The relationship between spinal coronal malalignment/imbalance and muscle mass in patients with adolescent idiopathic scoliosis

• Published in: Journal of Spine Research Vol. 15; no. 11; pp. 1328 - 1334
• Main Authors: Miyagi, Masayuki, Ikeda, Shinsuke, Yokozeki, Yuji, Imura, Takayuki, Mimura, Yusuke, Takaso, Masashi, Tanaka, Yoshihide, Saito, Wataru, Nakazawa, Toshiyuki, Inoue, Gen, Shirasawa, Eiki
• Format: Journal Article
• Language: Japanese
• Published: The Japanese Society for Spine Surgery and Related Research 20.11.2024; 一般社団法人 日本脊椎脊髄病学会
• Subjects: Adolescent idiopathic scoliosis; Cobb angle; Cobb角; Trunk muscle mass; 体幹筋肉量; 特発性脊柱側弯症
• ISSN: 1884-7137; 2435-1563
• DOI: 10.34371/jspineres.2024-1113

Introduction: In the current study, focusing on the difference between trunk muscle and appendicular skeletal muscle, the relationships between spinal coronal alignment and muscle mass including trunk muscle mass and appendicular skeletal muscle mass were elucidated.Methods: 196 AIS girl patients whose bone maturation we considered complete were included. Body composition including appendicular skeletal or trunk muscle mass corrected by the square of height were measured using bioelectrical impedance analysis. Further, Cobb angle and several spinal coronal alignment parameters including L4 Tilt, C7-Central sacrum vertical line (CSVL), and radiographic shoulder height (RSH) were also measured. Then we evaluated correlations among these measurements using Spearman's correlation coefficient. Additionally, we defined L4Tilt≥10 degrees and/or C7-CSVL≥20 mm and or RSH≥15 mm as spinal coronal malalignment and divided into normal alignment group and coronal malalignment group. Measurements were compared between 2 groups and associated factors of spinal coronal malalignment were evaluated by multiple logistic regression analysis.Results: There were significant positive correlations between Cobb angle and RSH, age and corrected appendicular skeletal muscle. By contrast, age was negatively correlated with corrected trunk muscle. Further, higher Cobb angle and lower trunk muscle mass in coronal malalignment group were observed compared with those in normal group. In addition, Cobb angle as well as corrected trunk muscle mass were significantly associated with spinal coronal malalignment in multiple logistic regression analysis.Conclusions: These findings indicated that higher Cobb angle and lower trunk muscle mass might be associated with spinal coronal malalignment in AIS patients.