Correlation between sagittal spinal and pelvic parameters in degenerative lumbar scoliosis / 中华骨科杂志

ABSTRACT

Objective To investigate the correlation between sagittal spinal and pelvic parameters in different types of degenerative lumbar scoliosis (DLS).Methods Standing anteroposterior and lateral radiographs of the whole spine including hip joints were carried out in 70 volunteers without spinal deformity and 110 patients with DLS.The following parameters were measuredthoracic kyphosis (TK),thoracolumbar kyphosis (TL),lumbar lordosis (LL),sagittal vertical axis (SVA),pelvic incidence (PI),pelvic tilt (PT) and sacral slope (SS).According to the sagittal spinal alignment,the patients with DLS were classified into 3 typestype Ⅰ (45 cases),type Ⅱ (48 cases) and type Ⅲ (17 cases).The sagittal spinal and pelvic parameters were compared between control group and different types of DLS group,and the relationship between the sagittal spinal parameters and pelvic parameters in different groups were also investigated.Results PI in type Ⅲ patients was lower than those in other groups; PT in type Ⅱ and Ⅲ patients was higher than those in controls and type Ⅰ patients,and there was a significant difference between type Ⅱ and Ⅲ patients; SS in type Ⅱ and Ⅲ patients was lower than those in controls and type Ⅰ patients,and there was no significant difference between type Ⅱ and Ⅲ patients.Sagittal spinal imbalance was found in 17.8％ of type Ⅱ patients and 29.4％ of type Ⅲ patients.There were significant correlations in sagittal spinal parameters,pelvic parameters and spinopelvic parameters in controls and type Ⅰ patients.However,in type Ⅱ and Ⅲ patients,the correlations in sagittal spinal parameters and spinopelvic parameters decreased,even disappeared,though significant correlations were still found in pelvic parameters.In any group,SVA showed a significant correlation with LL and PT,especially with PT.Conclusion The sagittal spinal alignment has a ladder-like change in patients with DLS,and the correlations in pelvic parameters and spinopelvic parameters also change in type Ⅱ and Ⅲ patients,for whom the sagittal spinal imbalance is more likely to occur.