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Table 1 Comparisons of patient and surgical factors between groups

From: Intraoperative patellar maltracking and postoperative radiographic patellar malalignment were more frequent in cases of complete medial collateral ligament release in cruciate-retaining total knee arthroplasty

  Group 1a (n = 67) Group 2b (n = 75) P value
Age (years) 72.1 ± 7.4 69.1 ± 7.1 0.015c
Sex (male:female) 12:55 9:66 0.352d
Height (cm) 152.1 ± 8.6 151.1 ± 6.2 0.421c
Weight (kg) 59.9 ± 10.9 63.0 ± 8.5 0.061c
BMI (kg/m2) 25.4 ± 4.8 27.6 ± 3.3 0.002c
Preoperative flexion contracture (degrees) 4.3 ± 8.8 5.2 ± 8.6 0.551c
Preoperative further flexion (degrees) 137.0 ± 7.6 135.9 ± 9.4 0.427c
Preoperative mechanical axis (degrees) Varus 8.4 ± 6.6 Varus 8.2 ± 5.9 0.855c
Postoperative mechanical axis (degrees) 0.5 ± 2.1 0.4 ± 2.0 0.752c
Preoperative patellar tilt (degrees) 3.7 ± 3.3 3.8 ± 3.6 0.876c
Postoperative patellar tilt (degrees) 2.3 ± 3.4 5.7 ± 4.5 0.017c
Preoperative patellar displacement (mm) 4.1 ± 2.6 6.0 ± 3.5 <0.001c
Postoperative patellar displacement (mm) 1.1 ± 1.5 4.0 ± 2.2 <0.001c
Preoperative Insall-Salvati ratio 0.9 ± 0.1 0.9 ± 0.1 0.520c
Preoperative Blackburne-Peel ratio 1.3 ± 0.1 1.5 ± 0.2 0.108c
Preoperative patellar thickness (mm) 21.5 ± 2.0 21.5 ± 1.5 0.832c
Postoperative patellar thickness (mm) 21.4 ± 1.5 21.3 ± 1.2 0.711c
MCL release (yes:no) 3:64 24:51 <0.001d
PCL release (yes:no) 10:57 15:60 0.511d
Femoral valgus cut angle (degrees) 6.3 ± 0.8 6.0 ± 0.8 0.034c
Distal femoral cut rotation (degrees) 4.6 ± 1.4 4.5 ± 1.6 0.686c
  1. aGroup 1: normal patellar tracking intraoperatively and postoperatively
  2. bGroup 2: patellar maltracking intraoperatively or postoperatively
  3. cStudent t test
  4. dChi-square test