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Table 4 Comparisons of preoperative and 5-year postoperative clinical and radiological outcomes

From: No patella resurfacing total knee arthroplasty leads to reduction in the thickness of patellar cartilage to less than half within 5 years: a quantitative longitudinal evaluation using MRI

  Preoperative 5-year postoperative P-value
FTA (°) 184.0 (4.4) 173.6 (3.4) < 0.0001
MA (%) 1.8 (18.4) 48.3 (12.5) < 0.0001
Insall–Salvati ratio 1.1 (0.13) 1.0 (0.15) 0.1521
Caton–Deschamps index 1.0 (0.11) 0.98 (0.11) 0.4606
Tilting angle (°) 5.5 (3.4) 4.6 (4.4) 0.1583
Congruence angle (°) 9.3 (9.0) 9.3 (10.0) 0.6018
Lateral shift ratio (%) 7.8 (5.4) 14.8 (6.0) < 0.0001
Condylar twist angle (°) 2.7 (1.8) 2.8 (1.7) 0.9525
  1. Data are reported as the mean (standard deviation), unless otherwise indicated. Bolded P-values indicate statistical significance (P < .05)
  2. Significance levels with Student’s t-test
  3. FTA lateral femorotibial angle, MA mechanical axis