Diagnosis and Management of Transient Synovitis

Clinical Presentation and Diagnosis

The American College of Radiology suggests that preserved range of motion is a key distinguishing feature of transient synovitis, which typically presents with pain but maintains hip mobility, whereas other serious conditions cause significant movement restriction 1, 2, 3.
The typical course of transient synovitis is self-limited and usually resolves within 1-2 weeks, with a 7-day duration fitting this course 1, 2.
The absence of shortening effectively rules out significant hip dislocation or advanced slipped capital femoral epiphysis, which would cause limb length discrepancy 4, 5.
If there are any signs of infection, septic arthritis must be considered the diagnosis until proven otherwise, and typically causes severe pain with any movement and significant restriction of range of motion 1, 2, 3.
Hip ultrasound should be performed if radiographs are normal and symptoms persist, to detect joint effusion, which is present in both transient synovitis and septic arthritis 1, 2, 3.

Congenital limb length discrepancy, such as short femur, would be present from birth and is eliminated by the examination noting no shortening 4, 5.
Muscle tears cause localized tenderness and pain with specific movements, not generalized hip pain, and a 7-day duration without improvement would be unusual for a simple muscle strain in a child 3.
The clinical presentation of limping with hip pain in a child warrants investigation for hip joint pathology, not soft tissue injury 1, 2, 3.