 There was a significant laterolisthesis at L4-L5 and due to the fact that there were no facet complexes at L5-S1 and L4-L5 on the right side as well as there was a significant concavity on the right L4-L5 disk space which was demonstrated from intraoperative x-rays and compared to preoperative x-rays, it was decided from an instrumentation. 
There was a significant laterolisthesis at L4 - L5 and due to the fact that there were no facet complexes at L5 - S1 and L4 - L5 on the right side as well as there was a significant concavity on the right L4 - L5 disk space which was demonstrated from intraoperative x - rays and compared to preoperative x - rays , it was decided from an instrumentation .