Statistical Analysis
baseline-adjustment [
Data of all participants who completed the pre- and postoperative measurements were included in the statistical analysis and were checked for normal distribution with the Shapiro-Wilk test. Differences between groups in the participants characteristics were examined using independent t-tests (age, weight, BMI), Mann-Whitney-U-test (height) or Fisher's exact tests (sex, joint) depending on normal distribution and scale level. The between-group comparison at three and six months after surgery was performed using an analysis of covariance (ANCOVA) with baseline-adjustment [