ABSTRACT

To analyze the pre and postoperative changes of sagittal spinopelvic parameters in Lenke type 1AIS patients.

Thirty Lenke 1 AIS patients evaluated retrospectively. Thoracic kyphosis, lumbar lordosis, pelvic incidence, sacral slope and pelvic tilt angles were measured on preoperative and last follow-up standing full-length lateral radiographs. Kolmogorov-Smirnov test was utilized to assess distribution of study parameters. Preoperative and postoperative results were compared with Wilcoxen Sum Rank test. p<0.05 considered as statistically significant.

There were 28 females and 2 males. Mean age was 13.4 years, mean follow-up was 38 months. Mean preoperative thoracic kyphosis, lumbar lordosis, pelvic incidence, sacral slope and pelvic tilt were 35.3°±11.9°, 50.8°±7.4°, 48.3°±8.5°, 33.4°±5.6°, and 15.5°±4.5°, respectively. Mean postoperative thoracic kyphosis, lumbar lordosis, pelvic incidence, sacral slope and pelvic tilt were 28.6°±4.6°, 46.3°±7.1°, °7.7±°34.3 ,°7.5±°49.5, and 7°.7±°15.2, respectively. Comparison of the preoperative and last follow-up thoracic kyphosis and lumbar lordosis showed that there is a significant difference statistically. However, there is no statistical difference between preoperative and last follow-up pelvic incidence, sacral slope and pelvic tilt.

Lenke type 1 AIS thoracic structural curve and fusing the thoracic and lumbar region may change the spinopelvic parameters thus compensatory mechanisms should not be corrupted during the surgery.