Validation of an 18-item version of the Swedish Knee Self-Efficacy Scale for patients after ACL injury and ACL reconstruction

Journal of Experimental Orthopaedics

Table 5 Correlation between the subscale present of the K-SES₁₈, the KOOS subscales and the ACL-RSI

Follow-ups	KOOS	KOOS	KOOS	KOOS	KOOS	ACL-RSI
	pain	symptoms	ADL	sports	QoL	ACL-RSI
	r	r	r	r	r	r
10 weeks after ACL injury	.627**	.548**		.758**	.632**
4 months after ACL injury	.595**	.473**		.759**	.673**
8 months after ACL injury	.666**	.521**		.755**	.741**	.481**
12 months after ACL injury	.628**	.569**	.742**	.814**	.775**	.594**
18 months after ACL injury	.758**	.680**		.760**	.718**	.639**
Preoperative^a	.667**	.609**	.685**	.729**	.653**
10 weeks after ACL reconstruction	.474**	.434**		.634**	.517**
4 months after ACL reconstruction	.476**	.413**		.701**	.531**
8 months after ACL reconstruction	.547**	.507**		.738**	.612**	.525**
12 months after ACL reconstruction	.592**	.515**	.630**	.746**	.657**	.608**
18 months after ACL reconstruction	.617**	.523**		.801**	.681**	.647**

ACL Anterior Cruciate Ligament, ACL injury refers to patients treated with rehabilitation, ACL reconstruction refers to patients treated with reconstruction and rehabilitation, ACL-RSI Anterior Cruciate Ligament Return to Sport Index, KOOS Knee injury and Osteoarthritis Outcome Score, K-SES₁₈ the 18-item version of the Knee-Self-Efficacy Scale, QoL quality of life
**p < 0.01