Radiographic studies of lateral flexion in the lumbar spine

Dimnet, J.; Fischer, Louis; Gonon, Gilles; Carret, Jean‐Paul

doi:10.1016/0021-9290(78)90006-4

Cited by 34 publications

(11 citation statements)

References 10 publications

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“…At present, due to the limited resolution in time and narrow working space in three dimensions, only measurements of selected postures are possible [3,6,10,11,[13][14][15]20]. Motion studies of the lumbar spine during flexion were examined two-dimensionally for sagittal plane using fluoroscopy at five images per second [5,12].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional relation of skin markers to lumbar vertebrae of healthy subjects in different postures measured by open MRI

Mörl¹,

Blickhan

2005

Eur Spine J

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Section: Introductionmentioning

confidence: 99%

Three-dimensional relation of skin markers to lumbar vertebrae of healthy subjects in different postures measured by open MRI

Mörl¹,

Blickhan

2005

Eur Spine J

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“…They are the more obvious features of the vertebral body projection and have already been employed by several authors (BREEN, 1991 ;BREEN et al, 1993;CHOLEWICKI et al, 1991;SIMOMS, 1994). Moreover, if the vertebral body is considered to approximate a cylinder (DIMNET et al, 1978), its projection on the radiographic plane is almost invariant for small, out-of-plane rotations. Consequently, these landmarks have the advantage of relative insensitivity to coupled motion (i.e.…”

Section: Vertebral Anatomical Landmarksmentioning

confidence: 99%

“…Most of the in viva studies employing conventional radiography, perform end-of-range measurements, or analyse a very few finite steps of motion (DIMNET et al, 1978;PEARCY and BOGDUK, 1988). The number of exposures that can be obtained from one subject (CHOLEWICKI and MCGILL, 1992) is very limited to maintain radiation at an acceptable level and, in addition, only static images are produced.…”

Section: Introductionmentioning

confidence: 99%

Automatic recognition of vertebral landmarks in fluoroscopic sequences for analysis of intervertebral kinematics

Bifulco

Cesarelli

Allen

et al. 2001

Med. Biol. Eng. Comput.

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Intervertebral kinematics closely relates to the functionality of the spinal segments. Direct measurement of the intervertebral kinematics in vivo is very problematic. The use of a fluoroscopic device can provide continuous screening of the lumbar tract during patient spontaneous motion, with an acceptable, low X-ray dose. The kinematic analysis is intended to be limited to planar motion. Kinematic parameters are computed from vertebral landmarks on each frame of the image sequence. Landmarks are normally selected manually in spite of the fact that this is subjective, tedious to perform and regarded as one of the major contributors to errors in the computed kinematic parameters. The aim of this work is to present an innovative method for the automatic recognition of vertebral landmarks throughout a fluoroscopic image sequence to provide an objective and more precise quantification of intervertebral kinematics. The recognition procedure is based upon comparing vertebral features in two adjacent frames by means of a cross-correlation index, which is also robust despite the low signal-to-noise ratio of the lumbar fluoroscopic images. To provide a quantitative assessment of this method a calibration model was used which consisted of two lumbar vertebrae linked by a universal joint. The reliability and accuracy of the kinematic measurements have been investigated. The errors are of the order of a millimetre for the localisation of the intervertebral centre of rotation and tenths of a degree for the intervertebral angle. Error analysis suggests that this method improves the accuracy of the intervertebral kinematic calculations and has the potential to automate the selection of anatomical landmarks.

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“…The Neural Subsystem (NS) deals with complex Increased functional demands on the spine, subsystem dysfunctions or failures call for compensatory activity and functional enhancement in the sound subsystems beyond the normal levels that is required for overall stability of the spine [14][15][16][17][18]. Lumbo-sacral transitional vertebrae (LSTV) are common variations found in the population [19].…”

Section: Introductionmentioning

confidence: 99%

Complexity of neutral zones, lumbar stability and subsystem adaptations: Probable alterations in lumbosacral transitional vertebrae (LSTV) subtypes

Mahato

2013

Medical Hypotheses

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Radiographic studies of lateral flexion in the lumbar spine

Cited by 34 publications

References 10 publications

Three-dimensional relation of skin markers to lumbar vertebrae of healthy subjects in different postures measured by open MRI

Three-dimensional relation of skin markers to lumbar vertebrae of healthy subjects in different postures measured by open MRI

Automatic recognition of vertebral landmarks in fluoroscopic sequences for analysis of intervertebral kinematics

Complexity of neutral zones, lumbar stability and subsystem adaptations: Probable alterations in lumbosacral transitional vertebrae (LSTV) subtypes

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