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Table 3 Mechanical alignments measured at 6 weeks post-operation compared between the iAssist and the conventional group

From: Alignment accuracy and functional outcomes between hand-held navigation and conventional instruments in TKA: a randomized controlled trial

Mechanical alignment

iAssist

(n = 30)

Conventional

(n = 30)

P value

Hip-knee-ankle angle, degree

179.7 ± 2.2

178.9 ± 2.9

0.250

Hip-knee-ankle angle outlier

4 (13.3%)

8 (26.8%)

0.101

Femoral coronal alignment, degree

89.4 ± 2.2

87.7 ± 2.1

0.003

Femoral coronal alignment outliner

3 (10%)

7 (23.3%)

0.086

Tibial coronal alignment, degree

90.1 ± 1.1

90.7 ± 1.5

0.096

Tibial coronal alignment outlier

0 (0%)

2 (6.7%)

0.078

Femoral sagittal alignment, degreea

3.8 ± 2.0

3.2 ± 1.9

0.267

Femoral sagittal alignment outlier

3 (10%)

2 (6.7%)

0.321

Tibial slope, degreeb

3.8 ± 2.3

3.6 ± 1.9

0.668

Tibial slope outlier

2 (6.7%)

2 (6.7%)

0.5

  1. Notes: data presented as mean ± standard deviation for continuous and frequency (%) for categorical data
  2. aFemoral sagittal alignment = 90 – FSA (+ component flexion, - component extension)
  3. bTibial slope = 90 – TSA (+ posterior slope, - anterior slope)