Tommy Hansson Göteborgs universitet

Measurements in the There is not a lot of data on intradiscal pressure (IDP) from (live) human subjects except for Alf Nachemson, Hans-Joachim Wilke, and one other person whose name escapes me. From a computational standpoint, comparisons with IDP should be taken only as a sanity check. Measurement of intradiscal pressure is instrumental in explaining, from a mechanical point, the occurrence of posterior ruptures in the lumbar discs, and provides a basis for the rational treatment of patients with low-back pain in so far as these exhibit increase of pain on increased mechanical loads. The L5 (last low back) disc has the greatest pressure. In addition, disc pressure changes with changes in bodily positions and activities. Pioneering Swedish orthopedic specialist and professor Alf Nachemson, MD, PhD, [1931-2006] developed a method to measure intradiscal pressures (3). intradiscal pressure measurements showed that distraction tension routinely applied by the VAX-D equipment reduced the intradiscal pressure significantly, to negative levels in the range of-100 to -160 mm Hg. The relationship between distraction tensions and intradiscal pressure changes for three patients is presented in Table 1.

Avoiding excessive intradiscal pressure (Fig. 14.2) a The sitting-forward position: lumbar intradiscal pressure. 4 Jun 2014 The L5 (last low back) disc has the greatest pressure. Pioneering Swedish orthopedic specialist and professor Alf Nachemson, MD, PhD, Based in part on his intradiscal pressure studies, Dr. Nachemson notes that 80% o By measurement of intradiscal pressure in vitro, the hydrostatic properties of the nucleus pulposus of normal lumbar intervertebral disc were proven. 14 Jan 2020 1960's poster adapted from Alf Nachemson's research depicting the intradiscal pressure in the lumbar spine in various postures. The theory First, Alf Nachemson in the 1960s published ings and Nachemson did not himself propose that the lumbar intradiscal pressure on the tensile stresses in. This reversal of pressure creates an intradiscal vacuum that helps to reposition A.B. Schultz, Alf Nachemson, MD PhD, Intervertebral Disc Pressures During compresses the spine, creating negative pressures' Axial Decompression on Intradiscal Pressure, Journal of Neurosurgery, 81(3), 1994.

To study the loading conditions of the human spine he developed a method for intradiscal pressure measurements. Intravital Dynamic Pressure Measurements in Lumbar Discs: A Study of Common Movements, Maneuvers and Exercises Issue 1 of Scandinavian journal of rehabilitation medicine: Supplement, ISSN 0346-8720: Authors: Alf Nachemson, Gösta Elfström: Publisher: Almqvist & Wiksell, 1970: Original from: the University of Michigan: Digitized: Aug 13, 2008 1. Introduction.

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regarding intradiscal pressure and to the methods of Shirazi-Adl for data for other material characteristics (see text for these references). The mid-position model bears a load of 294 N in the vertical direction, while the models of the flexed and extended positions bear loads of 15 N-m. Measurement of intradiscal pressure is instrumental in explaining, from a mechanical point, the occurrence of posterior ruptures in the lumbar discs, and provides a basis for the rational treatment of patients with low-back pain in so far as these exhibit increase of pain on increased mechanical loads. Intravitally-performed measurements of disc pressure over the last 20 years in more than 100 individuals have demonstrated how the load on the lumbar disc varies with the position of the subject's body and during the performance of various tasks, both in standing and in sitting. Validation of a biomechanical analysis by measurements of intradiscal pressures and myoelectric signals.

Lumbar intradiscal pressure - LIBRIS

per sq. in.) and 10-4 kg. per sq. cm. (147 lb. per sq. in.) in the subjects measured.

腰痛の原因解明と治療に多大な業績を残した。. The object of this study was to examine the effect of vertebral axial decompression on pressure in the nucleus pulposus of lumbar discs. Intradiscal pressure measurement was performed by connecting a cannula inserted into the patient's L4-5 disc space to a pressure transducer. The intradiscal pressure of the human thoracic spine has been poorly investigated. While several previous in vivo and vitro studies determined the intradiscal pressure of the cervical and lumbar spine, the hydrostatic pressure in thoracic intervertebral discs was solely explored in a single in vivo study (Polga et al., 2004). Considerations on the later studies on intradiscal pressures. Studies, from Japan, Sato ( Sato et al., 1999 ) , using a piezoresistive sensor in the transducer needle detecting the pressure laterally at a window and not at the needle tip, confirmed the pioneering findings of Nachemson and examining the changes in the more relevant L4/5 disc rather than the L3/4.
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Study design: We conducted intradiscal pressure measurements with one volunteer performing various activities normally found in daily life, sports, and spinal therapy. Objectives: The goal of this study was to measure intradiscal pressure to complement earlier data from Nachemson with dynamic and long-term measurements over a broad range of activities. Nachemson, A.: The influence of spinal movements on the lumbar intradiscal pressure and on the tensile stresses in the annulus fibrosus.

31. Juli 1998 wissen wir von Alf Nachemson, einem schwedischen Forscher. Titel New intradiscal pressure measurements in vivo during daily activities patients are required to undergo surgery (Deyo , Nachemson , and Mirza 2004). vertebral motion, intradiscal pressure, and the pullout force applied to the screws.
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Tommy Hansson Göteborgs universitet

Intravital dynamic pressure measurements in lumbar discs. A study of common movements, maneuvers by late Alf Nachemson, by inter-discipline migrations. A 3rd Special Issue of the Journal of Biomechanics including 32 original articles is now available online. 15 Sep 2015 (2001) wanted to compare intradiscal pressures and spinal fixator loads Nachemson (1966, 1981) reported 40% higher intradiscal pressure 21 Aug 2010 ABSTRACT.

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4 They measured in vivo loading of the spine during different postures Intradiscal pressure under axial compression Axial compression exhibited a strong decrease in the intradiscal pressure from the upper cervical to the upper lumbar region, from where the pressure remained almost constant towards the sacrum (Fig. 3).