Data Set

This cohort study comprises 1233 patients who underwent THA (n = 713) or TKA (n = 520) at our institution between 2006 and 2010. Patient demographic data including the age, sex, and joint replaced were collected. Patient-reported scores (OHS/OKS and the SF-12) were collected preoperatively and postoperatively (at approximately 1 year) using an arthroplasty audit database (OrthoWave, Stryker, Sydney, Australia). SF-12 PCS and MCS and SF-6D scores were calculated using responses to individual questions from the SF-12 [9,10]. To enable comparability with results from other studies, we also report EQ-5D-3L scores that were mapped from the SF-12 scores [EQ-5D(SF-12)] using a published crossover algorithm [12]. The SF-6D has half the range of the EQ-5D-3L and a correspondingly lower minimum important difference (MID) (0.041) than the EQ-5D (0.074) [13]. The MID for OHS and OKS was taken as 5 points [14]. The MID for SF-12 PCS and MCS was also taken as 5 points [15].