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Table 2 Comparison of radiographic data between the patellofemoral OA progression and non-progression group

From: Preoperative flexion contracture is a predisposing factor for cartilage degeneration at the patellofemoral joint after open wedge high tibial osteotomy

  Preoperative P value Postoperative P value
Group P Group N Group P Group N
Correction angle (degrees)    9.0 ± 2.8 8.7 ± 2.1 0.80
HKA (degrees) 6.0 ± 4.6 varus 5.9 ± 4.9 varus 0.96 3.1 ± 2.5 valgus 2.9 ± 2.2 valgus 0.75
Percentage MA 21.0 ± 11.6 23.5 ± 9.9 0.38 60.1 ± 6.5 60.2 ± 5.2 0.95
MPTA (degrees) 82.5 ± 2.4 83.4 ± 1.5 0.10 91.7 ± 2.1 92.3 ± 1.5 0.25
Posterior tibial slope (degrees) 8.6 ± 3.8 8.3 ± 3.2 0.73 8.4 ± 3.6 8.9 ± 3.6 0.64
Patellar tilt (degrees) 9.0 ± 4.5 9.1 ± 5.8 0.90 7.9 ± 4.2 7.1 ± 5.0 0.57
Caton-Deschamps index 0.94 ± 0.20 0.91 ± 0.11 0.51 0.76 ± 0.21 0.78 ± 0.12 0.63
TT-TG distance (mm) 11.2 ± 2.9 11.5 ± 3.4 0.79 11.7 ± 3.2 11.4 ± 2.9 0.80
  1. OA osteoarthritis, HKA hip-knee-ankle angle, MA mechanical axis, MPTA medial proximal tibial angle, TT-TG tibial tuberosity-trochlea groove