 I tried various sized spacers, and at this point, we exposed the L5 body and took a dowel from the body and filled the hole with a 15 x 20-mm Chronos VerteFill tricalcium phosphate plug. 
I tried various sized spacers , and at this point , we exposed the L5 body and took a dowel from the body and filled the hole with a 15 x 20 - mm Chronos VerteFill tricalcium phosphate plug .