Correction of Lenke1 adolescent idiopathic scoliosis using pedicle screws:the relationship between correction results and implant density
YANG Chang-wei
ZHAO Yun-fei
ZHU Xiao-dong
LI Ming
Abstract：Objective To evaluate effects of implant density on coronal and sagittal correction in the treatment of Lenke1 adolescent idiopathic scoliosis ( AIS ).Methods Thirty-one consecutive patients with Lenke1 AIS underwent single-stage posterior correction and instrumented spinal fusion with pedicle screw ifxation between January 2008 and January 2010. The data were retrospective analyzed. The radiographs were analyzed before surgery, immediately after surgery, and at the 2-year follow-up. General information of patients was recorded. Pearson correlation analysis was used to analyze the correlation between implant density, coronal Cobb’s angle correction, and correction index ( postoperative correction / preoperative curve lfexibility ). The relations between implant density and magnitude of coronal and sagittal curve correction were also investigated. According to the implant density, patients were divided into two groups: high-density group ( >0.7 ) and low-density group (≤0.7 ). The differences were compared between the related parameters in the two groups.Results The mean patient age at the time of operation was 15.3 years. The mean preoperative main thoracic curve of ( 48.5±8.5 ) ° was corrected to ( 16.0±6.9 ) ° ( 68% correction ) 2 weeks postoperatively. There was no signiifcant correlations between implant density and curve correction (r=?0.19, P=0.315 ). No correlations were detected between implant density and correction index (r=?0.10,P=0.589 ), between implant density and correction loss (r=?0.04, P=0.837 ), and there were also no correlations between implant density and magnitude of sagittal thoracic kyphosis change (r=0.09,P=0.619 ). The average implant density of the high and low groups were 0.85 and 0.61 respectively (P<0.01 ). No obvious differences were found in parameters of the two groups.Conclusions Taking curve lfexibility into consideration or not, implant density is not correlated with coronal Cobb’s curve correction of main thoracic curve. No signiifcant correlations are found between screw density and correction index. There are no associations between implant density and magnitude of sagittal thoracic kyphosis change before and after surgery.
Keywords：ScoliosisAdolescentOrthopedic proceduresBone screwsScrew density
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 771-774 )