We performed the statistical comparison of demographic data between the AL and PFF groups with Student’s two sample t-test for continuous variables (age, time to revision, length of surgery, blood loss, BMI, length of stay) and Fisher’s exact test for discrete variables (gender, cup revision rate).

We used the Wilcoxon test to compare OHS and VAS results (non-parametric data), two sample or signed design as required.

We analysed the intra-, and interobserver agreement between the numerical GRxS results with intraclass correlation coefficient (ICC) test. For the categorical GRxS results we performed Cohen’s-Kappa for intraobserver and Fleiss-Kappa for interobserver reliability.

For the statistical analysis of the GRxS results, we used both the numerical results and the categorical evaluation “very good”, “good”, “average” and “poor”. The patients were grouped accordingly.

We compared the GRxS measurements between the different timepoints with the Friedman test, KendallW was calculated and for the post-hoc analysis we used the paired Wilcoxon signed-rank test.

For assessing the correlation between GRxS with OHS and VAS values we made Spearman’s rank correlation test.

The significance level was determined at 5% (α = 0,05).

Statistical analyses were performed using the R software (version 3.6.2; The R Foundation for Statistical Computing, Wien, Austria).

Our observational study has obtained the approval of the Clinical Research Coordination Office of the University of Szeged, with the registration number: 3/2019-SZTE. Written consent was attained from all patients involved.

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