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

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

*Missingness ranged from 1% to 3% for various variables, since not all the patients answered each question on the survey.
**No/mild dependence, no supports or cane long walk.

ISSN: 1471-2474