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Table 3 Comparison of shape parameters among different trochlear types

From: Do size, shape, and alignment parameters of the femoral condyle affect the trochlear groove tracking? A morphometric study based on 3D- computed tomography models in Chinese people

  Type 45° Type 60° Type 75° Type 90° p-value
Aspect ratio 0.9 (0.0) 1.0 (0.0) 1.0 (0.1) 1.0 (0.0) p1* = 0.034
p2* = 0.001
p3* = 0.032
Arc angle,° 104.6 (6.3) 107.9 (8.2) 107.8 (8.2) 111.9 (8.4) p7 = 0.003
p8 = 0.030
Proximal-end angle,° 1.4 (5.7) 0.7 (5.7) 0.7 (4.7) −1.9 (6.6) 0.126
Distal-end angle,° 16.0 (3.5) 18.6 (5.1) 18.5 (6.1) 20.0 (6.5) p4* = 0.043
p5* = 0.016
p6* = 0.018
  1. All parameter values are reported as mean (standard deviation)
  2. Aspect ratio, the ratio between the anteroposterior dimension of the lateral condyles and the femoral mediolateral dimension; Arc angle, the angulation between the most proximal cutting plane and the most distal cutting plane; Proximal-end angle, the angulation between the most proximal cutting plane and the 0° cutting plane; Distal-end angle, the angulation between the most distal cutting plane and the 90° cutting plane
  3. *There were significant differences when comparing type 45° with types 60° (p1, p4), 75° (p2, p5), and 90° (p3, p6) in terms of aspect ratio and distal-end angle, respectively
  4. There were significant differences when comparing type 45° with type 90° (p7), and type 75° with type 90° (p8) in terms of arc angle