Anterior correction of idiopathic scoliosis using the KASS-Dual rod system / 中国矫形外科杂志

ABSTRACT

[ Objective] To analyze the clinical results of scoliosis patients treated by anterior correction surgery using the KASS (Kaneda Anterior Scoliosis System the dual rod system). [ Method] Total 123 idiopathic scoliosis patients were treated. The patients' curve patterns by King classification were as followsThoracic scoliosis [ type Ⅱ (n = 13), Ⅲ (n = 18 ) , and Ⅳ (n = 16) ,total (n =47) and thoracolumbar or lumbar (TL/L) curve (n = 76)]. In all patients, anterior correction surgery within the range of the major curve was performed. The average follow-up period was 7 years 7 months (2 ～ 13 years 6 months).[ Result] Fusion was attained in all patients. Correction rates of the major curve scoliosis were 68% in thoracic scoliosis and 81%in TL/L scoliosis. In sagittal alignment, all patients restored nearly physiologic thoracic kyphosis and lumbar lordosis. Correction rates of horizontal tilt of the lowermost end vertebra were 78% in thoracic scoliosis and 83% in TL/L scoliosis. Correction rates of the apical vertebral rotation were 59% in thoracic scoliosis and 70% in TL/L scoliosis. No neurovascular and implant related complications were observed. [ Conclusion ] KASS allows excellent 3-D correction of the scoliosis and rigid enough stability to maintain the correction with a shorter fusion.