Restoration of Lumbar Lordosis in Flat Back Deformity: Optimal Degree of Correction

摘要

Study Design A retrospective comparative study. Purpose To provide an ideal correction angle of lumbar lordosis (LL) in degenerative flat back deformity. Overview of Literature The degree of correction in degenerative flat back in relation to pelvic incidence (PI) remains controversial. Methods Forty-nine patients with flat back deformity who underwent corrective surgery were enrolled. Posterior-anterior-posterior sequential operation was performed. Mean age and mean follow-up period was 65.6 years and 24.2 months, respectively. We divided the patients into two groups based on immediate postoperative radiographs-optimal correction (OC) group (PI-9°≤LL Results Patients in OC group had significantly less correction loss and maintained normal sagittal alignment (sagittal vertical axis Conclusions In flat back deformity, correction of LL to within 9° of PI will result in better sagittal balance. Thus, we recommend sufficient LL to prevent correction loss, especially in patients with high PI.