Statistics

We used SPSS (Statistical Package for the Social Sciences® version 21 (IBM Corp, Armonk, NY, USA) for statistical analyses. Data are presented as numbers, proportions (%), and means with 95% confidence intervals (95% CI), ranges, or standard deviation (SD). Paired Student’s t-tests were used to analyze changes in the scores. Pearson and Spearman’s correlation analyses were used to evaluate associations between age and preoperative PROM scores, postoperative PROM scores, changes in scores, and satisfaction rate. We used ANOVA to compare outcomes between groups (different diagnoses and different prosthetic designs) followed by Tukey post-hoc analyses when statistically significant group differences were found. The influence of preoperative SEFAS on postoperative outcome was analyzed by partial correlation analysis adjusted for age. A p-value of <0.05 was considered statistically significant.