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BACKGROUND There is an increasing recognition of the clinical importance of the sagittal plane alignment of the spine. A prospective study of several radiographic parameters of the sagittal profile of the spine was conducted to determine the physiological values of these parameters, to calculate the variations of these parameters according to(More)
Using a specialized orthopedic software package, the authors investigated the sagittal spinal shape and the position of the pelvis in the space in patients with isthmic spondylolisthesis and in persons with no such symptoms. Digitized lateral spinal radiographs of 30 healthy volunteers and 48 patients were evaluated. The absolute values and significant(More)
The sagittal shape of the spine, particularly its sagittal balance, currently is being extensively investigated. The major purpose of this study is to examine the measurement repeatability of SpineView software, which calculates 13 independent variables, to shorten and facilitate the measurement of lateral spinal radiographs; another purpose is to collect(More)
Using a special software program we measured spinopelvic parameters on digitised radiographs of the entire spine and the pelvis of 50 patients with lumbar disc herniation and compared these with the same measurements on 30 healthy subjects. In the disc hernia group the patients had a relatively straight spine in the sagittal plane. The sacrum was more(More)
PURPOSE OF THE STUDY Parameters determining sagittal balance are essential for optimal analysis and treatment of many spinal disorders. The purpose of this work was to validate a software designed to measure the principal parameters involved in sagittal balance of the spine. MATERIAL AND METHODS Six parameters (lumbar lordosis, thoracic kyphosis, sagittal(More)
The present study is a numerical comparison using finite-element analysis (FEA) of two different concepts of spinal fixation devices when implanted. These implants are 1) the Easy®, “rigid” Screw/Rod (ø 6mm) system; 2) the Twinflex®, “dynamic” system (ø 2 X 2.5 mm ELF). A parameterised 3D FEA model of an L3-sacrum segment, developed by Lavaste, Skalli &(More)
Presently, the kinematic disc prosthesis model (SB Charité) is the best disc replacement compromise, and is the basis of the evolution of the prosthetic concept at the dawning of the year 2000. Clinical results of a homogeneous series of 105 cases with a mean followup of 51 months show 79% of the patients had an excellent result and 87% returned to work,(More)
PURPOSE OF THE STUDY There are many anatomic descriptions of the spine, but most concentrate on qualitative information. Quantitative data is however important to achieve a better clinical approach, to adapt implant size and to construct geometric models of spine mechanics. MATERIAL AND METHODS We examined 32 dry spines (160 lumbar vertebrae) obtained(More)
The load-displacement behaviour of six fresh human cadaveric L2–L3 spinal segments was studied through in vitro testing in flexion, and torsion. The lumbar spinal units were tested firstly intact, then instrumented by the SB Charité III intervertebral disc prosthesis with respect to the surgical requirements. These experiments highlighted an increase of(More)