Results
Osteoarthritis, Knee Injury, blood loss, pain, RBC loss
BLOOD LOSS, OSTEOARTHRITIS
Among the 66 patients who were enrolled in this study, 3 patients were excluded from the final analysis due to unintentional discontinuation of the drainage tube before the 48-hour time point after surgery. The remaining 63 patients (32 patients in the conventional group and 31 patients in the ABN group) completed the study (Fig. 
Preoperative demographics and perioperative characteristics of study patients compared between the conventional group and the ABN group A Abbreviations: ABN, accelerometer-based navigation system; KOOS, Knee Injury and Osteoarthritis Outcome Score; SD, standard deviationRegarding postoperative outcomes, there was no significant difference between groups relative to postoperative Hct level at 24, 48, and 120 h after surgery. Drainage blood loss at 24 and 48 h, and total drainage blood loss were all lower in the ABN group than in the conventional group, but all 3 of those differences failed to achieve statistical significance. Concerning the primary outcome, the mean calculated total RBC loss was 630.0 ± 277.8 mL (range: 266.0–1,282.1) and 669.7 ± 279.7 mL (range: 302.3–1,290.7) in the conventional group and ABN group, respectively (
Postoperative outcome variables compared between the conventional group and the ABN group A Abbreviations: ABN, accelerometer-based navigation system; SD, standard deviationPostoperative pain intensity tended to be lower in the conventional group with very close to statistically significant difference between groups observed at 72 and 120 h after surgery (higher pain score in the ABN group for both) (Fig. 
The mean postoperative VAS score compared between the conventional group and the ABN group at 24, 48, 72, 96, and 120 h after surgery. The difference in pain score was very close to being significantly higher in the ABN group at the 72-hour and 120-hour time points. A 