MATERIAL and METHODS: Hospital records, preoperative and postoperative graphs and MRI of 50 patients who were diagnosed as grade 1 and 2 spondylolisthesis and treated surgically in our department between 2004 and 2008 were examined retrospectively. Degree of slippage was evaluated according to Meyerding, lumbar lordosis angle was measured using the Cobb method and sacral inclination was evaluated by measuring the angle between the posterior border of S1 and perpendicular line.

RESULTS: Of the 50 spondylolisthesis patients 41 were women and 9 were men with a mean age was 58.46. Lumbar lordosis, four-to-floor and sacral inclination angles were measured and the differences between preoperative and postoperative values were not statistically significant. Following surgery, 26 of the 42 grade 1 patients and 7 of the 8 grade 2 patients had reduction of the angles in their postoperative graphs.

CONCLUSION: For the surgical treatment of spondylolisthesis, transpedicular screw-rod system and posterolateral fusion provides reduction for grade 1 and 2 patients without a special maneuver and does not change the sagittal balance. Anahtar Kelimeler : Lumbar lordosis, Sagittal balance, Sacral inclination, Spondylolisthesis