Page 1 of 47
ORTHOPEDIC NURSE CERTIFICATION (ONC)
EXAMINATION 2026 COMPLETE (120) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH DETAILED
RATIONALES.
(ONC)
Prepare confidently for the Orthopedic Nurse Certification Exam with this
comprehensive study resource. This PDF reviews essential orthopedic nursing
concepts, musculoskeletal disorders, patient assessment, treatment principles,
postoperative care, and other key topics commonly covered on the certification exam.
It is ideal for self-study, certification preparation, and final exam review. A valuable
resource for nurses seeking to strengthen their knowledge and improve their
readiness for orthopedic nursing certification.
MULTIPLE CHOICE.
SECTION A: DEGENERATIVE DISORDERS (Questions 1-25)
1. A patient diagnosed with osteoarthritis of the right knee is scheduled
for a total knee arthroplasty. Which pathophysiological finding is most
characteristic of this condition?
A) Systemic inflammation with elevated erythrocyte sedimentation rate (ESR)
B) Progressive loss of articular cartilage with subchondral bone remodeling
C) Autoimmune destruction of synovial joints
D) Urate crystal deposition in the joint space
Correct Answer: B
Rationale: Osteoarthritis is characterized by progressive loss of articular
cartilage, subchondral bone sclerosis, and osteophyte formation. It is a non-
inflammatory degenerative joint disease, unlike rheumatoid arthritis which is
systemic and autoimmune .
2. Which clinical finding is most consistent with osteoarthritis of the hip?
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A) Morning stiffness lasting greater than 60 minutes
B) Pain that worsens with activity and improves with rest
C) Symmetrical joint involvement
D) Presence of rheumatoid nodules
Correct Answer: B
Rationale: Osteoarthritis pain is typically mechanical—worsening with
activity and improving with rest. Morning stiffness in OA is usually brief (<30
minutes), unlike inflammatory arthritis .
3. A patient with a herniated lumbar disc at L4-L5 presents with pain
radiating down the posterior thigh and lateral leg. This pattern is
consistent with involvement of which nerve root?
A) L3
B) L4
C) L5
D) S1
Correct Answer: C
Rationale: L5 radiculopathy typically presents with pain radiating down the
posterior thigh and lateral leg. The L5 nerve root is most commonly affected at
the L4-L5 disc level, causing weakness in ankle dorsiflexion and extensor
hallucis longus .
4. What is the classic deformity associated with advanced osteoarthritis
of the knee?
A) Valgus deformity (genu valgum)
B) Varus deformity (genu varum)
C) Flexion contracture
D) Hyperextension
Correct Answer: B
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Rationale: Varus deformity (bow-legged) is the most common deformity in
knee osteoarthritis due to medial compartment cartilage loss. Valgus
deformity occurs less frequently with lateral compartment involvement .
5. Which of the following is a hallmark radiographic finding in
osteoarthritis?
A) Marginal erosions
B) Joint space narrowing and osteophytes
C) Periarticular osteopenia
D) Ankylosis
Correct Answer: B
Rationale: Joint space narrowing (due to cartilage loss) and osteophyte
formation are hallmark radiographic findings in OA. Erosions and osteopenia
are characteristic of inflammatory arthritis .
6. The primary treatment goal for a patient with cervical spondylosis is:
A) Surgical decompression in all cases
B) Pain relief and maintenance of function
C) Complete resolution of radiographic changes
D) High-dose corticosteroids
Correct Answer: B
Rationale: Cervical spondylosis management focuses on pain relief and
maintaining function through conservative measures including physical
therapy, NSAIDs, and activity modification. Surgery is reserved for cases with
progressive neurological deficits .
7. A patient presents with low back pain radiating to the buttock and
lateral thigh without neurological deficit. This presentation most likely
represents:
, Page 4 of 47
A) Cauda equina syndrome
B) Lumbar radiculopathy
C) Mechanical low back pain with referred pain
D) Spinal stenosis
Correct Answer: C
Rationale: Mechanical low back pain with referred pain (sciatica) presents
with pain radiating to the buttock and thigh without neurological deficit.
Radiculopathy would include motor or sensory changes; spinal stenosis
typically presents with neurogenic claudication .
8. A patient with severe osteoarthritis reports increasing pain and
difficulty performing activities of daily living. What is the most
appropriate nursing intervention?
A) Recommend complete bed rest
B) Administer narcotic analgesics only
C) Educate about joint protection and energy conservation techniques
D) Discourage all physical activity
Correct Answer: C
Rationale: Joint protection and energy conservation techniques help patients
maintain function and manage pain. Activity modification and low-impact
exercise are essential; complete rest is not recommended .
9. Which of the following is a risk factor for the development of
osteoarthritis?
A) Young age
B) Normal body weight
C) Female gender
D) Absence of joint trauma
Correct Answer: C
ORTHOPEDIC NURSE CERTIFICATION (ONC)
EXAMINATION 2026 COMPLETE (120) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH DETAILED
RATIONALES.
(ONC)
Prepare confidently for the Orthopedic Nurse Certification Exam with this
comprehensive study resource. This PDF reviews essential orthopedic nursing
concepts, musculoskeletal disorders, patient assessment, treatment principles,
postoperative care, and other key topics commonly covered on the certification exam.
It is ideal for self-study, certification preparation, and final exam review. A valuable
resource for nurses seeking to strengthen their knowledge and improve their
readiness for orthopedic nursing certification.
MULTIPLE CHOICE.
SECTION A: DEGENERATIVE DISORDERS (Questions 1-25)
1. A patient diagnosed with osteoarthritis of the right knee is scheduled
for a total knee arthroplasty. Which pathophysiological finding is most
characteristic of this condition?
A) Systemic inflammation with elevated erythrocyte sedimentation rate (ESR)
B) Progressive loss of articular cartilage with subchondral bone remodeling
C) Autoimmune destruction of synovial joints
D) Urate crystal deposition in the joint space
Correct Answer: B
Rationale: Osteoarthritis is characterized by progressive loss of articular
cartilage, subchondral bone sclerosis, and osteophyte formation. It is a non-
inflammatory degenerative joint disease, unlike rheumatoid arthritis which is
systemic and autoimmune .
2. Which clinical finding is most consistent with osteoarthritis of the hip?
, Page 2 of 47
A) Morning stiffness lasting greater than 60 minutes
B) Pain that worsens with activity and improves with rest
C) Symmetrical joint involvement
D) Presence of rheumatoid nodules
Correct Answer: B
Rationale: Osteoarthritis pain is typically mechanical—worsening with
activity and improving with rest. Morning stiffness in OA is usually brief (<30
minutes), unlike inflammatory arthritis .
3. A patient with a herniated lumbar disc at L4-L5 presents with pain
radiating down the posterior thigh and lateral leg. This pattern is
consistent with involvement of which nerve root?
A) L3
B) L4
C) L5
D) S1
Correct Answer: C
Rationale: L5 radiculopathy typically presents with pain radiating down the
posterior thigh and lateral leg. The L5 nerve root is most commonly affected at
the L4-L5 disc level, causing weakness in ankle dorsiflexion and extensor
hallucis longus .
4. What is the classic deformity associated with advanced osteoarthritis
of the knee?
A) Valgus deformity (genu valgum)
B) Varus deformity (genu varum)
C) Flexion contracture
D) Hyperextension
Correct Answer: B
, Page 3 of 47
Rationale: Varus deformity (bow-legged) is the most common deformity in
knee osteoarthritis due to medial compartment cartilage loss. Valgus
deformity occurs less frequently with lateral compartment involvement .
5. Which of the following is a hallmark radiographic finding in
osteoarthritis?
A) Marginal erosions
B) Joint space narrowing and osteophytes
C) Periarticular osteopenia
D) Ankylosis
Correct Answer: B
Rationale: Joint space narrowing (due to cartilage loss) and osteophyte
formation are hallmark radiographic findings in OA. Erosions and osteopenia
are characteristic of inflammatory arthritis .
6. The primary treatment goal for a patient with cervical spondylosis is:
A) Surgical decompression in all cases
B) Pain relief and maintenance of function
C) Complete resolution of radiographic changes
D) High-dose corticosteroids
Correct Answer: B
Rationale: Cervical spondylosis management focuses on pain relief and
maintaining function through conservative measures including physical
therapy, NSAIDs, and activity modification. Surgery is reserved for cases with
progressive neurological deficits .
7. A patient presents with low back pain radiating to the buttock and
lateral thigh without neurological deficit. This presentation most likely
represents:
, Page 4 of 47
A) Cauda equina syndrome
B) Lumbar radiculopathy
C) Mechanical low back pain with referred pain
D) Spinal stenosis
Correct Answer: C
Rationale: Mechanical low back pain with referred pain (sciatica) presents
with pain radiating to the buttock and thigh without neurological deficit.
Radiculopathy would include motor or sensory changes; spinal stenosis
typically presents with neurogenic claudication .
8. A patient with severe osteoarthritis reports increasing pain and
difficulty performing activities of daily living. What is the most
appropriate nursing intervention?
A) Recommend complete bed rest
B) Administer narcotic analgesics only
C) Educate about joint protection and energy conservation techniques
D) Discourage all physical activity
Correct Answer: C
Rationale: Joint protection and energy conservation techniques help patients
maintain function and manage pain. Activity modification and low-impact
exercise are essential; complete rest is not recommended .
9. Which of the following is a risk factor for the development of
osteoarthritis?
A) Young age
B) Normal body weight
C) Female gender
D) Absence of joint trauma
Correct Answer: C
