Department of Orthopedic Surgery;
Akita University Graduate School of Medicine;
Akita;
Japan;
Department of Orthopedic Surgery;
Kakunodate General Hospital;
Senboku;
Japan;
Radiology Division;
Kakunodate General Hospital;
Senboku;
Japan;
Independent Administrative Institution;
Akita Prefectural Development and Disability Organization;
Akita;
Japan;
Proton Density Fat Fraction; Vertebral Body; Bone Marrow; Para-Spinal Muscle; Age; Bone Mineral Density;