What condition does transient synovitis usually follow?

Transient synovitis, commonly observed in children, typically follows a viral infection or mild trauma. This condition is characterized by hip pain and limping due to inflammation of the synovial membrane in the hip joint, and it often occurs after a preceding viral illness, such as an upper respiratory infection or a mild viral gastroenteritis. The inflammation is believed to result from an immune response triggered by the viral infection, leading to increased fluid accumulation and pressure in the joint.

In contrast, other options like severe trauma or high fever are less commonly associated with transient synovitis. Severe trauma usually leads to different conditions, such as fractures or acute injury to the joint, while high fever is more associated with systemic infections or other serious conditions that may not directly cause transient synovitis. Gastroenteritis, while it can cause discomfort and may be part of a viral illness, is not a direct precursor like upper respiratory infections tend to be. Thus, viral infections and mild trauma are the most recognized triggers for transient synovitis, making this distinction important for diagnosis and management.