Hip

Transient synovitis of the hip in children

Name: Transient Synovitis of the Hip in Children | Milan
Creator: Dott. Daniele Priano
Published: 2026-08-01

Temporary inflammation of the hip causing a sudden limp. A benign picture, but it must be distinguished from septic arthritis.

Medically reviewed: August 2026·Dott. Daniele Priano

Quick Answers

How is it distinguished from septic arthritis?

The distinction is clinical and should not be made at home. Significant fever, complete refusal to bear weight, intense pain even at rest, rapid worsening of the general condition and markedly abnormal blood tests point towards **septic arthritis**. In transient synovitis the child is overall well and can usually put the foot down. When fever is associated with limping, urgent assessment in a paediatric emergency department is indicated.

Why does the child sometimes point to the knee rather than the hip?

Hip pain can be **referred to the thigh or knee** because of the nerve supply of the joint. For this reason, in a limping child complaining of knee pain without local signs, the hip is always examined.

How long does it last?

In most cases symptoms improve within a few days and resolve spontaneously. There is no duration that applies to everyone: if limping persists beyond the initial period, it is advisable to return for assessment and reconsider the diagnosis.

See all 5 questions →

Transient synovitis of the hip is a temporary inflammation of the synovial lining of the joint. It is the most frequent cause of sudden limping without injury in preschool and school-age children, and it often appears in the days following an upper respiratory infection.

The typical picture is a child who limps or complains of pain in the hip, thigh or knee, with a good general condition, without high fever and usually still able to put the foot down while limiting hip movement.

It is a diagnosis of exclusion: before attributing symptoms to transient synovitis, more demanding conditions must be ruled out, in particular septic arthritis of the hip, but also Perthes disease, slipped capital femoral epiphysis in adolescents and fractures. Clinical assessment, with blood tests and hip ultrasound when needed, therefore remains the central step.

The course is usually self-limiting: symptoms improve over a few days with relative rest and the guidance agreed with the paediatrician or the specialist. If symptoms persist or worsen, if fever or complete refusal to bear weight appears, or if episodes recur, a clinical reassessment is indicated.

When to seek evaluation

Limp that appeared suddenly without an obvious injury
Pain in the hip, groin, thigh or knee
Reduced hip movement, especially in rotation
Symptoms that do not improve after a few days of relative rest
Episodes recurring after weeks or months

What is evaluated

Clinical examination of hip mobility and gait
Temperature measurement and assessment of the general condition
Blood tests (inflammatory markers) when the picture is unclear
Hip ultrasound to document any joint effusion
X-ray or further imaging when Perthes, slipped epiphysis or fracture is suspected

Treatment options

Relative rest with temporary reduction of impact activities
Pain relief guidance agreed with the treating paediatrician
Clinical observation over the following days
Reassessment if symptoms persist, worsen or recur
No surgical indication: transient synovitis is not operated on

Frequently Asked Questions

How is it distinguished from septic arthritis?▼

Why does the child sometimes point to the knee rather than the hip?▼

How long does it last?▼

Can it happen again?▼

Some children have more than one episode. Recurrence is not alarming in itself, but it makes a **reassessment** useful, also to rule out other hip conditions such as Perthes disease.

Are exercises or physiotherapy needed?▼

Usually not. Transient synovitis resolves with relative rest and a gradual return to activity as pain allows. Specific rehabilitation is considered only if assessment identifies another cause that requires it.

Important Notice: The information on this page is for educational and informational purposes only and does not constitute medical advice. Each clinical case is unique: the appropriate treatment is determined during the specialist consultation, based on a thorough clinical examination and, where necessary, diagnostic imaging. For any doubts or concerns, please consult a specialist.