Table 4.

Surgical technique and risk of revision ACL surgery

				HR			ADJUSTED HRa
Group				HR	95% CI	P value	HR	95% CI	P value
Comparison group	No. of eventsb	Reference group	No. of eventsb
TT-non-anatomic (n = 1296)	n = 40	TP-reference (n = 6685)	n = 162	0.704	0.497–0.998	0.049	0.694	0.490–0.984	0.041
TT-anatomic (n = 2159)	n = 77			0.942	0.717–1.239	n.s.	0.944	0.718–1.241	n.s.
TT-partial anatomic (n = 1516)	n = 48			0.723	0.522–1.001	n.s.	0.759	0.548–1.051	n.s.
TP-anatomic (n = 4036)	n = 146			1.285	1.027–1.607	0.028	1.310	1.047–1.640	0.018
All landmarks (n = 9398)	n = 252	No landmarks (n = 831)	n = 27	1.387	0.928–2.072	n.s.	1.392	0.931–2.081	n.s.
TP drilling (n = 12,440)	n = 380	TT-drilling (n = 5110)	n = 167	1.390	1.157–1.670	<0.001	1.399	1.163–1.682	<0.001

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 = revision ACL surgery