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Background  We aimed to compare the performance of EQ-5D-3 L and  howRu , which are short generic patient-reported outcome measures (PROMs), in assessing the outcome of hip and knee replacements, using the Oxford Hip Score (OHS) and the Oxford Knee Scores (OKS) for comparison.    Methods  Outcome was assessed as the difference between pre-surgery and 6-month post-surgery scores. We used a large sample from the NHS PROMs database, which used EQ-5D-3 L, and a small cohort of patients having the same operations collected by MyClinicalOutcomes (MCO), which used  howRu . Both cohorts completed the OHS (hips) or the OKS (knees).    Results  The change (outcome) between pre-op and post-op scores as measured by  howRu  was greater than that measured by EQ-5D, relative to that measured by OHS or OKS.  For hip replacements, the correlation for change measured by  howRu  and OHS was  r  = 0.77 (0.66–0.85). The corresponding correlation for change measured by EQ-5D Index and OHS was  r  = 0.64 (0.63–0.64).  For knee replacements the correlation between change in  howRu  and OKS was  r  = 0.86 (0.75–0.92); between EQ-5D Index and OKS  r  = 0.59 (0.58–0.60).    Conclusions  For hip and knee replacement, the outcome measured by  howRu  was more highly correlated with that measured by the condition-specific Oxford Hip and Knee Scores than were EQ-5D Index or EQ-VAS. The magnitude of change before and after surgery was also greater.    Electronic supplementary material  The online version of this article (doi:10.1186/s12913-016-1759-x) contains supplementary material, which is available to authorized users.

Performance of EQ-5D, howRu and Oxford hip & knee scores in assessing the outcome of hip and knee replacements