Anterior cruciate ligament reconstruction using a double bundle hamstring autograft configuration in patients under 30 years

Table 1 Demographics and re-injury characteristics of the patient sample included in the study that underwent double bundle anterior cruciate ligament reconstruction, together with sub-group analysis based on age in comparison to that reported by Webster et al[2]

Variable	Measure	Total Cohort (< 30 yr)	Patients (20-29 yr)	Patients (< 20 yr)
		Dataset (2018)	Dataset (2018)	Dataset (2018)	Webster et al[2], 2016
Patients	n	91	46	45	316
Age (yr)	mean (SD), range	20.4 (4.7), 13-29	24.0 (2.5), 20-29	16.2 (1.8), 13-19	17.2 (NR), 11-19
Clinical follow-up (mo)	mean (SD), range	59 (26), 25-107	63 (27), 29-107	55 (25), 25-102	60 (NR), 36-120
Males	n (%)	51 (56.0)	29 (63.0)	22 (48.9)	200 (63.6)
Right knee	n (%)	40 (44.0)	25 (54.3)	22 (48.9)	NR
Concurrent meniscal surgery	n (%)	44 (48.4)	18 (39.1.9)	26 (57.8)	NR
ACL re-ruptures	n (%)	6 (6.6)	2 (4.3)	4 (8.9)	57 (18)
ACL re-ruptures	95%CI	95%CI: 1.4%-11.7%	95%CI: 1.6%-10.3%	95%CI: 0.4%-17.3%	95%CI: 17%-29%
Mean time to re-rupture (mo)	mean (SD), range	28 (28), 12-84	55.0 (41.7), 25-84	15 (6), 12-24	21.6 (NR), NR
Repair of re-rupture	n (%)	5 (83.3)	1 (50)	3 (75)	NR
Subsequent surgery to ipsilateral knee	n (%)	14 (15.4)	7 (15.2)	7 (15.6)	NR
Contralateral ACL injury	n (%)	14 (15.4)	9 (19.6)	5 (11.1)	56 (17.7)
Combined ACL injuries	n (%)	20 (22.0)	11 (23.9)	9 (20.0)	113 (35.8)

ACL: Anterior cruciate ligament; SD: Standard deviation; NR: Not recorded; CI: Confidence interval.