Hip Pain and Malignant Bone Tumors

Transient Synovitis of Hip AKA Toxic Synovitis

Inflammation of Hip Joint

Etiology unclear: Follows upper respiratory infection, trauma, bacterial infection, and postvaccine or drug-mediated reactions cited as causes

Epidemiology: Predominant sex is males approx 4:1 ratio. Most common cause of acute hip pain in children ages 3-10 years old

Symptoms: Abrupt onset of hip pain, thigh pain, groin pain, knee pain, afebrile or low grade fever, walk with limp, decreased range of motion (abduction)

Lab studies: Do not have elevation of serum white blood cell count (WBC), erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP)

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