Objective: The aim of this study to present the results of surgical outcome of the patients who were operated with transpedicular posterior screw fixation and posterolateral fusion for lumbar spondylolysthesis.

Methods: In this study, we evaluated 32 patients who were treated for lomber spondylolisthesis between 1996 and 2004 in our hospital, retrospectively. All patients have been evaluated with preoperative dynamic lomber x-rays, computed tomography and magnetic resonance imaging. Posterior decompression, posterior transpedicular screw placement and posterolateral fusion have been pelformed in all patients. The stabilization systems were evaluated with lomber x-ray and computed tomography, were obtained on the first postoperative day in all patients. Lomber x-rays were repeated at the Ist. 3rd. and 6th. months for evaluating the fusion.

Results: Lower back and leg pain and neurological deficits in variable degrees, were present in all patients with improved lumbar spinal instability according to clinical and radiological data. The patients consisted of 29 females and 3 males, ranging in age from 22 to 70 years with a mean of 52.6 years. The level of spondylolystesis was at the L5-S1 in 19 patients, L4- L5 in 11 and L3-L4 in 2 patients. Spondylolystesis degrees according to Meyerding scale were grade 1 in 19 patients and grade 2 in 13 patients. Lower back pain improved in all patients. No further operation was required in any of the patients.

Conclusion: Posterior transpedicular screw fixation and posterolateral fusion should be preferred in treatment of lomber spondylolysthesis.