Abstract
Purpose
compare the radiological results in sagittal balance correction obtained with pedicle subtraction osteotomy (PSO) versus anterior-posterior osteotomy (APO) by double approach in adults.
Material and Methods
between January of 2001 and July of 2009, fifty-eight vertebral osteotomies were carried out in fifty-six patients: 9 Smith-Petersen osteotomy (SPO), one vertebral resection osteotomy (VRO), 30 anterior-posterior osteotomies (APO) and 18 pedicle subtraction osteotomies (PSO), being the lasts two groups the sample studied (48 osteotomies). The mean age of the patients was 56.3 years (17–72). Initial diagnose was: 28 posttraumathic kyphosis, 7 postsurgical kyphosis, 7 adult degenerative disease, 4 ankylosing spondylitis and 2 congenital kyphoscoliosis. We evaluated the preoperative standing radiographs, the postoperative and at final follow-up by digital measurements with iPACS system viewer (© Real Time Image, USA, 2001). The mean follow-up was 54 months (6–98), and complications were analized.
Results
The group APO had a mean preoperative thoracic kyphosis of 67 °, a mean lumbar lordosis of −42° and a mean sagital balance of 8.6°. The group PSO had a mean preoperative thoracic kyphosis of 41°, a mean lumbar lordosis of −22° and a mean sagital balance of 12.3°. The mean correction in the APO group was 29° in its thoracic kyphosis, 8° of lumbar lordosis and 6.5° in its sagital balance. The mean correction in the PSO group was 12° of the thoracic kyphosis, 25 in the lumbar lordosis and 8.4 cm in the sagital balance. The local correction obtained at the osteotomy level was 28° in the APO group and 25.3° in the PSO group. There were no statistically significant differences in the percentage of correction between both groups (p>0.05). In terms of complications, PSO group had lower complication rate (26.6%) comparing to ODV group (44.5%).
Conclusions
APO and PSO are useful techniques to correct the global sagital balance in patients with a disturbance of the sagittal profile. The correction obtained with the PSO is similar to obtained with the APO. Patients undergoing an OSP had a lower complication rate than patients undergoing APO.
