Which are the symptoms of Legg-Calvé-Perthes disease?

TL;DR: Legg-Calvé-Perthes disease is characterized primarily by a painless or mildly painful limp, restricted hip movement, and groin or knee pain that worsens with physical activity. Symptoms typically progress through stages of bone death (necrosis), fragmentation, and eventual re-ossification of the femoral head in the hip joint.

What are the primary symptoms of Legg-Calvé-Perthes disease?

The clinical presentation of Legg-Calvé-Perthes disease often begins insidiously. The most common symptom reported by the 227 members of the DiseaseMaps community is a persistent limp, which is frequently painless in the early stages. As the disease progresses, children often experience:

• Intermittent hip or groin pain: This pain may radiate down to the knee or thigh, which can sometimes lead to a misdiagnosis.


• Reduced range of motion: Stiffness in the hip joint, particularly during internal rotation and abduction, is a hallmark of Legg-Calvé-Perthes disease.


• Muscle atrophy: Over time, the muscles in the affected thigh may appear smaller or weaker due to disuse and chronic inflammation.


• Shortening of the limb: In advanced cases, the structural changes to the femoral head can cause a slight discrepancy in leg length.

How do symptoms of Legg-Calvé-Perthes disease change over time?

Legg-Calvé-Perthes disease follows a predictable, albeit slow, progression. The condition typically evolves through four distinct phases: necrosis (loss of blood supply), fragmentation (bone breakdown), re-ossification (bone healing), and remodeling. During the fragmentation phase, symptoms are often at their peak, as the femoral head is structurally weakest. Parents may notice that their child’s ability to participate in sports or strenuous play decreases significantly during this time. While some children experience only mild discomfort, others may face severe pain that limits mobility, highlighting that the severity of Legg-Calvé-Perthes disease varies greatly based on the extent of femoral head involvement.

Which symptoms most impact daily quality of life?

For children living with Legg-Calvé-Perthes disease, the restriction of physical activity is often the most significant challenge. The need to limit high-impact sports to protect the hip joint can lead to feelings of isolation or frustration. Furthermore, the chronic nature of the hip pain—even when mild—can interfere with sleep and school attendance. Managing these daily limitations requires a multidisciplinary approach, including physical therapy to maintain joint mobility and psychological support to help the child navigate the long-term nature of treatment.

When should you seek immediate medical attention?

While Legg-Calvé-Perthes disease is generally a chronic condition, certain "red flag" symptoms necessitate urgent evaluation by a pediatric orthopedist. You should seek immediate care if your child experiences:

1. Sudden, severe pain that prevents weight-bearing on the affected leg.


2. The development of a fever, which could indicate an infection (septic arthritis) rather than Legg-Calvé-Perthes disease.


3. Inability to move the hip joint at all, which may suggest a locked joint or severe inflammation.


4. Rapid progression of symptoms that significantly deviates from the child's typical baseline.

Next steps

• Consult a pediatric orthopedist for a physical examination and imaging (X-rays or MRI) to confirm a diagnosis of Legg-Calvé-Perthes disease.


• Join the DiseaseMaps community to connect with other families who have navigated the diagnosis and management of Legg-Calvé-Perthes disease.


• Discuss physical therapy options with your medical team to maintain hip joint range of motion.


• Maintain a symptom diary to help your physician track the progression of the disease over time.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Legg-Calvé-Perthes disease profile.


• Orphanet: Rare disease database entry for Legg-Calvé-Perthes disease.


• American Academy of Orthopaedic Surgeons (AAOS): Clinical guidelines for pediatric hip disorders.


• OMIM (Online Mendelian Inheritance in Man): Clinical synopsis for Legg-Calvé-Perthes disease.