ABSTRACT

To analyze the pre and postoperative changes of sagittal spinopelvic parameters in Lenke type 3 and 6 AIS patients.

Thirty-two Lenke 3 and 6 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 27 females and 5 males. Mean age was 14 years, mean follow-up was 37 months. Mean preoperative thoracic kyphosis, lumbar lordosis, pelvic incidence, sacral slope and pelvic tilt were 38.3°±13.9°, 51.9°±9.4°, 49°±8.5°, 34.5°±6.2°, and 14.4°±6.9°, respectively. Mean postoperative thoracic kyphosis, lumbar lordosis, pelvic incidence, sacral slope and pelvic tilt were 26.4°±6.6°, 46.1°±7°, 49.7°±8.5°, 34.1°±5.7°, and 15.5°±6.7°, respectively. Preoperative and last follow-up thoracic kyphosis and lumbar lordosis comparison showed that there is a significant difference, however there is no difference in comparison preoperative and last follow-up pelvic incidence, sacral slope and pelvic tilt.

Lenke type 3 and 6 AIS are double structural curves and fusing the thoracal and lumbar region may change the spinopelvic parameters thus compensatory mechanisms should not be corrupted during the surgery.