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Chapter 7 88 Postoperative complications, i.e. superficial wound infections, deep wound infections, non-unions and secondary dislocations, or other additional adverse situations that required medical intervention, were recorded as either present or non-present, along with the type of complication. Removal of implants was only performed in case of functional complaints. All patients’ compliance were monitored for 3 months after surgery with the OpenGo insole (Moticon GmbH, Munich, Germany).20 The insole incorporates 13 capacitive pressure sensors and a 3D accelerometer, measuring peak pressures (in Newton) and mean weight bearing (in Newton). It operates completely wireless. Data is stored on a flash drive. The insole can be placed in any shoe and shoes can be changed at random during the study due to an automated zeroing system.20 Baseline characteristics, recorded at admission, included age at time of fracture, sex, ASA (American Society of Anesthesiologists) classification (type 1–6),21 Charlson comorbidity score (classifying prognostic comorbidity, a higher score correlating with additional comorbidities),22 type of fracture and in-hospital length of stay (in days). Statistical analysis Statistical analysis was performed with IBM SPSS Statistics (Version 25.0, Armonk, NY). Descriptive statistics were used to describe the demographic data and baseline characteristics for the entire study population. Independent samples t-tests were used for normally distributed continuous data, and chi-squared tests for categorical variables. In the case of non-parametric data, the median with the interquartile range was calculated. Furthermore, a linear mixed model was used to identify any differences among the outcome measures over time. This analysis ensured that both random and cluster effects, such as treatment in different hospitals, and fixed effects, such as ASA classification, could be considered and corrected for. Results are presented as either mean (standard deviation) or frequencies and percentages. The level of statistical significance was set at ɲ=0.05. The data was analyzed blinded by the researchers. Results Baseline characteristics A total of 106 patients were included in this cohort study: N=53 in each of the PWB and RWB groups (Figure 7.1). As the assumption for normality was violated, non-parametric tests were used, and established that the PWB group patients had comparable ASA score (p=0.14) and fewer comorbidities, as measured with the Charlson score, (p=0.03) compared to those in the RWB group. No significant differences in sex, age, type of

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