Lumbar Spinal Stenosis is the most prevalent disease in patients above 65-years- old affecting the lumbar spine. It is a condition leading to a tight vertebral canal. Surgery is the definitive treatment, although with high failure levels. We are studding a new technique for surgical treatment, in which, the pedicle structure is lost in terms of fixation. To regain the stability, it becomes necessary the use of pedicle screws (PS). However, it is unknown how the PS will have their fixation strength without the pedicle. We studied 5 types of PS inserted into a cylinder with two portions, representing the pedicle and vertebral body and perform a pullout with 500 N. Our end results were the stress and the strain, at the bone-screw interfaces, comparing the intact with subtraction of the pedicle model. The result showed that, in general, the 5 screws had a loss of 47% in fixation in terms of displacement. Many PS obtained a lower stress when the pedicle was subtracted, a fact that was explained being the trabecular bone more deformable (lower elastic modulus) and likely to generate lower stress for the same displacement. In the end, this study was succeeded to report the removal of the vertebral pedicles, brings a large fault capacity, shown by an average increase of almost 50% in the PS displacement, when a load of 500 N is applied in the form of pullout.