Decreased muscle mass and strength affected spinal sagittal malalignment. - Miyagi M; Inoue G; Hori Y; Inage K; Murata K; Kawakubo A; Fujimaki H; Koyama T; Yokozeki Y; Mimura Y; Takahashi S; Ohyama S; et al. (European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2022)