Table 2.

Association between preoperative pain catastrophizing score and change in Oxford Knee Score (OKS) from preoperatively to 12 months postoperatively

	OKS total score
Variable	Change in OKS a	(95% CI)	P value
TKA (n = 419)
PCS < 11	ref
PCS =11–21	0.9	(−1.5, 3.2)	0.47
PCS > 21	3.2	(1.0, 5.4)	0.005
UKA (n = 162)
PCS < 11	ref
PCS = 11–21	4.3	(1.5, 7.1)	0.003
PCS > 21	5.4	(2.2, 8.6)	0.001

^aAdjusted for sex, age, BMI, alcohol, smoking, operated bilateral (patients having two arthroplasties within 12 months) and co-morbidity