Development of a clinical prediction rule for diagnosing hip osteoarthritis in individuals with unilateral hip pain.

Study Design: Prospective cohort/predictive validity study.

Objective: To determine the diagnostic accuracy of common clinical examination items and to construct a preliminary clinical prediction rule for diagnosing hip osteoarthritis (OA) in individuals with unilateral hip pain.

Background: The current gold standard for the diagnosis of hip OA is a standing anteroposterior (AP) radiograph of the pelvis.