Haruka Shimoda

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Here we investigated the biomechanical properties of spinal segments in patients with degenerative lumbar spondylolisthesis (DLS) using a novel intraoperative measurement system. The measurement system comprised spinous process holders, a motion generator, a load cell, an optical displacement transducer, and a computer. Cyclic displacement of the holders(More)
Patients with cervical compression myelopathy were studied to elucidate the mechanism underlying boomerang deformity, which results from the migration of the cervical spinal cord between split laminae after laminoplasty with median splitting of the spinous processes (boomerang sign). Thirty-nine cases, comprising 25 patients with cervical spondylotic(More)
OBJECT In vivo quantitative measurement of lumbar segmental stability has not been established. The authors developed a new measurement system to determine intraoperative lumbar stability. The objective of this study was to clarify the biomechanical properties of degenerative lumbar segments by using the new method. METHODS Twenty-two patients with a(More)
STUDY DESIGN A clinicobiomechanical study. OBJECTIVE To clarify the clinicobiomechanical characteristics of a segment with lumbar degenerative spondylolisthesis (LDS) using an original intraoperative measurement system. SUMMARY OF BACKGROUND DATA Although radiographical evaluation of LDS is extensively performed, the diagnosis of segmental instability(More)
We examined the reliability of radiological findings in predicting segmental instability in 112 patients (56 men, 56 women) with a mean age of 66.5 years (27 to 84) who had degenerative disease of the lumbar spine. They underwent intra-operative biomechanical evaluation using a new measurement system. Biomechanical instability was defined as a segment with(More)
To elucidate the normative values of whole body sagittal alignment and balance of a healthy population in the standing position; and to clarify the relationship among the alignment, balance, health-related quality of life (HRQOL), and age. Healthy Japanese adult volunteers [n = 126, mean age 39.4 years (20–69), M/F = 30/96] with no history of spinal disease(More)
OBJECT The objective of this study was, using a novel intraoperative measurement (IOM) system, to test the hypothesis that an increased facet joint volume is evidence of spinal instability. METHODS In 29 patients (male/female ratio 13:16; mean age 67.5 years, range 43-80 years)-17 with degenerative spondylolisthesis (DS) of the lumbar spine (Group DS) and(More)
STUDY DESIGN Retrospective clinical study. OBJECTIVE To evaluate clinical results of patients with nontraumatic cervical lesions treated by cervical pedicle screw (PS) fixation and to discuss the surgical indications. SUMMARY OF BACKGROUND DATA PS fixation provides an outstanding stability for cervical lesions with instability. This technique, however,(More)
Purpose Normal spinal alignment in standing position can be precisely measured by using EOS imaging which also allows 3-D simulation of the spine. Although sagittal alignment of the spine has been investigated using a conventional x-ray, the data is yet sparse. The purpose of this study is to clarify the alignment of the spine in normal Japanese population(More)
A relationship between spinal deformity and ambulation is yet to be clarified. We hypothesized that undesirable spino-pelvic alignment affects walking ability. The purpose of present study is to clarify an influence of spino-pelvic alignments on walking ability. Consecutive patients who visited our institution between October 2011 to September 2012 were(More)