Table 3.

Surgical technique and risk of contralateral ACL reconstruction

Group				HR			Adjusted HRa
				HR	95% CI	P value	HR	95% CI	P value
Comparison group	No. of eventsb	Reference group	No. of eventsb
TP reference (n = 6685)	n = 153	TP anatomic (n = 4036)	n = 99	1.159	0.899–1.493	0.254	1.147	0.890–1.478	n.s.
TT non-anatomic (n = 1296)	n = 54			0.957	0.686–1.337	0.789	0.951	0.681–1.329	n.s.
TT anatomic (n = 2158)	n = 96			1.241	0.936–1.645	0.134	1.226	0.925–1.626	n.s.
TT partial-anatomic (n = 1516)	n = 55			0.828	0.594–1.154	0.265	0.859	0.617–1.198	n.s.
All landmarks (n = 9397)	n = 246	No landmarks (n = 831)	n = 41	1.144	0.815–1.604	0.437	1.152	0.821–1.617	n.s.
Both footprints (n = 14,236)	n = 401	No footprints (n = 1270)	n = 53	1.226	0.918–1.637	0.167	1.250	0.936–1.669	n.s.
Both ridges (n = 10,576)	n = 276	No ridges (n = 3173)	n = 111	1.157	0.925–1.446	0.201	1.145	0.915–1.432	n.s.
TP Drilling (n = 12,440)	n = 314	TT Drilling (n = 5109)	n = 208	1.034	0.866–1.236	0.709	1.034	0.865–1.236	n.s.

CI confidence interval, HR hazard ratio, TP transportal, TT transtibial

^aMultivariate Cox regression analysis adjusted for patient sex, patient age and meniscal or chondral injury

^bEvent = contralateral ACL surgery