Michael F. Stoffel

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STUDY DESIGN Single-center prospective randomized controlled study. OBJECTIVE To evaluate the accuracy of robot-assisted (RO) implantation of lumbar/sacral pedicle screws in comparison with the freehand (FH) conventional technique. SUMMARY OF BACKGROUND DATA SpineAssist is a miniature robot for the implantation of thoracic, lumbar, and sacral pedicle(More)
The objective of the article is to verify the hypothesis that the dorsal multilevel laminectomy and rod-screw-instrumented fusion (DLF) for multilevel spondylotic cervical myelopathy (MSCM) is less strenuous for patients, and less prone to perioperative complications, than ventral multilevel corpectomy and plate-screw-instrumented fusion (VCF), while(More)
OBJECTIVE To present the rare case of a displaced odontoid fracture after manipulative treatment. CLINICAL FEATURES A 37-year-old, 15-week pregnant patient was referred with acute neck pain and a diffuse paravertebral swelling that started after cervical manipulation performed by her general medical practitioner 5 days before. Because of pregnancy, a(More)
OBJECTIVE This study assessed the feasibility and safety of percutaneous posterior pedicle screw fixation for instabilities of the thoracic and lumbar spine, using standard instruments designed for the open approach and fluoroscopy. METHODS All patients who underwent percutaneous posterior pedicle screw fixation of the thoracic and lumbar spine were(More)
BACKGROUND To provide a score to predict the risk of early mortality after single craniocerebral gunshot wound (GSW) based on three clinical parameters. METHODS All patients admitted to Baragwanath Hospital, Johannesburg, South Africa, between October 2000 and May 2005 for an isolated single craniocerebral GSW were retrospectively evaluated for the(More)
We have investigated the role of nitric oxide (NO) as mediator of the secondary growth of a traumatic cortical necrosis. For this purpose, a highly standardized focal lesion of the brain was induced in 46 Sprague-Dawley rats by cold injury. Twenty-four hours later--the timepoint of maximal lesion spread--the animals were sacrificed and brains were removed(More)
Lumbar spinal stenosis is a degenerative disease of the elderly population. Although microsurgical decompression has shown good long-term results, percutaneous techniques could provide an alternative in the presence of significant comorbidities. Eighty-seven interspinous process decompression devices (In-space; Synthes, Umkirch, Germany) were implanted(More)
OBJECT Symptomatic overdrainage in children with shunt-treated hydrocephalus represents one of the more difficult shunt-related diseases and may require repeated surgery. Gravity-assisted valve design has become a standard device to avoid overdrainage in many European pediatric hydrocephalus centers. However, the use of a gravitational valve for relieving(More)
The objective of the study was to generate prospective data to assess the clinical results after dynamic stabilization with the Cosmic® system (Ulrich Medical). Between April 2006 and December 2007, 103 consecutive patients were treated with Cosmic® for painful degenerative segmental instability ± spinal stenosis. The preoperative workup included(More)