Treatment of patients with posttraumatic deformities of the thoracolumbar spine using Schwab 5 osteotomy through combined and posterior approaches

Abstract

Objective. To analyze the results of surgical treatment of patients with rigid posttraumatic deformities of the thoracolumbar spine operated on using Schwab 5 osteotomy through combined and posterior approaches. Material and Methods. A retrospective cohort study was conducted. Study group included 60 patients (m/f = 25/35). Median age was 48 (26–58) years, median time since injury was 11 (9–14) months, and minimum follow-up period was 2 years. A two-stage intervention with resection of the vertebral body, correction of the deformity, and placement of an interbody implant through the anterior approach followed by final fixation through the posterior approach (VCR a+p group) was performed in 29 cases. Vertebral body resection through the posterior approach with correction of the deformity, installation of an interbody implant, and rigid transpedicular fixation (VCRp group) was performed in 31 cases. In all patients, the magnitude of correction was assessed, as well as the following parameters: frontal balance, sagittal balance, thoracic kyphosis, lumbar lordosis, pelvic incidence, sacral slope and pelvic tilt. The results of treatment were evaluated in dynamics by the level of pain syndrome (VAS) and quality of life (ODI), as well as based on the analysis of postoperative complications. Results. The groups were comparable in terms of gender, age, magnitude of the kyphotic component of the deformity, level of pain syndrome and degree of initial neurological deficit (p > 0.05). Correction of the deformity kyphotic component was significantly better in patients in the VCR p group compared to those in the VCRa+p group (p = 0.036). Both groups showed a significant decrease in the level of pain syndrome 3 months after surgery. However, further follow-up showed a tendency for back pain to increase on average one year after surgery in the VCRa+p group. A total of 67 complications were revealed in 40 (66.7 %) patients. Herewith, in the early postoperative period there were 55 complications in 31 patients, and in the late period there were 12 complications in 9 patients. Analysis of early complications showed a higher incidence of anemia (p = 0.002) and liquorrhea (p = 0.017) in the VCRp group compared to those in the VCRa+p group. The incidence of long-term complications did not differ significantly between groups (p = 0.866). An increase in back pain in the long-term period was observed in 12 (41.4 %) patients of the VCR a+p group and in 4 (12.9 %) patients of the VCR p group. Analysis of risk factors for this condition showed a tendency for back pain to increase in the long-term period in patients with residual local deformity against the background of low pelvic index values. Conclusion. Correction of the kyphotic component of deformity was significantly better in patients of the VCR p group, which was accompanied by greater surgical trauma and incidence of early postoperative complications. The tendency of patients’ quality of life to deteriorate in the long-term follow-up period seems to be related to the occurrence of pain syndrome in the lumbar spine in patients with residual kyphotic deformity against the background of initially low compensatory capabilities.

Keywords

• post-traumatic deformity
• surgical correction
• long-term results