Compressive Strength

Publication Title: 
Journal of Biomechanical Engineering

The human facet joint capsule is one of the structures in the lumbar spine that constrains motions of vertebrae during global spine loading (e.g., physiological flexion). Computational models of the spine have not been able to include accurate nonlinear and viscoelastic material properties, as they have not previously been measured. Capsules were tested using a uniaxial ramp-hold protocol or a haversine displacement protocol using a commercially available materials testing device. Plane strain was measured optically.

Author(s): 
Little, Jesse S.
Khalsa, Partap S.
Publication Title: 
The Spine Journal: Official Journal of the North American Spine Society

BACKGROUND CONTEXT: The intervertebral disc is a common source of low back pain (LBP). Prospective studies suggest that treatments that intermittently distract the disc might be beneficial for chronic LBP. Although the potential exists for distraction therapies to affect the disc biomechanically, their effect on intradiscal stress is debated.

Author(s): 
Gay, Ralph E.
Ilharreborde, Brice
Zhao, Kristin D.
Berglund, Lawrence J.
Bronfort, Gert
An, Kai-Nan
Publication Title: 
Tissue Engineering. Part A

Mechanical training of engineered tissue constructs is believed necessary to improve regeneration of cartilaginous grafts. Nevertheless, molecular mechanisms underlying mechanical activation are not clear. This is partly due to unavailability of appropriate scaffolds allowing exposure of cells to dynamic compressive strains (DCS) in vitro while permitting subsequent molecular analyses.

Author(s): 
Nam, Jin
Rath, Bjoern
Knobloch, Thomas J.
Lannutti, John J.
Agarwal, Sudha
Publication Title: 
Journal of Neurophysiology

Muscle spindles contribute to sensorimotor control by supplying feedback regarding muscle length and consequently information about joint position. While substantial study has been devoted to determining the position sensitivity of spindles in limb muscles, there appears to be no data on their sensitivity in the low back. We determined the relationship between lumbar paraspinal muscle spindle discharge and paraspinal muscle lengthening estimated from controlled cranialward movement of the L(6) vertebra in anesthetized cats.

Author(s): 
Cao, Dong-Yuan
Pickar, Joel G.
Ge, Weiginq
Ianuzzi, Allyson
Khalsa, Partap S.
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

OBJECTIVES: To provide preliminary information on whether a regimen of 30 chiropractic treatments that combines ischemic compression and spinal manipulation effectively reduces the intensity of pain, sleep disturbance, and fatigue associated with fibromyalgia. In addition, to study the dose-response relation and identify the baseline characteristics that may serve as predictors of outcome. DESIGN: Subjects were assessed with self-administered questionnaires taken at baseline, after 15 and 30 treatments, and 1 month after the end of the treatment trial. SETTING: Private practice.

Author(s): 
Hains, G.
Hains, F.
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

OBJECTIVES: To provide preliminary information on whether a regimen of 30 chiropractic treatments that combines ischemic compression and spinal manipulation effectively reduces the intensity of pain, sleep disturbance, and fatigue associated with fibromyalgia. In addition, to study the dose-response relation and identify the baseline characteristics that may serve as predictors of outcome. DESIGN: Subjects were assessed with self-administered questionnaires taken at baseline, after 15 and 30 treatments, and 1 month after the end of the treatment trial. SETTING: Private practice.

Author(s): 
Hains, G.
Hains, F.
Publication Title: 
Journal of Neurophysiology

Muscle spindles contribute to sensorimotor control by supplying feedback regarding muscle length and consequently information about joint position. While substantial study has been devoted to determining the position sensitivity of spindles in limb muscles, there appears to be no data on their sensitivity in the low back. We determined the relationship between lumbar paraspinal muscle spindle discharge and paraspinal muscle lengthening estimated from controlled cranialward movement of the L(6) vertebra in anesthetized cats.

Author(s): 
Cao, Dong-Yuan
Pickar, Joel G.
Ge, Weiginq
Ianuzzi, Allyson
Khalsa, Partap S.
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