• Yusuke Hori, Masatoshi Hoshino, Kazuhide Inage, Masayuki Miyagi, Shinji Takahashi, Shoichiro Ohyama, Akinobu Suzuki, Tadao Tsujio, Hidetomi Terai, Sho Dohzono, Ryuichi Sasaoka, Hiromitsu Toyoda, Minori Kato, Akira Matsumura, Takashi Namikawa, Masahiko Seki, Kentaro Yamada, Hasibullah Habibi, Hamidullah Salimi, Masaomi Yamashita, Tomonori Yamauchi, Takeo Furuya, Sumihisa Orita, Satoshi Maki, Yasuhiro Shiga, Masahiro Inoue, Gen Inoue, Hisako Fujimaki, Kosuke Murata, Ayumu Kawakubo, Daijiro Kabata, Ayumi Shintani, Seiji Ohtori, Masashi Takaso, and Hiroaki Nakamura.
• Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka, 545-8585, Japan.
• Eur Spine J. 2019 May 1; 28 (5): 914-921.

Study DesignA multicenter cross-sectional study.ObjectivesTo clarify the relationship of trunk muscle mass with low back pain, spinal sagittal balance, and quality of life. Few reports have investigated the relationship of trunk muscle mass with lumbar spine function and spinal balance, and the clinical significance of trunk muscle mass remains unclear.MethodsPatients attending spinal outpatient clinics at 10 different medical institutions were enrolled in this study. Patient demographics, trunk muscle mass and appendicular skeletal muscle mass (ASM) measured by bioelectrical impedance analysis (BIA), body mass index (BMI), Charlson Comorbidity Index (CCI), the Oswestry Disability Index (ODI), visual analog scale (VAS) for low back pain, sagittal vertical axis (SVA), and EuroQol 5 Dimension (EQ5D) score were investigated. Multivariate nonlinear regression analysis was used to investigate the association of trunk muscle mass with the ODI, VAS score, SVA, and EQ5D score.ResultsOf 2551 eligible patients, 1738 (mean age 70.2 ± 11.0 years; 781 men and 957 women) were enrolled. Trunk muscle mass was significantly correlated with the ODI, VAS score, SVA, and EQ5D score (P < 0.001) when adjusted for age, sex, BMI, ASM, CCI, and history of lumbar surgery. Patient deterioration was associated with a decrease in trunk muscle mass, and the deterioration accelerated from approximately 23 kg.ConclusionsTrunk muscle mass was significantly associated with the ODI, VAS score, SVA, and EQ5D score. Trunk muscle mass may assume an important role to elucidate and treat lumbar spinal dysfunction and spinal imbalance. These slides can be retrieved under Electronic Supplementary Material.

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