Koya Kamikawa

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OBJECTIVES The purpose of this study was to clarify the incidence of (CS)-associated osteonecrosis among different underlying diseases and to evaluate the risk factors for steroid-associated osteonecrosis in a prospective MRI study. METHODS We prospectively used MRI to study 337 eligible underlying disease patients requiring CS therapy and succeeded in(More)
STUDY DESIGN A prospectively study. OBJECTIVE Our objective was to clarify the safety and efficacy of asymmetrical pedicle subtraction osteotomy (PSO) in the treatment of severe adult lumbar deformities prospectively. SUMMARY OF BACKGROUND DATA Vertebral wedge osteotomy provides good correction of kyphosis but has rarely been applied to degenerative(More)
STUDY DESIGN A case-control study. OBJECTIVE.: To measure the orientation of the facet joints at both cephalad and caudad portions and to compare them between patients with degenerative spondylolisthesis (DS) and patients with lumbar spinal stenosis (LSS, controls). SUMMARY OF BACKGROUND DATA Several radiologic studies have indicated a correlation between(More)
STUDY DESIGN Case-control study. OBJECTIVE To assess the long-term prevalence of vertebral fractures after lumbar spinal fusion with instrumentation. SUMMARY OF BACKGROUND DATA The incidence of the adjacent and the nonadjacent, remote level subsequent vertebral fractures after lumbar spinal fusion is not well described in the literature. METHODS The(More)
STUDY DESIGN Prospective consecutive series. OBJECTIVE To analyze supine and standing radiographs and the association of back pain using subjective pain criteria. SUMMARY OF BACKGROUND DATA It has been considered that there is little correlation between the degree of collapse of the vertebral body and the level of pain. In previous studies, however,(More)
BACKGROUND The major problem after posterior correction and instrumentation in the treatment of thoracolumbar burst fractures is failure to support the anterior spinal column leading to loss of correction of kyphosis and hardware breakage. We conducted a prospective consecutive series to evaluate the outcome of the management of acute thoracolumbar burst(More)
A new method has been developed for automatic measurement of polyethylene linear modification using three-dimensional CT in total hip arthroplasty (THA) and bipolar hemiarthroplasty (BHP). We obtained a three-dimensional digital image of the metal components by widening the maximum window width, adjusting the proper cutoff threshold level, and removing the(More)
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