A descriptive analysis was carried out (means, standard deviations, quartiles, maximum and minimum values) for each variable. For qualitative variables, the absolute and relative frequencies were calculated. A paired t test was used to compare MME preoperatively and postoperatively.2 (link) The Pearson correlation coefficient was used to measure the degree of relationship between scores.2 (link) The statistical analysis was carried out using SPSS Version 17.0 for Windows (SPSS Inc). Considering the reduction of MME after HTO as the main analyzed outcome, for a power analysis of 80% with a 5% level of significance, a patient sample size of 62 was needed.