Periprosthetic Joint Infection Does Not Preclude Good Outcomes after a Revision Total Knee Arthroplasty: A 7-Year Follow-Up Study of 144 Retrospective Cases

Table 3

Results of multivariate regression analysis: relationships between selected variables and four clinical outcomes.

Multivariate analysis	ROM		KSKS		KSFS		HSS
Variable	β  ±  SE^†	P-value	β  ±  SE^†	P-value	β  ±  SE^†	P-value	β  ±  SE^†	P-value
Age	0.6±0.2	0.001
Cause of revision
Preoperative ROM	0.2±0.1	<0.001
Grade 1 femur bone defect (comparator)
Grade 2			–5.8±2.0	0.005	–10.2±3.2	0.002
Grade 3			–21.6±3.4	<0.001	–25.6±4.9	<0.001	–12.9±3.1	<0.001
Grade 1 tibial bone defect (comparator)
Grade 2	–12.9±2.5	<0.001
Grade 3	–16.7±5.3	0.002					–5.5±1.9	0.004
Single surgery (comparator)
Two-stage
Three- or four-stage	–16.1±3.3	<0.001	–10.2±2.5	<0.001			–13. 3±2.5	<0.001
	0.45		0.36		0.16		0.34

Variables with p<0.20 in the univariate analysis were included in the multivariate analysis (stepwise method). Nonsignificant factors were excluded from the table. ROM, range of motion; KSKS, Knee Society knee score; HSS, Hospital for Special Surgery knee score.
^†Values are β  ±  SE.
, percent variance explained by each variable.