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Table 3 Evaluation of factors the affect range of motion after two-stage revision arthroplasty (multiple regression analysis, stepwise method)

From: Factors affecting range of motion following two-stage revision arthroplasty for chronic periprosthetic knee infection

Dependent variable

Independent variables

Unstandardized coefficients

Standardized coefficients β

P

B

SE (B)

ROM after second-stage surgery (last FU ROM)a

ROM after first-stage surgery

0.604

0.033

0.811

< 0.001

No. (1st–2nd), nb

 − 8.847

2.306

 − 0.162

< 0.001

Interval (1st–2nd), weeksc

 − 0.778

0.258

 − 0.130

0.003

Body mass index

 − 0.698

0.337

 − 0.085

0.041

  1. ROM Range of motion, SE standard error
  2. aLast FU ROM refers to follow-up range of motion (24.6 ± 7.9 months after second-stage surgery)
  3. bNumber of cases where additional surgery was performed before the second-stage surgery
  4. cInterval between the first-stage surgery and the second-stage surgery