2.4. Measurements
pain
SECONDARY
The following patient information was collected preoperatively: age, sex, body mass index (BMI), diagnosis, visual analogue scale (VAS) score, knee joint ROM, and Kellgren–Lawrence classification for the operated and nonoperated sides. For postoperative evaluation, the time from return to first use of rescue analgesia and the total amount of rescue analgesia during the study period were also measured. VAS scores and ROM on the operated side were measured immediately before and after CPM on postoperative days 2, 4, 7, and 14. The 10 m walk test was performed on postoperative days 7 and 14 to evaluate walking ability. The primary outcome was the difference in the VAS scores before and after CPM on postoperative day 14. This primary outcome was selected based on the expectation that the impact of nociceptive pain associated with surgery decreases in 2 weeks. The secondary outcome was the difference in the ROM before and after CPM and the 10 m walk test result on postoperative day 14.