Table 1.

Systematic search strategies and keywords.

Database	Search	Keywords
Pubmed	1	(risk) OR risk of
	2	(injury OR injuries OR tear OR tears OR tearing OR rupture OR rupture OR sprain OR sprains)
	3	(anterior cruciate ligament or ACL)
	4	(((((prospective) OR randomized controlled trial) OR cohort) OR Case control) OR case-control) OR longitudinal
	5	#1 AND #2 AND #3 AND #4
	6	reconstruction
	7	#5 NOT #6
	8	(animals) NOT (animals AND humans)
	9	#7 NOT #8
	10	((editorial) OR letter) OR comment)
	11	#9 NOT #10
	12	#9 NOT #10: Filters: English
Cochrane	1	(risk) OR risk of
	2	MeSH descriptor: [Anterior Cruciate Ligament] explode all trees
	3	anterior cruciate ligament OR ACL (word variations have been searched)
	4	#2 or #3
	5	MeSH descriptor: [Wounds and Injuries] explode all trees
	6	injuries OR injury OR tear OR tears OR tearing OR rupture OR ruptures OR sprain OR sprains (word variations have been searched)
	7	#5 or #6
	8	prospective OR randomized controlled trial OR cohort OR case control OR case-control (word variations have been searched)
	10	animals NOT (animals AND humans)
	11	editorial OR letter OR comment
	12	#1 AND #4 AND #7 AND #8 NOT #10 NOT #11