Exam Practice Test Questions And

Certified Orthopedic Nurse Certification Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which bone is most commonly fractured in adults?
• Tibia
• Clavicle
• Femur
• Radius

Rationale: The clavicle is the most frequently fractured bone in adults due

to its subcutaneous position and exposure to direct trauma.

• What is the primary function of osteoclasts?
• Bone formation
• Bone resorption 1 / 4

• Collagen synthesis
• Calcium absorption

Rationale: Osteoclasts break down bone tissue during remodeling,

allowing calcium to be released into the bloodstream.

3. The most common site of hip fracture in older adults is:

• Greater trochanter
• Femoral neck
• Shaft of femur
• Lesser trochanter

Rationale: The femoral neck is a weak area prone to fractures due to

osteoporosis in elderly patients.

• Which test evaluates anterior cruciate ligament (ACL) stability?
• McMurray test
• Varus stress test
• Lachman test
• Drawer test for PCL

Rationale: The Lachman test is the most sensitive clinical test for ACL

integrity.

• / 4

• A patient with a fractured femur develops shortness of breath and

confusion. What complication should be suspected?

• Pulmonary embolism
• Compartment syndrome
• Fat embolism syndrome
• Pneumonia

Rationale: Fat embolism syndrome occurs when fat globules enter

circulation after long bone fractures, leading to respiratory distress and neurological symptoms.

6. The main purpose of Buck’s traction is to:

• Reduce muscle spasms
• Maintain fracture alignment
• Promote bone healing
• Relieve pain and reduce muscle spasms before surgery

Rationale: Buck’s traction is used short-term to relieve pain and muscle

spasms in hip and femur fractures prior to surgical fixation.

• What is the most common type of arthritis affecting weight-bearing

joints?

• Rheumatoid arthritis
• Gouty arthritis 3 / 4

• Osteoarthritis
• Septic arthritis

Rationale: Osteoarthritis is a degenerative joint disease that primarily

affects weight-bearing joints such as hips and knees.

• Which vitamin is essential for calcium absorption in bone health?
• Vitamin C
• Vitamin D
• Vitamin K
• Vitamin A

Rationale: Vitamin D facilitates calcium absorption from the intestines,

critical for bone mineralization.

• The nurse suspects compartment syndrome when a patient presents

with:

• Cool skin
• Pain out of proportion to injury
• Diminished reflexes
• Decreased heart rate

Rationale: Severe pain not relieved by analgesics is the earliest sign of

compartment syndrome due to increased pressure in muscle compartments.

• / 4