Study	Reason for exclusion
Johnstone 2006	This is a randomised controlled trial but does not compare the intervention of interest. This trial compares bone graft A with bone graft B and artifical bone.
Kesteris 2006	This is a randomised controlled trial but does not compare the intervention of interest. This trial compares bone graft A with bone graft B with additional drug.
Munro 2007	This is a randomised controlled trial but does not compare the intervention of interest. This trial compares bone graft A with bone graft B and artifical bone.
Timperley 2006a	This was a randomised controlled trial. Personal communication with the first author (Autumn 2008) discovered that the trial was stopped as it became mandatory for the trialists to wash the bone graft. Therefore the randomisation in this trial between washed and unwashed allograft was no longer a viable option. No published report about this trial has been identified.
Timperley 2006b	This is a randomised controlled trial but does not compare the intervention of interest. This trial compares bone graft A with bone graft B and artifical bone.
Timperley 2007	This is a randomised controlled trial but does not compare the intervention of interest. This trial compares bone graft A with bone graft B and artifical bone.