Hip pain and varicella infections are common diagnoses affecting children and adolescents. Hip pain in childhood can be a challenging presenting complaint for the pediatrician or orthopedic physician. The differential diagnosis is broad, and ranges from benign conditions, such as transient synovitis and muscle strains, to more serious infections or malignancies. Acute hip pain is usually referred to an orthopedic surgeon, and the principal concern is to distinguish infection of the hip joint or pelvis from an irritable hip or musculoskeletal pain. The Varicella-zoster virus, a member of the herpes virus family, often presents as a generalized, pruritic, vesicular rash. The primary infection is commonly known as chickenpox. The prevalence of varicella infections has decreased significantly over the past decade with use of the varicella vaccine. Reactivation of varicella infection, or herpes zoster, in patients younger than 20 years is seen in only 68 per 100,000 people. Hip pain as the presenting symptom for onset of a herpes zoster infection is rare. This article presents a case of herpes zoster infection with initial presentation of hip pain in a 13-year-old boy. This case highlights the difficulty in diagnosing atraumatic joint pain in the pediatric population. The clinical importance of a thoughtful differential diagnosis, and the necessity of close follow-up by a pediatrician and/or orthopedic surgeon until there is a confirmed diagnosis cannot be overstated.
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