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Table 3 Comparison of preoperative, 1-year postoperative, 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 1-year postoperative 5-year postoperative P-value
ROM (degree)
 Extension −6.2 (10.6) −1.6 (5.4) − 1.78 (5.4) 0.002 a (Pre vs 1-year post: 0.005 b, pre vs 5-years post: 0.008 b)
 Flexion 125.9 (14.7) 115.8 (10.2) 113.5 (8.2) < 0.0001 a (Pre vs 1-year post: < 0.0001 b, pre vs 5-years post: < 0.0001 b, 1-year post vs 5-years post: 0.007 b)
 JOA score (points) 52.3 (10.0) 84.8 (5.0) 77.5 (7.4) < 0.0001 a (Pre vs 1-year post: < 0.0001 b, pre vs 5-years post: < 0.0001 b, 1-year post vs 5-years post: < 0.0001 b)
 Oxford knee score (points) 17.7 (4.4) 35.0 (2.3) 32.3 (3.6) < 0.0001 a (Pre vs 1-year post: < 0.0001 b, pre vs 5-years post: < 0.0001 b, 1-year post vs 5-years post: < 0.0001 b)
  1. Data are reported as mean (standard deviation), unless otherwise indicated. Bolded P-values indicate statistical significance (P < .05)
  2. JOA score Japanese Orthopedic Association score for osteoarthritic knee, ROM range of motion
  3. aOne-way analysis of variance
  4. bSignificant difference between preoperative, 1-year postoperative, and 5-year postoperative groups (post hoc Tukey–Kramer test)