ONC® Certification key terms

A structured check of circulation, sensation, and motor function in a limb, usually comparing it with the unaffected side. Nurses document color, temperature, capillary refill, pulses, swelling, pain, and movement to detect early compromise.

A limb-threatening emergency in which rising pressure inside a closed fascial space impairs blood flow and nerve function. Warning signs include pain out of proportion to injury, pain on passive stretch, tightness, paresthesia, and pallor.

A surgical incision through fascia to release pressure from a compartment. The wound is often left open and managed with dressings, negative-pressure therapy, or later skin grafting once swelling resolves.

The time for color to return after briefly pressing and releasing a nail bed or fingertip. Normal is roughly two seconds or less; delayed refill suggests poor perfusion but is unreliable in cold or edematous limbs.

A difference between the apical heart rate and the radial pulse counted simultaneously. In orthopaedic settings it may reflect dysrhythmia or poor peripheral perfusion rather than a primary musculoskeletal problem.

A complication, usually after long-bone or pelvic fracture, in which fat droplets enter the circulation. The classic triad is hypoxemia, neurologic changes, and a petechial rash, often appearing 24 to 72 hours after injury.

Formation of a clot in a deep vein that may travel to the lungs. After major orthopaedic surgery, prevention includes early mobilization, mechanical compression, anticoagulants, and monitoring for unilateral leg swelling or dyspnea.

Blockage of a pulmonary artery by thrombus or other material. Sudden dyspnea, chest pain, tachycardia, and hypoxemia after orthopaedic surgery require urgent assessment and escalation.

Sleeves that inflate and deflate rhythmically around the legs to mimic walking and promote venous return. They are a mechanical option for clot prevention when anticoagulation is contraindicated or as an adjunct.

Infection of bone, often from contiguous spread, direct inoculation, or hematogenous seeding. Signs include localized pain, warmth, swelling, fever, and sometimes a draining sinus; treatment usually combines antibiotics with surgical debridement.

Infection within a joint space that rapidly destroys cartilage if untreated. The joint is painful, swollen, warm, and held still; fever may be absent, so aspiration and culture guide diagnosis and treatment.

Infection involving an implanted joint replacement, presenting acutely or chronically with pain, swelling, wound drainage, or loosening. Management may require antibiotics alone or staged revision with implant removal.

A fracture with a wound connecting bone to the external environment. It requires urgent irrigation and debridement, tetanus assessment, antibiotics, and stabilization because of high infection risk.

A frame of pins or wires inserted into bone and connected by bars outside the skin to hold fragments in position. Pin sites need regular inspection for drainage, redness, and loosening.

A pulling force applied to a limb, through skin or skeletal pins, to align fractures, relieve muscle spasm, or immobilize a joint. Nurses monitor weights, ropes, pulleys, alignment, and skin integrity.

A break in the femur, tibia, humerus, or another long bone. Risks include major blood loss, fat embolism, compartment syndrome, and impaired mobility, so monitoring and early stabilization matter.

A break near the proximal femur, common after low-energy falls in older adults. Care focuses on pain control, early surgery when appropriate, delirium prevention, and rapid return to mobility.

An acute, fluctuating disturbance of attention and awareness, often triggered by pain, infection, medication, or hospitalization. In orthopaedic patients it can be mistaken for dementia and is linked to poorer outcomes.

A program that identifies patients with fragility fractures and coordinates bone health assessment, osteoporosis treatment, and fall prevention to reduce future fractures.

Low bone mass and structural deterioration that increase fracture risk, often silent until a break occurs. Nursing care includes calcium and vitamin D education, weight-bearing activity, and fall prevention.

A fracture caused by a fall from standing height or less, or from minimal trauma, suggesting weakened bone. It signals the need for osteoporosis evaluation and treatment.

A degenerative joint disease with cartilage loss, pain, stiffness, and reduced function, often affecting knees and hips. Management emphasizes exercise, weight control, analgesia, and joint replacement when severe.

A chronic inflammatory autoimmune disease causing symmetric joint pain, swelling, and stiffness, often with systemic symptoms. Nurses support disease-modifying therapy adherence, exercise, and joint protection.

Replacement of the knee joint surfaces with prosthetic components. Postoperative priorities include pain control, wound care, clot prevention, early ambulation, and achieving flexion and extension goals.

Replacement of the hip joint with a prosthesis. Nursing care includes precautions against dislocation, positioning, safe transfers, and monitoring for leg-length change, swelling, or neurovascular compromise.

Movement limits after hip replacement, such as avoiding extreme flexion, crossing the legs, or turning the leg inward. They reduce the risk of prosthetic dislocation, especially with a posterior surgical approach.

Surgical removal of all or part of a limb. Care includes stump shaping and wrapping, pain and phantom sensation management, contracture prevention, and preparing the patient for prosthetics.

Pain felt in the part of a limb that has been removed. It is a real neurologic phenomenon managed with desensitization, mirror therapy, medications, and reassurance rather than dismissal.

Systematic evaluation of pain location, intensity, quality, timing, and effect on function, using a validated scale appropriate to the patient. Reassessment after intervention shows whether treatment worked.

Combining different analgesic classes and techniques to improve pain relief while reducing opioid doses and adverse effects. It is central to enhanced recovery after orthopaedic surgery.

Reduced bowel frequency or difficult passage caused by opioid analgesia. Prevention includes fluids, fiber, mobility, and a bowel regimen started proactively rather than only after symptoms appear.

A coordinated pathway using patient education, optimized nutrition, short fasting, multimodal analgesia, and early mobilization to speed recovery and shorten hospital stay after orthopaedic procedures.

Getting patients moving and out of bed as soon as it is safe after injury or surgery. It reduces complications such as clots, pneumonia, pressure injury, and functional decline.

Localized skin and tissue damage, usually over a bony prominence, from sustained pressure or shear. Orthopaedic patients in casts, traction, or limited positions need regular skin inspection and repositioning.

Monitoring and protecting a casted limb, including checking for tightness, skin irritation, drainage, odor, and neurovascular changes. Patients learn never to insert objects inside a cast.

A validated tool scoring sensory perception, moisture, activity, mobility, nutrition, and friction or shear to estimate pressure injury risk and guide prevention planning.

A set of interventions, such as risk screening, bed brakes, call-light access, footwear, lighting, and toileting assistance, that reduces falls and injury during hospitalization and after discharge.

A sealed dressing connected to suction that removes fluid and promotes granulation in open or surgical wounds. Nurses monitor seal, pressure settings, drainage, and surrounding skin.