- Etiology: idiopathic inflammatory process leading to fluid in hip joint
- Radiograph: widened hip joint space, not sensitive or specific for hip effusion, helpful in excluding other pathologies of hip pain
- US: hip effusion
- DDX: septic hip is indistinguishable from transient synovitis on US
- Clinical: most common cause of limp and acute pain in children < 10 years old
Radiology Cases of Transient Synovitis of Hip


