Table 3.

Multivariable Linear Regression Analyses for the KOOS and IKDC at 6 and 12 Months. Abbreviations: FAM = fear-avoidance model, KOOS = Knee Injury and Osteoarthritis Outcome Score, IKDC = International Knee Documentation Committee

	6 Months			12 Months
	Unstandardized Beta [95% CI]	Standardized Beta	p	Unstandardized Beta [95% CI]	Standardized Beta	p
KOOS Sport/Recreation
Moderate-to-high FAM risk	−9.9 [−20.0 to .2]	−.27	.05	−7.1 [−16.7 to 2.5]	−.21	.15
Expectation of surgical success	−3.7 [−8.1 to .6]	−.23	.09	.4 [−3.6 to 4.4]	.03	.85
KOOS Quality of Life
Moderate-to-high FAM risk	−9.4 [−21.0 to 2.2]	−.24	.11	−17.5 [−29.9 to −5.0]	−.42	.007
Expectation of surgical success	−3.9 [−8.8 to 1.0]	−.23	.12	−5.1 [−10.1 to .01]	−.29	.05
IKDC
Moderate-to-high FAM risk	−7.6 [−14.6 to −.5]	−.29	.04	−13.0 [−20.7 to −5.4]	−.47	.001
Expectation of surgical success	−4.1 [−7.1 to −1.1]	−.36	.008	−2.5 [−5.6 to .6]	−.22	.11

Regression models controlled for age, sex, and preoperative outcome score (*Marx used for KOOS Sport/Recreation)