast, which instruction to caregivers is MOST critical?

Lock all cutting instruments to prevent cast removal
Monitor for signs of cast removal attempts and skin breakdown daily (Correct answer)
Sedate the patient if they attempt to touch the cast
Apply additional restraints to prevent the patient from moving

Correct answer: Monitor for signs of cast removal attempts and skin breakdown daily

Dementia patients may attempt cast removal and cannot communicate discomfort reliably; daily visual inspection and behavioral monitoring are essential.

Question 9: Which instrument is the standard tool for cast removal?

Bandage scissors
Oscillating cast saw (Correct answer)
Electric drill
Plaster knife

Correct answer: Oscillating cast saw

The oscillating cast saw vibrates rather than rotates, cutting hard cast material while minimizing risk of skin laceration.

Question 10: Why is extra padding used when casting pediatric patients compared to adults?

Pediatric skin is thicker and requires more compression
Children have more prominent bony areas and less subcutaneous tissue (Correct answer)
Children require thicker casts for activity restriction
Children move less, so padding prevents cast loosening

Correct answer: Children have more prominent bony areas and less subcutaneous tissue

Bony prominences in children have less protective fat and are at greater risk for pressure injury, requiring additional padding.

Question 11: Why is it important to use gloves when handling casting material?

To improve grip strength
To avoid staining the cast
To shape the cast faster
To prevent skin irritation and burns (Correct answer)

Correct answer: To prevent skin irritation and burns

It is crucial to use gloves when handling casting material because both plaster and fiberglass resins undergo an exothermic reaction (heat-generating) during the setting process. Direct contact with these materials can cause skin irritation or thermal burns. Gloves provide a protective barrier, safeguarding the technician's skin from chemical exposure and heat.

Question 12: Which condition is a CONTRAINDICATION to circumferential casting immediately after acute injury?

Buckle fracture in a pediatric patient
Chronic stress fracture of the metatarsal
Significant anticipated swelling (acute compartment risk) (Correct answer)
Stable mid-shaft radius fracture

Correct answer: Significant anticipated swelling (acute compartment risk)

Circumferential casts applied when significant swelling is expected can compress neurovascular structures, causing compartment syndrome.

Question 13: During cast removal with an oscillating saw, the technician should move the saw in a:

Rapid plunging motion to minimize heat generation
Circular motion to cut through in a single pass
Firm side-to-side rocking motion perpendicular to the skin, advancing incrementally (Correct answer)
Continuous longitudinal sliding motion from proximal to distal

Correct answer: Firm side-to-side rocking motion perpendicular to the skin, advancing incrementally

The oscillating cast saw should be used with a controlled up-and-down rocking motion—pushing through the cast then lifting—to cut the cast without cutting skin.

Question 14: After applying a fiberglass cast, the technician notices a focal hard ridge running lengthwise along the inner surface. The correct action is:

Pad over the ridge externally with elastic bandage
Remove and reapply the cast to eliminate the ridge before it causes a pressure ulcer (Correct answer)
Leave it; fiberglass ridges are normal and resolve as the cast cures
Apply heat to soften and smooth the ridge

Correct answer: Remove and reapply the cast to eliminate the ridge before it causes a pressure ulcer

An internal ridge creates a pressure point that will cause skin breakdown; the cast must be removed and reapplied correctly.

Question 15: Which of the following is a critical first step in cast application?

Applying padding over bony prominences (Correct answer)
Choosing cast color
Mixing the casting material
Shaping the cast edges

Correct answer: Applying padding over bony prominences

A critical first step in cast application is to apply adequate padding, especially over bony prominences. This padding protects the patient's skin and underlying tissues from pressure sores, skin breakdown, and nerve compression that can result from the rigid casting material. Proper padding ensures patient comfort and prevents complications throughout the immobilization period.

Question 16: What is the purpose of bivalving a cast?

To apply a new synthetic cast over the existing one
To reinforce the cast with additional layers
To remove the cast entirely
To split the cast into two halves to relieve pressure or allow for swelling (Correct answer)

Correct answer: To split the cast into two halves to relieve pressure or allow for swelling

Bivalving cuts both sides of the cast and releases the underlying padding, reducing circumferential pressure while maintaining some immobilization.

Question 17: When assessing the neurological status of a hand in a cast, a patient's inability to make an 'OK' sign (circle between thumb and index finger) suggests compromise of which nerve?

Ulnar nerve
Anterior interosseous nerve (branch of median) (Correct answer)
Radial nerve
Musculocutaneous nerve

Correct answer: Anterior interosseous nerve (branch of median)

The 'OK' sign tests the anterior interosseous nerve (a motor branch of the median nerve), which innervates the flexor pollicis longus and index finger flexor digitorum profundus.

Question 18: What is the recommended number of layers of stockinette that should extend beyond each end of a standard cast?

Stockinette is folded back 10–15 cm for maximum padding
No stockinette extension is used
2–5 cm of stockinette folded back over the cast edges (Correct answer)
1 layer folded back 1–2 cm

Correct answer: 2–5 cm of stockinette folded back over the cast edges

Approximately 2–5 cm of stockinette is folded back over the cast edges and incorporated to create a smooth, padded border that prevents skin irritation.

Question 19: A cast window is most appropriately cut in order to:

Allow the patient to perform range-of-motion exercises
Reduce the overall weight of the cast
Improve ventilation and reduce cast odor
Inspect a wound site or assess vascular access (Correct answer)

Correct answer: Inspect a wound site or assess vascular access

A cast window is cut to provide direct access to a specific area such as a wound for inspection, or to palpate a pulse when there is concern about vascular status.

Question 20: A fiberglass cast becomes warm during setting. This heat is primarily due to which process?

An exothermic polyurethane curing reaction (Correct answer)
Friction from wrapping the tape
Oxidation of the fiberglass fibers
Endothermic moisture absorption

Correct answer: An exothermic polyurethane curing reaction

Fiberglass tape contains a polyurethane prepolymer that undergoes an exothermic curing reaction when activated by water, generating heat.

Question 21: Which question is MOST important to ask a patient before cast application regarding allergies?

Allergy to latex or plaster (Correct answer)
Allergy to shellfish
Allergy to contrast dye
Allergy to penicillin

Correct answer: Allergy to latex or plaster

Latex allergy is critical because stockinettes and gloves may contain latex, and plaster allergy can cause skin reactions.

Question 22: When casting a child with an upper extremity fracture, the wrist is typically positioned in:

Neutral (0 degrees) for all pediatric wrist injuries
Full flexion to relax the flexor tendons
Full extension to maximize immobilization
Slight extension (10-15 degrees) for most forearm fractures (Correct answer)

Correct answer: Slight extension (10-15 degrees) for most forearm fractures

Slight wrist extension is the standard functional position for most pediatric forearm and wrist fractures unless otherwise specified by the clinician.

Question 23: Which standard precaution applies to all patient interactions?

Treat all body fluids as potentially infectious (Correct answer)
Use PPE only if infection is confirmed
Double glove for all procedures
Only isolate contagious patients

Correct answer: Treat all body fluids as potentially infectious

Standard precautions are a set of infection control practices where all human blood, body fluids, secretions, excretions (except sweat), non-intact skin, and mucous membranes are treated as potentially infectious. This universal approach applies to all patient interactions, regardless of their diagnosis, to prevent the transmission of infectious agents and protect both patients and healthcare workers.

Question 24: Which of the following best describes 'bivalving' a cast?

Adding a second layer of fiberglass over the primary cast
Removing the cast entirely with a saw
Splitting only the padding and stockinette without cutting the cast shell
Cutting the cast longitudinally on two sides to create two halves (Correct answer)

Correct answer: Cutting the cast longitudinally on two sides to create two halves

Bivalving involves making two longitudinal cuts on opposite sides of the cast, converting it into two clamshell-like halves to relieve pressure.

Question 25: A patient in a thumb spica cast complains that the thumb tip is numb and the nail bed does not refill within 2 seconds. The FIRST action is:

Reassure the patient and schedule follow-up in 48 hours
Immediately notify the supervising physician and prepare for cast modification or removal (Correct answer)
Elevate the extremity and reassess in 30 minutes
Apply ice over the cast to reduce swelling

Correct answer: Immediately notify the supervising physician and prepare for cast modification or removal

Numbness with delayed capillary refill indicates neurovascular compromise requiring urgent physician notification and potential cast alteration.

Question 26: Which fracture results from repetitive loading rather than acute trauma?

Comminuted fracture
Stress fracture (Correct answer)
Avulsion fracture
Pathologic fracture

Correct answer: Stress fracture

Stress fractures develop from cumulative microtrauma — such as repetitive impact in athletes — rather than a single traumatic event.

Question 27: Which assessment finding in a casted lower extremity requires IMMEDIATE notification of the supervising provider?

Warm and pink toes with brisk capillary refill
Absence of the dorsalis pedis pulse (Correct answer)
Slight itching sensation under the cast
Mild swelling of the toes

Correct answer: Absence of the dorsalis pedis pulse

Absence of a pedal pulse indicates potential vascular occlusion and is an emergency requiring immediate physician notification.

Question 28: A Colles fracture is a distal radius fracture with which characteristic displacement?

Volar displacement of the distal fragment
Transverse fracture with lateral displacement
Impaction without angulation
Dorsal displacement and angulation of the distal fragment (dinner fork deformity) (Correct answer)

Correct answer: Dorsal displacement and angulation of the distal fragment (dinner fork deformity)

The classic Colles fracture produces dorsal tilt of the distal fragment, creating the dinner fork silhouette on lateral X-ray.

Question 29: When converting a circumferential cast to a bivalved cast for home use, how are the two shells secured?

By stapling the edges of the shells
By applying a new thin layer of plaster over the cut lines
With an elastic (ACE) bandage wrapped over both halves (Correct answer)
By taping the shells together with duct tape

Correct answer: With an elastic (ACE) bandage wrapped over both halves

An elastic bandage holds bivalved cast shells in place while allowing removal for skin inspection and physical therapy.

Question 30: Which information is REQUIRED to be included on every cast application record?

Only the cast type and date
The patient's diagnosis and surgical history
Date, time, type of cast, materials used, neurovascular status, and technician name (Correct answer)
Patient's insurance information and billing codes only

Correct answer: Date, time, type of cast, materials used, neurovascular status, and technician name

A complete cast record includes procedure details, materials, neurovascular findings, and technician identification to ensure accountability and continuity of care.

Orthopaedic Technologist Certified (OTC) Examination

The OTC exam certifies orthopaedic technologists in patient assessment, casting and splinting techniques, surgical procedures, and clinic management. It is administered by the National Board for Certification of Orthopaedic Technologists (NBCOT).

Questions

35 min

Time Limit

70%

To Pass

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