What is the difference in pedicle morphology of the fifth lumbar vertebra between isthmic and degenerative L5–S1 spondylolisthesis? An anatomic study of 328 patients via multi-slice spiral computed tomography

The purpose of this study was to investigate and determine whether there are differences in L5 pedicles morphology between isthmic degenerative L5–S1 spondylolisthesis. One hundred nineteen patients with spondylolisthesis 45 at were enrolled the IS group DS group, respectively, 164 lumbar disc herniation without spondylolysis or classified into normal (NL) group. A series pedicle parameters fifth vertebra, including length (PL), width (PW), screw trajectory (PSTL), height (PH), camber angle (PCA), measured using multi-slice spiral computed tomography (MSCT). slip distance vertebra on radiography, percentage also recorded. shorter wider, PCA larger compared NL On contrary, elongated thinner, smaller. PL significantly positively correlated but PW negatively slip. There no correlation shows abduction, shortness, width, while that adduction, lengthening, thinning populations. changes may be result stress remodelling development spondylolisthesis, which should taken consideration when placing insertion screws.