A transverse trough was similarly carefully created from the cranial point of the longitudinal trough out to the lateral aspect of the pars against the foraminal level that is slightly caudal to the L4 pedicle. 
A transverse trough was similarly carefully created from the cranial point of the longitudinal trough out to the lateral aspect of the pars against the foraminal level that is slightly caudal to the L4 pedicle .