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Table 2 Mean Change in WOMAC and RAND-36 General Health Between Measurement Periods

From: A Randomized controlled trial comparing patellar retention versus patellar resurfacing in primary total knee arthroplasty: 5–10 year follow-up

  Resurfaced Non-resurfaced P value*
Stiffness
Mean Change from preop to 1 year postop (SD) 24.4 ± 24.5 8.3 ± 32.3 0.10
Mean Change from 1 year to 5 years postop (SD) 15.5 ± 22.1 16.3 ± 24.7 0.66
Mean Change from 5 years to 10 years postop (SD) 3.4 ± 33.6 15.0 ± 19.4 0.35
Pain
Mean Change from preop to 1 year postop (SD) 32.9 ± 18.2 34.3 ± 21.5 0.83
Mean Change from 1 year to 5 years postop (SD) 3.8 ± 17.7 3.1 ± 22.3 0.93
Mean Change from 5 years to 10 years postop (SD) 12.7 ± 20.0 10.0 ± 12.0 0.71
Function
Mean Change from preop to 1 year postop (SD) 24.1 ± 16.6 19.5 ± 16.9 0.44
Mean Change from 1 year to 5 years postop (SD) −3.8 ± 15.9 5.5 ± 19.8 0.18
Mean Change from 5 years to 10 years postop (SD) 14.2 ± 17.7 14.4 ± 13.6 0.98
RAND-36 General Health
Mean Change from preop to 1 year postop (SD) −8.2 ± 17.5 5.8 ± 10.6 0.02
Mean Change from 1 year to 5 years postop (SD) −3.7 ± 14.4 −9.0 ± 19.1 0.43
Mean Change from 5 years to 10 years postop (SD) −6.0 ± 15.8 −3.8 ± 15.4 0.75
  1. LEGEND: SD = Standard Deviation.
  2. * Analyzed using an Independent T-test.