What is the recommended management for Legg‑Calvé‑Perthes disease in adults?

Management of Legg-Calvé-Perthes Disease in Adults

Adults with symptomatic Legg-Calvé-Perthes disease sequelae should be managed based on the specific deformity pattern and degree of osteoarthritis, with surgical hip dislocation for femoroacetabular impingement in pre-arthritic hips or total hip arthroplasty with modular components for established arthritis.

Understanding the Adult Presentation

Adults who had Perthes disease as children present with residual femoral head deformity that causes two distinct clinical problems:

• Pre-arthritic femoroacetabular impingement from non-spherical femoral head, short femoral neck with overriding greater trochanter, and secondary acetabular remodeling 1, 2
• Established osteoarthritis requiring joint replacement 3
• Adults with Perthes sequelae have significantly worse pain, physical function, and quality of life compared to age-matched controls across all HOOS and SF-36 scales, with females and obese patients experiencing worse outcomes 4

Diagnostic Workup

Clinical Assessment

• Document groin pain pattern, range of motion limitations (particularly internal rotation and flexion), and presence of mechanical symptoms 1, 2
• Assess for limping, leg length discrepancy, and trochanteric prominence 3
• Perform impingement testing to identify anterior femoroacetabular contact 2

Imaging Protocol

• Plain radiographs: AP pelvis and lateral hip views to assess femoral head sphericity, neck-shaft angle, acetabular coverage, and presence of osteoarthritis 5, 6
• Gadolinium-enhanced MR arthrography: Identifies labral tears and acetabular cartilage lesions in pre-arthritic hips with 90% sensitivity 1
• Advanced imaging: Perfusion MRI may refine surgical decision-making in the future 5

Treatment Algorithm

For Pre-Arthritic Hips with Femoroacetabular Impingement

Surgical hip dislocation is the treatment of choice for symptomatic young adults without established arthritis 6, 1, 2:

• Allows complete inspection of the hip joint and dynamic assessment of femoroacetabular contact during motion 2
• Enables reshaping of the femoral head to correct head-neck offset 1
• Permits treatment of acetabular rim pathology including labral tears and cartilage lesions 1, 2
• May be combined with proximal femoral osteotomy for severe deformity 1

Expected outcomes: At mean 33-month follow-up, 50% of patients are pain-free and all show improvement in pain compared to preoperatively, with 10 of 12 patients demonstrating improved range of motion 1

For Established Osteoarthritis

Total hip arthroplasty with modular femoral components is the definitive treatment 3:

• Non-cemented modular stems accommodate the metaphyseal-diaphyseal size mismatch present in 80% of cases 3
• Modular design allows correction of abnormal anteversion present in 71% of cases 3
• Improves trochanteric height, body weight lever arm, and leg length discrepancy (all p<0.05) 3

Expected outcomes: Harris hip scores improve from mean 49.8 to 93.9 (p<0.05) at mean 8.2-year follow-up, with 94% of patients demonstrating diminished or no limping and 100% achieving leg length equality 3

Non-Surgical Management

While not specifically addressed in high-quality evidence for adult Perthes sequelae, conservative management principles from osteoarthritis guidelines may apply to mild cases 7:

• Activity modification and exercise programs focusing on hip strengthening and aerobic fitness 7
• Weight loss if overweight or obese 7
• NSAIDs or acetaminophen for pain relief, using lowest effective dose 7
• Walking aids and assistive devices to reduce joint loading 7

Critical Pitfalls to Avoid

• Do not delay surgical referral in symptomatic young adults with pre-arthritic hips, as progressive cartilage damage from impingement is irreversible 1, 2
• Recognize that standard THA stems fail in Perthes anatomy—modular components are essential to accommodate the unique deformity 3
• Understand that pain relief alone is insufficient—the goal is preventing premature osteoarthritis in younger patients and restoring biomechanics in those requiring arthroplasty 5, 3
• Do not assume childhood treatment history predicts adult outcomes—adults who reported no childhood treatment actually had worse outcomes, but all adults with Perthes sequelae show significant disease burden regardless of childhood intervention 4

Referral Indications

Refer to an experienced hip preservation surgeon or adult reconstruction specialist for:

• Any symptomatic adult with Perthes sequelae and groin pain 6, 2
• Mechanical symptoms suggesting labral pathology or impingement 1, 2
• Progressive functional decline or activity limitation 4
• Radiographic evidence of femoral head deformity with or without osteoarthritis 5, 6