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Table 2 Comparison of patient demographics within the learning curve phases of ROSA TKA

From: Introduction of ROSA robotic-arm system for total knee arthroplasty is associated with a minimal learning curve for operative time

Patient characteristic

Learning phase

(n = 26)

Proficiency phase

(n = 27)

p-value

(Learning vs proficiency)

Age (years)

70.0 ± 10.5

70.6 ± 6.4

NS (0.80)

BMI (kg/m2)

30.8 ± 5.6

32.8 ± 6.0

NS (0.22)

Male gender

10 (39%)

9 (33%)

NS (0.92)

Preoperative Hb (g/L)

134.6 ± 11.7

139.6 ± 13.1

NS (0.15)

Postoperative Hb change (g/L)

22.3 ± 8.1

26.9 ± 10.1

NS (0.07)

Pre-operative HKA (° ± SD)

-4.8 ± 7.8

-8.6 ± 6.4

NS (0.06)

Operative (skin to skin) time (mins)

114.0 ± 17.3

110.8 ± 19.6

NS (0.53)

  1. BMI Body mass index, Hb Haemoglobin, HKA Hip-knee-ankle axis (Varus: > 0°; Valgus < 0°), NS Not significant, SD Standard deviation, TKA Total knee arthroplasty