Objective: To study whether clinical symptoms and signs can predict radiological osteoarthritis (OA) of the hip in primary care patients with hip pain.
Methods: Consecutive patients (n = 220) aged 50 years or older consulting the general practitioner for hip pain and referred for radiological investigation underwent a standardized history, radiological, laboratory, and physical examination. Radiological OA was confirmed with joint space < or = 2.5 mm. Additionally, a more stringent definition was used (< or = 1.5 mm). The relationship between radiological OA and possible clinical symptoms/signs of OA was tested. Combinations of clinical symptoms/signs that had shown an independent relationship with radiological OA in multivariate analyses were tested for their predictive value.
Results: Radiological OA (joint space < or = 2.5 mm) of the (more) symptomatic hip was present in 35.5% of the study population and more severe OA (joint space < or = 1.5 mm) in 11.4%. Presence of 4 specific symptoms/signs from history and examination showed a positive predictive value (PPV) of 73% (specificity 91%, sensitivity 45%) for radiological OA. When 5 specific symptoms/signs were present, the PPV for the more severe radiological OA was 82% (specificity 98%, sensitivity 72%), and when 6 or 7 specific symptoms/signs were present the PPV was 100% (specificity 100%, sensitivity 40% and 8%, respectively). Negative predictive values were high for almost all combinations.
Conclusion: In primary care patients with hip pain, clinical symptoms and signs can to a moderate extent predict radiological OA and to a large extent more severe radiological OA.
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