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Table 1 Characteristics of patients who underwent NAVIO and MAKO robotically assisted unicompartmental knee arthroplasty at baseline, intraoperatively, and 1 year postoperatively

From: Comparison of 1-year outcomes between MAKO versus NAVIO robot-assisted medial UKA: nonrandomized, prospective, comparative study

OutcomesNAVIO robotically assisted UKA
(n = 16)
MAKO robotically assisted UKA
(n = 17)
P value
Baseline characteristics
 Age, yr, mean (SD)70.9 (5.9)71.5 (6.3)0.573
 Sex, n (%)
  Male4 (25.0)4 (23.5)0.922
  Female12 (75.0)13 (76.5) 
 Weight, kg, mean (SD)64.8 (9.5)62.4 (9.3)0.479
 Height, cm, mean (SD)157.8 (7.0)155.1 (4.8)0.203
 BMI, kg/m2, mean (SD)26.0 (3.17)25.8 (3.3)0.912
 Preoperative ROM in flexion, degrees, mean (SD)130 (5.5)129.4 (5.8)0.768
 Preoperative ROM in extension, degrees, median (range)0 (0–5)0 (0)0.07
 Preoperative KSS, mean (SD)70.3 (5.6)72.3 (4.5)0.265
 Preoperative KFS, mean (SD)65.5 (7.9)67.3 (7.8)0.515
Intraoperative results
 Method of anesthesia
 Epidural anesthesia (%)14 (87.5)16 (0.94)0.509
 General anesthesia (%)2 (12.5)1 (0.06) 
 Tourniquet time, minutes, mean (SD)113.6 (8.4)109.4 (18.7)0.416
 All seven surgical step time, min, mean (SD)98.0 (8.4)82.5 (11.8)0.0002
 Operative time, min, mean (SD)134.4 (9.3)130.4 (20)0.472
 Blood loss, ml, median (range)136.3 (108–155)80 (68–132)0.006
Postoperative results
 Hospital stay, d, mean (SD)4.8 (1.2)4.4 (1.1)0.406
 Radiographic postoperative findings
  Acceptable femur varus/valgus angle1617
  Acceptable femur flexion/extension angle1617
  Acceptable tibia varus/valgus angle1617
  Acceptable tibia posteroinferior angle1617
 ROM in flexion at 1 yr, degrees, mean (SD)130.3 (5.6)131.2 (6.7)0.693
 ROM in extension at 1 yr, degrees, mean (SD)0 (0)0 (0)
 Knee Functional Score at 1 yr, mean (SD)99.9 (0.25)99.5 (1.2)0.203
 Knee Society Score at 1 yr, mean (SD)96.9 (5.7)94.7 (10.1)0.457
 Postoperative complications at 1 yr00
 Revisions at 1 yr00
  1. Acceptable femur varus/valgus angle of the femoral component relative to the femur is < 10 degrees varus to < 10 degrees valgus)
  2. Acceptable femur flexion/extension angle of the femoral component relative to the femur is within 15-degree flexion to 0-degree extension
  3. Acceptable tibia varus/valgus angle of the tibial component relative to the tibia is < 5 degrees varus to < 5 degrees valgus
  4. Acceptable tibia posteroinferior tilt of the tibial component relative to the tibia is 7 ± 5 degrees
  5. Abbreviations: BMI body mass index, KFS Knee Functional Score, KSS Knee Society Score, ROM range of motion, UKA unicompartmental knee arthroplasty