A child with fever and a limp, presenting with a flexed, abducted, and externally rotated hip, is likely suffering from what condition?

• A. Transient synovitis
• B. Septic arthritis
• C. Osteomyelitis
• D. Perthes disease

Answer: (B)

The clinical presentation described—a child with fever, a limp, and the hip positioned in flexion, abduction, and external rotation—suggests septic arthritis. This condition is characterized by inflammation of the joint due to an infectious process, which can lead to joint effusion and significant pain, often resulting in the altered hip positioning noted in the scenario.

In children, septic arthritis commonly occurs in the context of systemic signs of infection, such as fever, making the fever an important clue in this case. The position of the hip (flexed, abducted, and externally rotated) reflects the child’s attempt to minimize pain and discomfort associated with the inflamed joint. Moreover, septic arthritis often requires prompt diagnosis and intervention to prevent joint damage, which is why recognizing its symptoms is crucial for timely management.

Other conditions may present with similarities, but they would not typically encompass the entire clinical picture as definitively as septic arthritis. For instance, transient synovitis could present similarly but usually lacks fever. Osteomyelitis could also cause limping and fever but usually involves localized bone pain rather than joint-specific symptoms. Perthes disease typically occurs in a different age group and presents with more gradual symptoms rather than acute fever and joint positioning.