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Orthopedics | 2011

Lumbar Diskal Cyst Containing Intervertebral Disk Materials

Hiroyuki Tsuchie; Tomio Nishi; Takayuki Tani; Shigeto Maekawa; Yoichi Shimada

The diskal cyst is a relatively new clinical entity and develops clinical symptoms of a unilateral single nerve root lesion. Although many cases of diskal cyst have been reported, the pathogenesis of diskal cyst remains unclear, and several theories regarding the pathogenesis have been proposed. This article presents 2 cases of diskal cyst communicating with an adjacent herniated disk. Magnetic resonance imaging findings showed diskal cysts in the epidural space of the lumbar spine. Surgical resection was performed, and apparent connections between the corresponding disk and cysts were found. Histopathologic examinations of the cyst wall demonstrated cartilaginous tissue including nucleus pulposus and annulus fibrosis. These patients symptoms improved remarkably postoperatively, and there was no recurrence of diskal cyst.The hypothesis supported by many authors is hemorrhage from the epidural venous plexus. Diskal cysts arise first from an underlying intervertebral disk injury that causes an annulus fibrosis fissure in the posterior intervertebral disk. Hemorrhage from the epidural venous plexus with a rich blood flow then occurs in the space between the peridural membrane and vertebral body. However, in our cases, we confirmed that the diskal cyst could have developed from the resorption process of an intervertebral disk herniation. Only 5 cases of diskal cyst demonstrating the presence of cartilaginous tissue in the cyst have been reported. Our 2 cases are rare and support the hypothesis of resorption of intervertebral disk herniation.


Case reports in orthopedics | 2018

Utilizing a Cortical Bone Trajectory Pedicle Screw for Lumbar Flexion-Distraction Injury

Naohisa Miyakoshi; Shigeto Maekawa; Masakazu Urayama; Yoichi Shimada

Spinal flexion-distraction injuries (FDIs) are unstable fractures, commonly located at the thoracolumbar junction. Management of FDIs often necessitates the use of posterior instrumentation and fusion, but long-segment instrumentation surgery decreases postoperative spinal mobility and increases the risk of junctional kyphosis and fracture. We report the case of a patient with FDI showing an L2 vertebral fracture, unilateral L2 pedicle fracture, and disruptions of the posterior ligamentous complex between L1 and L2. After open reduction using L1 and L2 pedicle screws with a conventional trajectory on the right side, a cortical bone trajectory (CBT) pedicle screw was used as an osteosynthesis screw for the fractured left pedicle. This procedure enabled successful single-level fusion. Follow-up radiological examination revealed good reduction and complete bone union. To the best of our knowledge, utilizing a CBT technique as an osteosynthesis screw in FDIs has not previously been described.


Osteoporosis International | 2007

Effect of low-intensity back exercise on quality of life and back extensor strength in patients with osteoporosis: a randomized controlled trial

Michio Hongo; Eiji Itoi; Mehrsheed Sinaki; Naohisa Miyakoshi; Yoichi Shimada; Shigeto Maekawa; Kyoji Okada; Y. Mizutani


Bone | 2008

Intermittent administration of human parathyroid hormone enhances bone formation and union at the site of cancellous bone osteotomy in normal and ovariectomized rats

Koji Nozaka; Naohisa Miyakoshi; Yuji Kasukawa; Shigeto Maekawa; Hideaki Noguchi; Yoichi Shimada


Osteoporosis International | 2007

Back extensor strength and lumbar spinal mobility are predictors of quality of life in patients with postmenopausal osteoporosis

Naohisa Miyakoshi; Michio Hongo; Shigeto Maekawa; Yoshinori Ishikawa; Yoichi Shimada; Eiji Itoi


Journal of Bone and Mineral Metabolism | 2015

Healing of bisphosphonate-associated atypical femoral fractures in patients with osteoporosis: a comparison between treatment with and without teriparatide.

Naohisa Miyakoshi; Toshiaki Aizawa; Satoshi Sasaki; Shigeru Ando; Shigeto Maekawa; Hiroshi Aonuma; Hiroyuki Tsuchie; Hiroshi Sasaki; Yuji Kasukawa; Yoichi Shimada


Osteoporosis International | 2005

Factors related to spinal mobility in patients with postmenopausal osteoporosis

Naohisa Miyakoshi; Michio Hongo; Shigeto Maekawa; Yoshinori Ishikawa; Yoichi Shimada; Kyoji Okada; Eiji Itoi


Journal of Bone and Mineral Metabolism | 2010

Effects of combination treatment with alendronate and vitamin K2 on bone mineral density and strength in ovariectomized mice

Hiroshi Sasaki; Naohisa Miyakoshi; Yuji Kasukawa; Shigeto Maekawa; Hideaki Noguchi; Keji Kamo; Yoichi Shimada


Tohoku Journal of Experimental Medicine | 2007

The Selective Cyclooxygenase-2 Inhibitor Celecoxib Reduces Bone Resorption, but not Bone Formation, in Ovariectomized Mice in Vivo

Yuji Kasukawa; Naohisa Miyakoshi; Apurva K. Srivastava; Koji Nozaka; Shigeto Maekawa; David J. Baylink; Subburaman Mohan; Eiji Itoi


Biomedical Research-tokyo | 2010

Effects of alfacalcidol on muscle strength, muscle fatigue, and bone mineral density in normal and ovariectomized rats

Yuji Kasukawa; Naohisa Miyakoshi; Shigeto Maekawa; Koji Nozaka; Hideaki Noguchi; Yoichi Shimada

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Yoichi Shimada

Akita Prefectural University

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