Masao Tomioka

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OBJECT Cervical pedicle screw (PS) misplacement leads to injury of the spinal cord, nerve root, and vertebral artery. Recently, several investigators reported on the usefulness of a spinal navigation system that improves the accuracy of PS insertion. In this study, the authors assessed the accuracy of cervical pedicle, lateral mass, and odontoid screw(More)
Correct screw placement is especially difficult in the upper thoracic vertebrae. At the cervicothoracic junction (C7-T2), problems can arise because of the narrowness of the pedicle and the difficulty of using a lateral image intensifier there. Other upper thoracic vertebrae (T3-6) pose a problem for screw insertion also because of the narrower pedicle. We(More)
We previously reported that lower extremity muscular strength of older adults did not predict success of a balance recovery task. We propose that lower extremity coordination may limit performance independently of lower extremity strength. The present study was conducted to determine the extent to which knee extension strength and hip–knee coordination(More)
Neurologic deficit secondary to a Jefferson fracture is rare, as the fracture fragments tend to spread outward. To the authors' knowledge, only five cases of vertebral artery injury associated with C1 fracture have been reported. A 75-year-old man with diffuse spinal hyperostosis hit the top of his head and sustained a Jefferson fracture. The patient(More)
STUDY DESIGN Consecutive cohort study. OBJECTIVE To reconsider effects of the Second National Acute Spinal Cord Injury Study. SUMMARY OF BACKGROUND DATA High dose methylprednisolone sodium succinate (MPSS) for the patients with acute spinal cord injury has been considered standard treatment in the several countries. However, many authors have criticized(More)
STUDY DESIGN Case report and clinical discussion. OBJECTIVE To describe technical pitfall to treat 2 cervical cord injuries, including dislocations in patients with ankylosed spine due to diffuse idiopathic skeletal hyperostosis (DISH) or ossification of the posterior longitudinal ligament (OPLL). SUMMARY OF BACKGROUND DATA DISH and OPLL are disease(More)
Cervical pedicle screws, when misplaced, tend to perforate laterally. One of the reasons for lateral perforation is vertebral rotation during screw insertion. However, actual vertebral rotation during pedicle screw insertion is unknown. In this study, we measured vertebral rotation during pedicle screw insertion in patients with cervical injury. We inserted(More)
BACKGROUND Deep venous thrombosis (DVT) and pulmonary thromboembolism are major complications in patients with acute spinal cord injury. The incidence of DVT in patients with a spinal cord injury has ranged from 5% to 26% in several countries; however, the incidence in Japan is unknown. METHODS We retrospectively assessed 52 patients with acute cervical(More)