Does the accelerometer-based navigation system reduce blood loss and transfusion in one-stage sequential bilateral total knee arthroplasty? A randomized double-blind controlled trial

Table 1 Preoperative demographics and perioperative characteristics of study patients compared between the conventional group and the ABN group

Characteristics	Conventional group (n = 32) Mean ± SD or n (%)	ABN group (n = 31) Mean ± SD or n (%)	p-value
Age (years)	70.0 ± 6.6	70.9 ± 6.0	0.568
Gender			0.634
Female	30 (90.9%)	27 (87.1%)
Male	3 (9.1%)	4 (12.9%)
Body mass index (kg/m²)	28.1 ± 4.1	26.7 ± 3.3	0.152
Charlson Comorbidity Index			0.519
0 to 1	24 (72.7%)	21 (67.7%)
≥2	9 (27.3%)	10 (32.3%)
Preoperative KOOS	38.5 ± 14.1	37.9 ± 12.4	0.865
Total blood volume (mL)	2,912.5 ± 412.2	2,906.5 ± 383.9	0.952
Preoperative hematocrit level (%)	40.6 ± 3.1	38.6 ± 4.1	0.053
Preoperative platelet count (x10³/mm³)	245.0 ± 75.7	244.2 ± 51.7	0.960
Total intraoperative tourniquet time (minutes)	139.3 ± 26.5	151.7 ± 26.0	0.070

A p-value < 0.05 indicates statistical significance.
Abbreviations: ABN, accelerometer-based navigation system; KOOS, Knee Injury and Osteoarthritis Outcome Score; SD, standard deviation

ISSN: 1471-2474