Hip

    Septic Arthritis of the Hip: Orthopaedic Emergency

    Joint infection — URGENT. Watch for fever + limping + refusal to bear weight in a child. Prompt evaluation.

    Medically reviewed: April 2026·Dott. Daniele Priano

    Quick Answers

    How to distinguish septic arthritis from transient synovitis?
    The two conditions can resemble each other (both cause sudden limping in the child), but some elements point toward septic arthritis: **significant fever**, rapid worsening, **total refusal to bear weight**, intense pain even at rest, significant blood test alterations. Transient synovitis, much more common, is a benign form that resolves spontaneously in a few days with rest. The distinction is made in urgent evaluation, including ultrasound and blood tests.
    Why is it so important to act quickly?
    Inside the joint, infection can **rapidly damage cartilage** and, in young children, can also compromise blood supply and growth of the femoral head. For this reason workup and possible drainage are organized without delay. Waiting 'to see if it passes' in the presence of fever + limping + significant pain is not a safe choice.
    See all 5 questions →
    Septic Arthritis of the Hip: Orthopaedic Emergency - Pediatric Orthopaedics Milan Dr. Priano

    ⚠️ Medical Emergency - Go to ER Immediately

    Septic arthritis requires immediate emergency care. Delays can cause permanent joint damage.

    Red Flags - Seek Immediate Care:

    • Fever + hip pain + limping or refusal to bear weight
    • Severe pain with stiffness and limited motion
    • Hip held in flexed and externally rotated position
    • Rapid worsening of general condition

    📞 Call 118 or go directly to the nearest Pediatric Emergency Department

    Septic arthritis of the hip is a joint infection that, especially in young children, represents a true orthopaedic emergency. Recognizing it and managing it quickly is essential to reduce the risk of permanent damage to the cartilage and to hip development. The typical picture combines fever, limping or refusal to bear weight, significant hip or groin pain, and a tendency for the child to hold the leg flexed and externally rotated in an antalgic position. The general condition can deteriorate rapidly. When these signs appear it is important to bring the child to urgent evaluation (pediatric emergency department): workup includes blood tests, hip ultrasound and, usually, joint fluid aspiration to confirm the diagnosis. Care always includes targeted antibiotic therapy and, in most cases, prompt surgical drainage of the joint.

    Assessment and treatment

    When to seek evaluation

    • Fever associated with limping or refusal to bear weight
    • Severe hip pain with marked limitation
    • Child holding the hip flexed and externally rotated
    • Swelling or redness in the groin area
    • Rapid worsening of general condition

    What is evaluated

    • Urgent blood tests
    • Hip ultrasound for joint effusion
    • Diagnostic joint fluid aspiration
    • Cultures of the joint fluid
    • MRI in selected cases to rule out osteomyelitis

    Treatment options

    • Blood cultures and, when feasible without unsafe delay, joint fluid sampling before antibiotics; in an unstable child, or if sampling would cause unsafe delay, immediate intravenous antibiotics
    • Arthrotomy with joint lavage, in selected cases
    • Arthroscopic drainage in selected cases
    • Joint aspiration/drainage in selected cases
    • Serial monitoring of recovery
    • Physiotherapy in the recovery phase, when indicated

    Frequently Asked Questions

    How to distinguish septic arthritis from transient synovitis?▼
    The two conditions can resemble each other (both cause sudden limping in the child), but some elements point toward septic arthritis: **significant fever**, rapid worsening, **total refusal to bear weight**, intense pain even at rest, significant blood test alterations. Transient synovitis, much more common, is a benign form that resolves spontaneously in a few days with rest. The distinction is made in urgent evaluation, including ultrasound and blood tests.
    Why is it so important to act quickly?▼
    Inside the joint, infection can **rapidly damage cartilage** and, in young children, can also compromise blood supply and growth of the femoral head. For this reason workup and possible drainage are organized without delay. Waiting 'to see if it passes' in the presence of fever + limping + significant pain is not a safe choice.
    What happens after drainage?▼
    After possible surgical drainage, **antibiotic therapy** is continued, initially intravenously during hospitalization and subsequently orally at home for a period to be agreed with the team. Hip mobilization is started early to recover range of motion. Close clinical and blood test follow-up is planned, then more prolonged follow-up to monitor hip development.
    What are the possible long-term consequences?▼
    When diagnosis and treatment are **timely**, the vast majority of children recover well and maintain a functionally normal hip. In cases diagnosed or treated late, cartilage or hip development changes may remain, with possible long-term repercussions. For this reason long-term follow-up is offered, until growth is complete.
    When should I take my child to the emergency room?▼
    Indications for urgent evaluation are: **fever associated with limping or refusal to bear weight**, intense hip or groin pain not relieved by rest, child holding the leg flexed and externally rotated, rapid worsening of general condition, swelling or redness in the groin. In these cases it is appropriate to go to the pediatric emergency department **without waiting**.

    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.

    We use necessary technical cookies and, only with your consent, aggregated statistics.

    Details

    With consent we enable Google Analytics 4, Google Ads conversion measurement (anonymized IP, no profiling or remarketing) and Microsoft Clarity, which analyses site usage with heatmaps and session recordings: sensitive content (form fields and the chat window) is masked and the data is not used for profiling or remarketing. The MioDottore (Docplanner) booking service loads only when you click the booking button.

    Privacy Policy