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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

Outcomes

NAVIO 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 (%)

  Male

4 (25.0)

4 (23.5)

0.922

  Female

12 (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 angle

16

17

–

  Acceptable femur flexion/extension angle

16

17

–

  Acceptable tibia varus/valgus angle

16

17

–

  Acceptable tibia posteroinferior angle

16

17

–

 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 yr

0

0

–

 Revisions at 1 yr

0

0

–

  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
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Knee Surgery & Related Research

ISSN: 2234-2451