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The Dynesys, a flexible posterior stabilization system that provides an alternative to fusion, is designed to preserve intersegmental kinematics and alleviate loading at the facet joints. Recent biomechanical evidence suggests that the overall range of motion (ROM) with the Dynesys is less than the intact spine. The purpose of this investigation was to(More)
STUDY DESIGN Prospective cohort study. OBJECTIVES To prospectively validate the application of appendicular surgical oncology principles to the treatment of primary bone tumors of the spine at a quaternary care spine center using local recurrence, survival, and health-related quality of life as outcome measures. SUMMARY OF BACKGROUND DATA There is clear(More)
STUDY DESIGN An in vitro biomechanical study to quantify 3-dimensional kinematics of the lumbar spine following facet arthroplasty. OBJECTIVES To compare the multidirectional flexibility properties and helical axis of motion of the Total Facet Arthroplasty System (TFAS) (Archus Orthopedics, Redmond, WA) to the intact condition and to posterior pedicle(More)
STUDY DESIGN Facet contact forces in the lumbar spine were measured during flexibility tests using thin film electroresistive sensors in intact cadaveric spine specimens and in injured specimens stabilized with a dynamic posterior system. OBJECTIVE The purpose of this study was to investigate the effect of the Dynesys system on the loading in the facet(More)
Three doses of moxifloxacin 400 mg qd were administered orally to 20 candidates for knee arthroscopy (mean age, 71.2 years). The procedure was scheduled at four different points of time after the last dose: 2, 6, 12, and 24 h. Five patients were studied at each point of time. Drug levels were determined by the bioassay method. Bactericidal activity against(More)
STUDY DESIGN Systematic review. OBJECTIVES To review the various radiographic parameters currently used to assess traumatic thoracolumbar injuries, emphasizing the validity and technique behind each one, to formulate evidence-based guidelines for a standardized radiographic method of assessment of these fractures. SUMMARY OF BACKGROUND DATA The(More)
OBJECT The authors evaluated the accuracy of placement and safety of pedicle screws in the treatment of unstable thoracic spine fractures. METHODS Patients with unstable fractures between T-1 and T-10, which had been treated with pedicle screw (PS) placement by one of five spine surgeons at a referral center were included in a prospective cohort study.(More)
STUDY DESIGN A case report. OBJECTIVES To describe the unique challenges and novel surgical approach to treatment of vertebral osteosarcoma involving the dura as a margin. SUMMARY OF BACKGROUND DATA Osteosarcoma of the vertebral column is a rare, malignant osseous tumor, carrying a poor prognosis. Currently, best available evidence supports that optimal(More)
BACKGROUND CONTEXT The thoracic spine exhibits a unique response to trauma as the result of recognized anatomical and biomechanical differences. Despite this response, clinical studies often group thoracic fractures (T1-T10) with more caudal thoracolumbar injuries. Subsequently, there is a paucity of literature on the functional outcomes of this distinct(More)
BACKGROUND CONTEXT Benign tumors of the vertebrae are generally an uncommon cause for surgery. Complete removal of these tumors requires in most cases extensive surgical technique that consists of generous surgical exposure followed by laminectomy, facetectomy, and sometimes even an instrumented fusion. PURPOSE The aim was to describe our experience in(More)