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Table 3 Time-trends in 2-year post-primary TKA pain and functional limitation outcomes

From: Are outcomes after total knee arthroplasty worsening over time? A time-trends study of activity limitation and pain outcomes

  1993-1995 (n ~ 1,510)* 1996-1998 (n ~ 1,646)* 1999-2001 (n ~ 1539)* 2002-2005 (n ~ 2,480)* Absolute Difference (period 1 -period 4) p-value for time-trend
2-year walking limitations       <0.001
  None/Mild 80.4% 75.0% 72.9% 71.8%   
  Moderate/Severe 19.6% 25.0% 27.1% 28.2% +8.6%  
       0.001
2-year stairs limitations       
  None/Mild 62.6% 59.5% 62.0% 56.6%   
  Moderate/Severe 37.4% 40.5% 38.0% 43.3% +5.9%  
2-year chair limitations       0.57
  None/Mild 91.0% 91.7% 92.1% 92.3%   
  Moderate/Severe 9.0% 8.3% 7.9% 7.7% -1.3%  
2-year walking aids       0.14
  No/mild dependence** 88.0% 88.3% 88.9% 88.8%   
  Moderate dependence 4.5% 5.8% 5.4% 4.9% +0.4%  
  Complete dependence or unable to walk 7.5% 5.9% 5.7% 6.2% -0.7%  
2-year overall ADL limitations       0.018
  None/Mild 81.0% 77.3% 77.7% 76.3%   
  Moderate/Severe 19.0% 22.7% 22.3% 23.7% +4.7%  
2-year TKA pain       <0.001
  None/Mild/Stairs/Stairs and walking 95.0% 93.3% 93.5% 91.4%   
  Moderate/Severe 5.0% 6.7% 6.5% 8.6% +3.6%  
  1. *Missingness ranged from 1% to 3% for various variables, since not all the patients answered each question on the survey.
  2. **No/mild dependence, no supports or cane long walk.