Nursing care
Legg-Calve-Perthes Disease nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Legg-Calve-Perthes disease is idiopathic avascular necrosis of the femoral head in children aged four to eight, usually boys. Nursing care centres on protecting the femoral head from deformity: enforcing non-weight-bearing status, managing pain, and supporting a child through months of bracing or casting while the bone revascularises and remodels.
The clinical picture
A school-age boy, most often between four and eight years old, comes in with a limp that has been building for weeks. There is no fall, no fever, no swelling to point to. The parent will often say he has been favouring one leg on and off, and it looks worse after activity and better with rest. Hip, groin, thigh or knee pain may be present, or the child may report almost nothing beyond the limp itself.
The cause is disrupted blood supply to the femoral head's epiphysis. Without adequate perfusion the bone undergoes avascular necrosis, softens, and is at risk of collapsing under normal weight-bearing forces before it can revascularise and remodel. Boys are affected roughly four to five times more often than girls, though when girls do develop it, outcomes tend to be worse. Bilateral involvement occurs in a minority of cases, usually with one hip affected before the other.
Assessment: what to look for and in what order
Start with gait. Watch the child walk if he can tolerate it, and note an antalgic or Trendelenburg pattern. Then assess hip range of motion: internal rotation and abduction are typically the first and most limited movements, often before pain becomes obvious. Compare both hips side by side.
Ask about pain location and pattern, since referred knee pain is common and can mislead an unfocused assessment toward the wrong joint. Check leg length, looking for shortening on the affected side as the femoral head flattens. Review imaging findings as they come back: plain films may be normal early on, and an MRI or bone scan is often needed to catch the disease before radiographic changes appear. Document baseline mobility and pain scores so later interventions have something to measure against.
Immediate interventions
The priority intervention is containment: keeping the femoral head seated in the acetabulum so it retains a round shape while it heals. That means enforcing non-weight-bearing status immediately, whether through crutches, a wheelchair, an abduction brace, or a Petrie cast, depending on the stage and severity. This is not a short-term restriction; it typically runs for months, sometimes over a year.
Manage pain with age-appropriate analgesia and rest, and apply activity restriction consistently rather than only when the child reports pain, since a child who feels fine will otherwise resume running and jumping. If surgery is planned, such as a femoral or pelvic osteotomy for severe cases, prepare the child and family for the procedure and for the postoperative non-weight-bearing period that follows it.
Ongoing nursing management
Reinforce adherence to weight-bearing restrictions at every visit. This is the single hardest part of care for a young, otherwise well child who does not feel sick. Assess skin integrity under braces or casts regularly, checking pressure points and circulation, since a child in an abduction device for months is at real risk of skin breakdown.
Watch for the psychosocial toll of prolonged immobility: missed school, isolation from peers, and frustration at being unable to play. Coordinate with physical therapy once the child moves into a mobilising phase, and track range-of-motion and pain trends across visits rather than in isolation, since Perthes disease is managed over a long healing arc, not a single admission.
Patient and family education
Explain the disease in terms the family can act on: the femoral head has lost its blood supply, it is temporarily soft, and it needs to be protected from weight so it regrows round rather than flattened. Framing it this way makes the non-weight-bearing requirement make sense rather than feel arbitrary.
Teach brace or cast care, including skin checks and what redness or breakdown looks like. Give concrete guidance on adapted activities: swimming and stationary cycling are often permitted since they don't load the hip the way standing and running do, and offering this substitute helps prevent secretive noncompliance. Set expectations about timeline, since healing is measured in months to years, and prepare the family for follow-up imaging at intervals to track bone remodelling.
How this appears on the NCLEX
Expect a scenario describing a limping child aged four to eight with hip, groin or knee pain and no history of trauma, asking you to identify the priority nursing diagnosis or intervention. The correct answer usually centres on protecting the joint: enforcing non-weight-bearing status or teaching the family why restriction matters, rather than treating it as a simple pain-management case.
Questions may also test your ability to distinguish Perthes disease from other pediatric hip conditions such as slipped capital femoral epiphysis or transient synovitis, so know the distinguishing features: age group, absence of trauma or obesity as a risk factor, and the insidious limp. A question testing safe use of a brace or cast, or prioritising skin assessment in an immobilised child, is also fair game.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our pediatrics practice questions are the closest set to what this page covers.
Common questions
Why can't a child with Legg-Calve-Perthes disease bear weight?
The femoral head has lost blood supply and softened, so weight-bearing forces can flatten or deform it before it revascularises and remodels. Keeping the head fully seated and unloaded in the acetabulum, a principle called containment, protects its shape while healing occurs.
How long does non-weight-bearing status typically last?
It varies with severity and stage but commonly runs from several months to over a year. Families should be prepared for a long course with staged follow-up imaging rather than a quick resolution.
Is Legg-Calve-Perthes disease caused by an injury?
No. It's idiopathic avascular necrosis of the femoral epiphysis, and there is typically no history of trauma. A limp with no injury story in a young school-age child is part of what should raise suspicion.
What activities are safe during treatment?
Non-weight-bearing activities such as swimming and stationary cycling are usually encouraged, since they maintain fitness and joint motion without loading the hip. Running, jumping and contact sports are restricted until the physician clears weight-bearing.