ONP-C study guide
ONP-C · Work through your exam, one topic at a time.
The Orthopaedic Nurse Practitioner-Certified (ONP-C) credential is a specialty certification for advanced practice registered nurses who assess, diagnose, and manage musculoskeletal conditions across the care continuum. It signals that a nurse practitioner has met a knowledge standard beyond entry-level APRN preparation in orthopaedics, and it is typically pursued by NPs working in orthopaedic clinics, fracture and trauma services, sports medicine practices, spine and joint replacement programs, and perioperative settings. The ONP-C study guide has 10 sections and about 2,635 words.
01Assessment, Diagnosis, and Diagnostic Imaging
This domain tests whether you can build a focused orthopaedic history, perform a reproducible physical exam, and choose the right imaging or laboratory test instead of ordering everything at once. History: onset (traumatic vs insidious), mechanism, pain location and radiation, night/rest pain, stiffness duration, functional loss, systemic symptoms (fever, weight loss, chills), prior injury/surgery, medications (steroids, anticoagulants, bisphosphonates).
324 words, about 2 min02Musculoskeletal Conditions and Disorders
This domain tests pattern recognition: distinguishing inflammatory from mechanical disease, applying classification criteria, and knowing when to refer. Osteoarthritis: activity-related pain, brief morning stiffness (<30 minutes), bony enlargement; radiographs show joint-space narrowing, osteophytes, subchondral sclerosis, and cysts.
266 words, about 1 min03Fracture Management and Traumatic Injuries
This domain tests systematic fracture description, initial stabilization, and recognition of limb-threatening complications. Describe every fracture: bone, location (proximal/mid/distal, intra-articular), pattern (transverse, oblique, spiral, comminuted, segmental), displacement, angulation, shortening, rotation, and open vs closed.
270 words, about 1 min04Pharmacologic Management and Pain Control
This domain tests multimodal analgesia, safe opioid prescribing, and prevention of medication harm in orthopaedic patients. Use multimodal analgesia: acetaminophen, NSAIDs when not contraindicated, regional blocks, and opioids only for breakthrough pain.
271 words, about 1 min05Surgical and Procedural Management
This domain tests perioperative risk assessment, sterile technique, and recognition of procedure-related complications. Preoperative assessment: cardiac risk, diabetes control (HbA1c), anticoagulation plan, anemia, nutrition, and smoking status.
244 words, about 1 min06Rehabilitation and Postoperative Care
This domain tests early mobilization, weight-bearing orders, precautions, and recognition of postoperative complications. Weight-bearing status must be explicit: non-weight-bearing, toe-touch, partial, or full.
258 words, about 1 min07Patient Education and Health Promotion
This domain tests whether you can translate a plan into behavior the patient can actually follow and document understanding. Use plain language, limit to three key points, and confirm with teach-back: ask the patient to explain or demonstrate the plan in their own words.
257 words, about 1 min08Professional Practice, Ethics, and Healthcare Systems
This domain tests scope of practice, consent, documentation, and ethical decision-making within orthopaedic care. Practice within state scope and institutional privileges; know when collaboration or referral is required.
244 words, about 1 min09Pediatric and Geriatric Orthopaedic Considerations
This domain tests age-specific anatomy, injury patterns, and safe prescribing at both ends of the lifespan. Pediatric bone: open growth plates, greater remodeling potential, and Salter-Harris classification (I-V).
249 words, about 1 min10Emergency and Acute Care Management
This domain tests rapid triage, limb salvage priorities, and recognition of time-critical orthopaedic emergencies. Primary survey first: airway, breathing, circulation, disability, exposure.
252 words, about 1 min