Sequential Correction Using Satellite Rod for the Treatment of Severe Rigid Spinal Deformity: A Retrospective Study of 19 Cases

Abstract

Objective: The aim of this study was to access the efficacy of sequential correction using satellite rod in patients with severe rigid spinal deformity undergoing posterior-only PVCR.Methods: 19 patients with severe rigid spinal deformity who underwent PVCR at our center from January 2014 to December 2019 were reviewed. Radiographic measurements, including major coronal Cobb angle, kyphotic curve angle, coronal and sagittal balance were measured. Clinical outcomes, including Oswestry Disability Index score, SRS-22 questionnaire, and complications were recorded.Results: Total 19 patients were followed at least 2 years. The mean coronal Cobb angle was decreased from 122.7° ± 13.17° to 57.89° ± 8.65° postoperatively, and to 58.42° ± 8.98° at final follow-up. Correction rate is 52.8%. The kyphotic curve angle improved from 102.2° ± 17.05° preoperatively to 39.68° ± 13.67° postoperatively, and to 37.74° ± 12.14° at final follow-up. Correction rate is 61.2%. The apex vertebral translation, ODI and SRS-22 scores were improved significantly at the final follow-up compared with preoperative.Conclusions: Sequential correction with auxiliary satellite rod can effectively reduce the surgical difficulty and achieve a well deformity correction rate for patients with severe rigid spinal deformity.