# Legg-Calvé-Perthes Disease

Legg-Calvé-Perthes disease requires early recognition of femoral-head ischemia, radiographic staging, and age- and severity-based containment decisions to preserve hip congruence. Management hinges on range of motion, lateral pillar involvement, extrusion, and timely pediatric orthopedic referral.

**Clinical question:** How should physicians diagnose, risk-stratify, and select containment treatment for Legg-Calvé-Perthes disease?

Updated: 2026-08-24T17:43:44.148647+00:00

## What matters in practice
- A child with activity-related limp and hip, groin, thigh, knee, or buttock pain warrants hip examination and radiographs; delayed diagnosis occurs in up to 20% of affected patients. [3][24]
- Age at onset, extent of femoral-head involvement, lateral extrusion, and maintenance of hip motion drive containment decisions and prognosis. [2][8][9][16][21]
- Children older than 8 years with lateral pillar B or B/C border disease had better outcomes with surgery than with nonoperative treatment in a comparative series. [10]
- Long-term prognosis is determined principally by hip congruence and residual femoral-head shape; Stulberg aspherical incongruence is associated with severe arthritis before age 50 years. [2]

## Identify Perthes disease and exclude urgent alternatives

Do not attribute a painless or knee-predominant limp to the knee until the hip is assessed.

Suspect Legg-Calvé-Perthes disease in a child—most often a boy aged 4 to 10 years—with a limp and activity-related hip or groin pain that may radiate to the thigh, knee, or buttock. Clinical hip restriction and gait change should trigger pelvic and hip imaging even when the presenting complaint is knee pain. [3][14]

The initial diagnostic branch is whether the child may have an alternative pediatric hip disorder requiring a different urgency and pathway. Slipped capital femoral epiphysis, septic arthritis, inflammatory hip disease, trauma, and malignancy remain competing diagnoses in a limping child; assess the entire lower limb and obtain inflammatory markers when infection or systemic inflammation is clinically plausible. ESR and CRP are among the laboratory tests used in evaluation of pediatric hip pathology. [14]

Obtain plain radiographs as the baseline study for diagnosis, staging, containment assessment, and serial comparison. Early radiographs can be unrevealing or difficult to classify; MRI can demonstrate early ischemic necrosis, and bone scintigraphic changes may precede radiographic classification changes. [14][18][21]
- Document hip range of motion at presentation and at each treatment decision; maintaining motion throughout treatment is considered essential to containment-based management. [9]
- Refer promptly to pediatric orthopedics after radiographic or MRI evidence of Perthes disease, because operative containment has its rationale in the early stage before substantial deformity occurs. [21]
- Assess the contralateral hip at baseline and during follow-up; bilateral sequential rather than simultaneous onset has been associated with poorer outcome. [2]

*Diagnostic information that changes the next step in suspected Perthes disease. [3][14][18][21]*

| Finding or test | Interpretation | Next action |
| --- | --- | --- |
| Activity-related limp with hip, groin, thigh, knee, or buttock pain | Compatible presentation for Perthes disease; referred knee pain can obscure the hip source. [3] | Perform focused hip examination and obtain baseline hip/pelvis radiographs. [3][14] |
| Concern for infection or inflammatory hip disease | Perthes is not the only cause of pediatric hip pain; ESR and CRP are relevant when the clinical presentation raises this possibility. [14] | Escalate evaluation for the competing diagnosis rather than treating presumed Perthes disease alone. [14] |
| Normal or nondiagnostic early radiographs with persistent clinical suspicion | Early radiographic classification may be difficult; MRI can show early femoral-head ischemic necrosis. [18][21] | Obtain MRI and involve pediatric orthopedics. [14][21] |
| Early bone scintigraphy showing revascularization/recanalization pattern | Scintigraphic changes can precede radiographic changes and correlate with later radiographic classifications. [18] | Use serial imaging with orthopedic interpretation when prognostic staging remains uncertain. [18] |

## Stage the hip to determine remodeling potential and containment need

Classify severity during the fragmentation phase and reassess as imaging evolves.

Perthes disease progresses through necrosis, subchondral fracture, fragmentation, revascularization/reossification, and healing/remodeling. The treatment objective during the vulnerable early phases is to keep the femoral head contained by the acetabulum while it repairs, thereby maximizing the chance of a spherical, congruent hip. [8][14]

Use age at clinical onset, extent of epiphyseal involvement, stage, lateral extrusion, hip motion, and femoral-head deformity together rather than relying on a single radiographic label. Older onset confers less remodeling potential and greater residual incongruity; children older than 8 years have poorer overall prognosis, although they may benefit from advanced operative treatment. [2][16][21]

The Herring lateral pillar system is a key severity classification, while Catterall-based assessments have historically been used to estimate femoral-head involvement. In early disease, these radiographic classifications can be difficult to apply; serial radiographs and, when needed, MRI or scintigraphy refine risk assessment before an irreversible treatment decision. [3][18]
- Treat lateral extrusion or loss of containment as a decision-changing poor prognostic feature, particularly when combined with severe head involvement. [9]
- Girls tend to have more severe femoral-head involvement than boys of the same age; do not downgrade risk solely because a patient is young. [2]
- Poor outcome can occur before age 6 years when the necrotic area is large; young age lowers risk but does not eliminate the need for imaging-based surveillance. [2]

### Use Stulberg class for long-term counseling

Stulberg classification describes the healed relationship between femoral-head sphericity and acetabular congruence. Congruence is a stronger predictor of later arthritis than femoral-head sphericity alone: spherical congruence carries no arthritis risk in the cited framework, whereas aspherical incongruence is associated with severe arthritis before age 50 years. [2]
- Counsel families that residual deformity, rather than early pain alone, drives adult hip risk; Perthes disease can produce painful, poorly functioning hips later in life. [2][21]

*Features that favor observation, intensified containment, or operative discussion. [2][9][10][16][21]*

| Risk pattern | Key discriminator | Management implication |
| --- | --- | --- |
| Lower-risk presentation | Younger onset, limited head involvement, minimal lateral extrusion, and preserved motion favor greater remodeling potential. [2][9][16] | Use activity modification, range-of-motion preservation, and serial clinical-radiographic follow-up with pediatric orthopedics. [9][14] |
| Intermediate-risk presentation | Approximately half or more of the head involved without excessive extrusion or other head-at-risk signs. [9] | Short-term abduction orthosis may be considered if range of motion can be maintained; reassess containment and extrusion serially. [9] |
| Higher-risk presentation | Older onset, severe head involvement, lateral extrusion, loss of containment, or restricted motion. [2][9][16][21] | Restore motion and discuss early operative containment when the hip is containable. [9][21] |
| Late residual deformity | Symptomatic incongruity after healing rather than active early-stage collapse. [4][23] | Evaluate for hip-preservation or salvage procedures; joint-preservation results are variable. [4][23] |

## Use nonoperative care to preserve motion and monitor containment

Nonoperative treatment is most defensible when the hip remains mobile and containment can be maintained.

Initial nonoperative management centers on preserving hip range of motion, reducing painful synovitis when present, modifying activity, and monitoring femoral-head containment. Reported nonsurgical options include physiotherapy, activity modification, traction or recumbency in selected circumstances, and hip-abduction orthoses. [5][9][12][14]

An abduction orthosis is intended to increase anterior and lateral acetabular coverage and keep the vulnerable epiphysis within the acetabulum. However, two major brace-treatment studies found no outcome advantage for bracing over observation or range-of-motion therapy, so bracing should not substitute for serial assessment of extrusion, motion, and radiographic progression. [10]

For less than half femoral-head involvement with minimal lateral extrusion, traction to regain motion and reduce synovitis has been described as sufficient initial treatment. For half or more involvement without excessive extrusion or other head-at-risk signs, a short course of abduction orthosis may be used; progression to excessive extrusion should prompt reconsideration of containment strategy. [9]
- Reassess pain, gait, abduction, and internal rotation at follow-up; declining motion compromises the practical ability to contain the head. [9]
- Do not assume a brace improves outcome in children aged 6 to 12 years with more advanced Catterall III or IV disease; comparative data found no difference among observation, bracing, and range-of-motion treatment groups. [10]
- Escalate to operative planning when severe involvement and excessive lateral extrusion persist despite efforts to restore motion and maintain containment. [9][21]

*Nonoperative options and their decision-limiting features. [9][10][12][14]*

| Strategy | Best-supported use in cited literature | Limitation requiring reassessment |
| --- | --- | --- |
| Range-of-motion therapy and activity modification | Core measures to preserve hip motion during disease evolution. [9][14] | Persistent or worsening restriction limits containment and should prompt orthopedic reassessment. [9] |
| Traction or recumbency | Described for synovitis reduction and recovery of motion when less than half the head is involved and extrusion is minimal. [9] | Does not address progressive extrusion or severe involvement. [9] |
| Abduction orthosis | May be used for short periods in selected hips with at least half-head involvement but no excessive extrusion or head-at-risk signs. [9] | Comparative studies did not show a clear benefit over observation or range-of-motion exercises. [10] |
| Observation alone | May be reasonable in younger children with limited collapse and favorable containment. [5] | Requires serial imaging because severity and containment can evolve through fragmentation and remodeling. [14][18] |

## Select operative containment for older or poorly contained hips

The operative goal is containment before major deformity becomes established.

Discuss operative containment early for a child with severe femoral-head involvement and excessive lateral extrusion, especially at older onset. Early-stage operative containment has been associated with improved femoral-head sphericity and better outcomes in multicenter prospective cohort studies, although treatment selection remains influenced by age, severity, disease stage, and preexisting deformity. [9][21]

Femoral varus osteotomy and pelvic/innominate osteotomy are established containment approaches for noncontainable hips. In children younger than 6 years, pelvic osteotomy has been associated with better radiographic outcomes than femoral osteotomy; from age 6 years onward, femoral and pelvic osteotomies were similarly likely to yield a spherical congruent head in the cited experience. [4][16]

In one comparative study, children older than 8 years with lateral pillar B and B/C border hips had significantly better outcomes with surgery than with nonoperative treatment. This is a useful referral-level discriminator rather than a standalone mandate: operative planning must also account for current containment, motion, stage, and head shape. [10][21]
- Restore and maintain hip motion before and after containment surgery; a stiff hip undermines the containment objective. [9]
- Use femoral or pelvic realignment when the head can be brought into a contained position; proximal femoral osteotomy is described as versatile for this purpose. [4]
- Avoid presenting osteotomy as a uniform solution: substantial methodological heterogeneity across studies leaves persistent controversy regarding relative superiority of operative and nonoperative methods. [11][21]

### Salvage after loss of congruence

When active containment is no longer feasible because of residual deformity or incongruity, salvage procedures aim either to improve acetabular coverage or redirect the femoral head toward a more congruent weight-bearing surface. Shelf acetabuloplasty and Chiari osteotomy are common acetabular salvage procedures; proximal femoral valgus osteotomy can improve congruence between misshapen surfaces. [4]
- Use caution with shelf acetabuloplasty in children older than 10 to 11 years; early-stage use has been associated with good or fair Stulberg outcomes, but age modifies selection. [4]
- For symptomatic healed deformity, surgical hip dislocation with femoral-head reshaping and relative femoral-neck lengthening preserved 60% of hips at median 10.2-year follow-up in one retrospective series, while 39% met a surgical-failure endpoint. [23]

*Operative options by treatment objective. [4][10][16][21][23]*

| Clinical objective | Procedure options | Selection considerations |
| --- | --- | --- |
| Early containment of a noncontainable hip | Femoral varus osteotomy or pelvic/innominate osteotomy. [16] | Favor early-stage intervention before major deformity; age, severity, stage, and range of motion guide choice. [21] |
| Containment in a child younger than 6 years | Pelvic or femoral osteotomy. [4] | Pelvic osteotomy had better radiographic outcomes than femoral osteotomy in the cited comparison. [4] |
| Containment in a child age 6 years or older | Femoral or pelvic osteotomy. [4] | Both approaches were similarly likely to yield a spherical congruent head in the cited series. [4] |
| Older child with lateral pillar B or B/C border disease | Operative containment discussion. [10] | Children older than 8 years had better outcomes with surgery than nonoperative treatment in a comparative study. [10] |
| Residual symptomatic incongruity | Shelf or Chiari osteotomy, femoral valgus osteotomy, or selected reconstructive hip-preservation procedures. [4][23] | Frame as salvage; outcomes vary and hip preservation is not assured. [23] |

## Monitor remodeling and counsel from residual congruence

Follow disease evolution until the hip has healed and residual shape can be assessed.

Serial follow-up should track symptoms, gait, hip range of motion, femoral-head contour, lateral extrusion, and containment on radiographs. The disease evolves through fragmentation, reossification, and healing, so a favorable early examination does not exclude later deformation during the vulnerable phases. [14][18]

Use age at onset and the geometric extent of femoral-head involvement for early counseling, but use healed congruence and head shape for long-term osteoarthritis risk assessment. Congruence is more predictive of future arthritis than sphericity alone, and Stulberg class provides a framework for estimating adult hip risk. [2]

Residual Perthes deformity can lead to painful, poorly functioning hips and secondary degenerative osteoarthritis in later life. In a recent review of diffusion-weighted imaging literature, the cited lifetime total hip arthroplasty rate among patients with Perthes disease was 39%, underscoring the importance of protecting hip morphology during childhood and reassessing symptomatic residual deformity in adolescence or adulthood. [6][21]
- Do not discharge solely because pain has improved; continued radiographic remodeling determines final femoral-head shape and congruence. [14][21]
- Reevaluate a healed hip that develops mechanical pain or functional decline for residual deformity and congruence-directed hip-preservation options. [4][23]
- Counsel families that greater age at onset, extensive necrosis, and residual incongruity carry a worse prognosis, while younger age does not fully offset severe involvement. [2][16]

*Prognostic variables for counseling and longitudinal surveillance. [2][6][16][21]*

| Variable | Prognostic meaning | Clinical use |
| --- | --- | --- |
| Age at onset | Older onset is associated with less remodeling potential and worse outcome; prognosis is poor overall after age 8 years. [2][16] | Lower threshold for containment-surgery discussion in an older child with substantial involvement. [10][21] |
| Femoral-head involvement and collapse | Greater involvement predicts worse outcome. [2][16] | Increase surveillance and assess for extrusion and surgical containment candidacy. [9][21] |
| Hip congruence | More predictive of future arthritis than femoral-head sphericity alone. [2] | Use residual congruence to counsel on adult degenerative risk. [2] |
| Stulberg aspherical incongruence | Associated with severe arthritis before age 50 years. [2] | Plan long-term symptomatic surveillance and reassess for joint-preservation or arthroplasty pathways when clinically indicated. [2][6][23] |

## References
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## Editorial note

Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.