Table 1

 Search strategy for the study

This strategy was used to search Medline. The strategy was modified for searches of other databases.
1 epidemiologic studies/
2 exp case control studies/
3 exp cohort studies/
4 exp prospective studies/
5 exp “outcomes (health care)”/
6 exp outcome assessment/
7 exp prognosis/
8 exp risk factors/
9 exp Follow-Up Studies/
10 exp Epidemiological Research/
11 odds ratio/
12 natural history.tw.
13 time factors/
14 exp clinical trials/
15 recurrence/
16 incidence/
17 (case and control).tw.
18 risk$.tw.
19 etiol$.tw.
20 aetiol$.tw.
21 odds ratio$.tw.
22 (causation or causal$).tw.
23 cohort$.tw.
24 (observational adj (study or studies)).tw.
25 longitudinal.tw.
26 prognos$.tw.
27 outcome$.tw.
28 predict$.tw.
29 course$.tw.
30 retrospective.tw.
31 or/1–30
32 (talocrural or talo-crural or talocalcaneal or talo-calcaneal or talofibular or talo-fibular).tw.
33 inversion.tw.
34 supination.tw.
35 ankle$.tw.
36 or/32–35
37 exp joint instability/
38 sprain$.tw.
39 injur$.tw.
40 exp “Sprains and Strains”/ and “strains”/
41 or/37–40
42 36 and 41
43 exp ankle injuries/
44 42 or 43
45 31 and 44