Coxitis Fugax – Transient Synovitis in Children
Coxitis fugax is a transient inflammatory condition of the hip joint that primarily affects children, causing sudden hip pain and difficulty walking.
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Coxitis fugax is a transient inflammatory condition of the hip joint that primarily affects children, causing sudden hip pain and difficulty walking.
What is Coxitis Fugax?
Coxitis fugax, commonly referred to as transient synovitis of the hip, is a self-limiting inflammation of the hip joint. The name derives from the Latin words coxitis (hip joint inflammation) and fugax (fleeting, transient), reflecting its temporary nature. It is the most common cause of acute hip pain in children and predominantly affects boys between the ages of 3 and 10.
Causes
The exact cause of coxitis fugax remains unclear. It is believed that an immune reaction following a viral infection – most commonly an upper respiratory tract infection – triggers inflammation in the hip joint. This leads to an accumulation of fluid (effusion) within the joint capsule, which creates pressure and causes pain.
- Recent viral infections (e.g., common cold, influenza)
- Bacterial infections as a less common trigger
- Possible allergic or immunological responses
- Trauma (rarely)
Symptoms
The condition typically has a sudden onset and is characterized by the following symptoms:
- Unilateral hip pain, often radiating to the groin or knee
- Limping or a protective posture when walking
- Restricted range of motion in the hip joint, especially internal rotation and abduction
- Mild to moderate fever (not always present)
- Refusal of the child to bear weight on the affected leg
High fever, significant swelling, or markedly elevated inflammatory markers are more suggestive of a different, more serious condition and require prompt medical evaluation.
Diagnosis
Diagnosis of coxitis fugax is typically established through a combination of clinical examination, imaging studies, and laboratory tests:
Imaging
- Hip ultrasound: The preferred method – reliably detects a joint effusion without radiation exposure.
- X-ray: Used to rule out other conditions such as Perthes disease or slipped capital femoral epiphysis.
- MRI: Reserved for uncertain diagnoses or suspicion of more serious pathology.
Laboratory Tests
- Blood count, CRP, and ESR: typically only mildly elevated or normal in coxitis fugax
- Significantly elevated inflammatory markers raise concern for septic arthritis
The most critical differential diagnosis is septic arthritis (bacterial joint infection), which can cause severe, irreversible joint damage if left untreated and requires immediate medical intervention.
Treatment
Since coxitis fugax is self-limiting, management is typically conservative and symptomatic:
- Rest and reduced weight-bearing: Protecting the hip joint for several days to weeks
- Pain relief: Anti-inflammatory medications such as ibuprofen or paracetamol
- Physiotherapy: Gentle mobilization once acute symptoms have resolved
- Regular follow-up examinations to monitor recovery
Symptoms typically resolve completely within 1 to 4 weeks. In rare cases, the condition may recur. A rare but important long-term complication is Perthes disease (avascular necrosis of the femoral head), which is why follow-up appointments are recommended.
References
- German Society for Orthopaedics and Orthopaedic Surgery (DGOOC): Clinical guideline on coxitis fugax in childhood, AWMF Register.
- Kocher MS et al. - Differentiating between septic arthritis and transient synovitis of the hip in children: an evidence-based clinical prediction algorithm. Journal of Bone and Joint Surgery, 1999.
- Caird MS et al. - Factors distinguishing septic arthritis from transient synovitis of the hip in children. Journal of Bone and Joint Surgery, 2006.
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