Occipitosacral Fusion for Multiple Vertebral Fractures with Kyphotic Deformity in a Patient with Mutilating Rheumatoid Arthritis: A Case Report oleh Tetsu Tanouchi, Takachika Shimizu, Masatake Ino, Naofumi Toda, Nodoka Manabe, Kanako Itoh, Keisuke Fueki