What is a common differential diagnosis for children presenting with a limp?

Transient synovitis is a common differential diagnosis for children presenting with a limp because it is a relatively frequent cause of hip pain in pediatric patients. This condition typically arises following a viral infection and is characterized by inflammation of the synovial membrane in the hip joint. Children often present with a sudden onset of hip pain, limited range of motion, and a limp, particularly after a preceding illness.

The age group most affected is between 3 and 8 years old, and boys are more commonly affected than girls. The diagnosis is supported by clinical evaluation and imaging studies, often revealing joint effusion on ultrasound while blood tests usually show normal inflammatory markers, which helps distinguish it from more severe conditions.

This condition is usually self-limiting, and management often consists of pain control and activity modification rather than surgical intervention, setting it apart from conditions like septic arthritis or osteosarcoma that typically require more immediate medical attention.

Overall, transient synovitis is a key consideration when evaluating a limping child due to its prevalence, benign nature, and the typical presentation that aligns well with the symptoms observed in young children.