Spondylolisthesis is the deformity of the spine where the upper segment displaced anteriorly relative to lower segment. Marchetti and Bartolozzi revised the classification system, combined the isthmic and dysplastic type of spondylolisthesis, and used the term of `developmental spondylolisthesis` instead. Dysplastic facet joints, spina bifida at L5 and S1, isthmic spondylolisthesis, elongated pars, severe lumbosacral kyphosis, hypoplastic transverse processes, trapezoidal L5, vertical sacrum, and sacral doming are the possible pathologies.
Especially in patients with back pain in late childhood and adolescent periods a careful physical and neurological examination must be carried out and with the help of radiological methods, slip grade, pars pathologies, sacropelvic balance and condition of neurological structures must be assessed and most suitable treatment must be planned. Although there are many controversies in the surgical treatment, the most suitable approach, fixation method, the necessity of reduction and method of fusion should be determined according to patient`s needs and experience of the surgeon.