Stephen Levin - Academia.edu (original) (raw)
Independent researcher. Originator of the biotensegrity model.Orthopedic surgeon (ret)
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Papers by Stephen Levin
Oxford Textbook of Musculoskeletal Medicine, 2015
Abstract: In medicine, objects that need to be removed later-such as stents-are commonly placed i... more Abstract: In medicine, objects that need to be removed later-such as stents-are commonly placed in patients, with the time of removal dependent on progress of the patient. In these cases biodegradable materials that last for a specific time may not be suitable. We propose a new class of nanostructured materials that can hold their form as long as wanted, Triggered, Nanostructured Biodegradables (TNBs), that can be disintegrated to micro-or nanoscaled components when externally triggered on command to do so.
Advances in Bioengineering, 2003
Journal of Bodywork and Movement Therapies, 2014
Journal of biomechanics, 2000
Journal of Biomechanics - J BIOMECH, 2005
The scapula is a sesamoid bone. Stephen Michael Levin. Potomac Back Center, 8608 Dixie Place, Mcl... more The scapula is a sesamoid bone. Stephen Michael Levin. Potomac Back Center, 8608 Dixie Place, Mclean, VA 22102, USA. Available online 26 January 2005. Article Outline. References. Gupta and van der Helm (2004) use finite ...
Spine, 1994
The structure-function relationship of anulus fibrosus of nondegenerate lumbar intervertebral dis... more The structure-function relationship of anulus fibrosus of nondegenerate lumbar intervertebral discs was investigated. The tensile properties and biochemical composition of single lamella specimens from human anulus fibrosus and their variations with anatomic region were determined. Regional differences in composition and ultrastructure suggest differences in tensile properties. Single lamella specimens were isolated from the anulus, equilibrated in 0.15 mol/L NaCl and tested in uniaxial tension using a slow strain-rate protocol. Adjacent specimens were used to determine biochemical composition (including hydration, collagen, proteoglycan, and hydroxypyridinium crosslink density). Tensile properties, biochemical composition, and anatomic location were compared. Significant radial and circumferential variations in tensile properties of anulus were detected, with the anterior being stiffer than the posterolateral regions, and the outer being stiffer than the inner regions. The regional differences in tensile properties may result predominantly from structural rather than compositional variations and may contribute to the clinical frequency of anulus failure in the posterolateral region.
Oxford Textbook of Musculoskeletal Medicine, 2015
Abstract: In medicine, objects that need to be removed later-such as stents-are commonly placed i... more Abstract: In medicine, objects that need to be removed later-such as stents-are commonly placed in patients, with the time of removal dependent on progress of the patient. In these cases biodegradable materials that last for a specific time may not be suitable. We propose a new class of nanostructured materials that can hold their form as long as wanted, Triggered, Nanostructured Biodegradables (TNBs), that can be disintegrated to micro-or nanoscaled components when externally triggered on command to do so.
Advances in Bioengineering, 2003
Journal of Bodywork and Movement Therapies, 2014
Journal of biomechanics, 2000
Journal of Biomechanics - J BIOMECH, 2005
The scapula is a sesamoid bone. Stephen Michael Levin. Potomac Back Center, 8608 Dixie Place, Mcl... more The scapula is a sesamoid bone. Stephen Michael Levin. Potomac Back Center, 8608 Dixie Place, Mclean, VA 22102, USA. Available online 26 January 2005. Article Outline. References. Gupta and van der Helm (2004) use finite ...
Spine, 1994
The structure-function relationship of anulus fibrosus of nondegenerate lumbar intervertebral dis... more The structure-function relationship of anulus fibrosus of nondegenerate lumbar intervertebral discs was investigated. The tensile properties and biochemical composition of single lamella specimens from human anulus fibrosus and their variations with anatomic region were determined. Regional differences in composition and ultrastructure suggest differences in tensile properties. Single lamella specimens were isolated from the anulus, equilibrated in 0.15 mol/L NaCl and tested in uniaxial tension using a slow strain-rate protocol. Adjacent specimens were used to determine biochemical composition (including hydration, collagen, proteoglycan, and hydroxypyridinium crosslink density). Tensile properties, biochemical composition, and anatomic location were compared. Significant radial and circumferential variations in tensile properties of anulus were detected, with the anterior being stiffer than the posterolateral regions, and the outer being stiffer than the inner regions. The regional differences in tensile properties may result predominantly from structural rather than compositional variations and may contribute to the clinical frequency of anulus failure in the posterolateral region.