Clinico-radiological diagnosis and grading of rapidly progressive osteoarthritis of the hip.

The principal symptom in all patients was hip pain, with onset of a median of 3 years (IQR 7) before THR in patients with RPOH, compared to the median of 5 years (IQR 19) in POH; thus there was a highly significant difference in disease onset ( P = 0.0001, Mann–Whitney test, Fig. 4 A).

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Although there were also differences in disease bilaterality, these did not reach statistical significance ( P = 0.68, Table 3 ).

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