Table 2.

Reasons for exclusion of studies.

Study	Reason for study exclusion
Tropp et al. 1985	Ankle discs, orthoses used
Caraffa et al. 1996	Balance boards used
Bahr et al. 1997	Balance boards used
Hewett et al. 1999	Wobble boards used
Wedderkopp et al. 1999	Ankle discs used
Heidt et al. 2000	Treadmill sessions implemented
Söderman et al. 2000	Wobble boards used
Junge et al. 2002	Not detailed enough for replication
Kaminski et al. 2003	Injury prevention not the primary outcome
Stasinopoulos et al. 2004	Orthoses, balance boards used
Verhagen et al. 2004	Wobble boards used
Olsen et al. 2005	Wobble boards used
Garrick et al. 2005	Wobble boards used
Peterson et al. 2005	Balance boards used
Verhagen et al. 2005	Injury prevention not the primary outcome
McKuine et al. 2006	Wobble boards used
Mykleburst et al. 2007	Lack of control group, mats and balance boards used
Mohammadi et al. 2007	Orthoses, ankle weights, resistance bands, wobble boards used
McHugh et al. 2007	Foam stability pad used
Emery et al. 2007	Wobble boards used
Pasanen et al. 2008	Wobble boards used
Hupperets et al. 2008	Wobble boards used
Steffen et al. 2008	Injury prevention not the primary outcome
Hupperets et al. 2009	Balance boards used
Kraemer et al. 2009	Balance boards used
Lim et al. 2009	Injury prevention not the primary outcome
Eils et al. 2010	Wobble boards used
Eisen et al. 2010	Injury prevention not the primary outcome
Emery et al. 2010	Wobble boards used
Parkkari et al. 2011	Sticks used as part of a training approach