Central Register of Controlled Trials (Wiley online: The Cochrane Library)

#1  MeSH descriptor: [Anterior Cruciate Ligament] this term only
#2  MeSH descriptor: [Anterior Cruciate Ligament Reconstruction] this term only
#3  ((anterior near/2 cruciate* near/2 ligament*) or ACL):ti,ab,kw 
#4  #1 or #2 or #3
#5 ((single or double or one or two or "1" or "2") near/2 (incision* or tunnel*)):ti,ab,kw 
#6  rear‐entry or endoscopic or outside‐in or all‐inside or inside‐out:ti,ab,kw 
#7 #5 or #6
#8 #4 and #7

MEDLINE (Ovid online)

1     Anterior Cruciate Ligament/
2     Anterior Cruciate Ligament Reconstruction/
3     ((anterior adj2 cruciate* adj2 ligament*) or ACL).tw.
4     or/1‐3 (13635)
5     ((single or double or one or two or "1" or "2") adj2 (incision* or tunnel*)).tw.
6     (rear‐entry or endoscopic or outside‐in or all‐inside or inside‐out).tw.
7     or/5‐6
8     and/4,7
9     Randomized Controlled Trial.pt.
10   Controlled Clinical Trial.pt.
11   randomized.ab.
12   placebo.ab.
13   Drug Therapy.fs.
14   randomly.ab.
15   trial.ab.
16   groups.ab.
17   or/9‐16
18   exp Animals/ not Humans/
19   17 not 18
20   and/8,19

Lines 9‐19 = Cochrane highly sensitive search strategy for identifying randomised trials (Lefebvre 2011)

/ = MeSH term
Tw = text word (in title, abstract or keywords)
Pt = publication type
Ab = abstract
Fs = floating subheading
Adj = proximity operator