Key factors in determining surgical timing of total knee arthroplasty in osteoarthritic patients: age, radiographic severity, and symptomatic severity

Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 2 Results of the regression analyses to evaluate the associations between the preoperative factors and the postoperative outcomes

Preoperative factor	PO WOMAC pain score		PO WOMAC function score^a		Patient satisfaction
Preoperative factor	β coefficient	P value	β coefficient	P value	Odds ratio [95% CI]	P value
Age	0.101	0.118	0.232	<0.001	0.931 [0.849–1.021]	0.130
Radiographic OA score	−0.024	0.700	−0.078	0.193	1.119 [0.833–1.503]	0.456
Preoperative WOMAC score
Pain	0.189	0.002	0.041	0.621	0.866 [0.730–1.027]	0.097
Function	−0.031	0.717	0.205	<0.001	1.018 [0.960–1.080]	0.551

The associations between the preoperative factors and the postoperative WOMAC scores were tested using the linear regression analysis, while the associations between the preoperative factors and patient satisfaction were tested using the logistic regression analysis
PO Postoperative, WOMAC Western Ontario and McMaster Universities Osteoarthritis Index, OA osteoarthritis, CI confidence interval
^aAs the postoperative range of motion was associated with the postoperative WOMAC function score (β coefficient = −0.179, P = 0.003), the confounding effect was controlled with multivariate regression analysis