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In Vivo Measurements of Intradiscal Pressure: Discometry, a Method for the Determination of Pressure in the Lower Lumbar Discs Volume 51 of Technical report, University of California Biomechanics Laboratory: Authors: Alf Louis Nachemson, James Marshall Morris: Contributor: United States. Veterans Administration: Publisher PDF | On Apr 1, 2007, Björn Rydevik and others published Alf Nachemson, MD, PhD, 1931–2006: an exceptional pioneer in spine care | Find, read and cite all the research you need on ResearchGate Title. 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.

Discometry, A Method For The Determination Of Pressure In The Lower Lumbar Discs. J Bone Joint Surg Am 46: 1077-1092. 2. Nachemson A, Elfström G (1970) Intravital dynamic pressure measurements in lumbar discs. A study of common movements maneuvers and exercises.

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.

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Biomechanics Laboratory and Department of Orthopedic Surgery, University of California, San Francisco, United States and Department of Orthopaedic Surgery, University of Gothenburg, Sweden. Abstract. By measurement of intradiscal pressure in vitro, the hydrostatic properties of the nucleus pulposus of normal lumbar intervertebral disc were proven.

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Effect of lumbar traction on intradiscal pressure. Measurements in the 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. In a letter to the editor of Journal of Nuerosurgery, Dr. Alf Nachemson, whose work on intradiscal pressure is quoted in this study, stated that he believed the test results obtained were invalid on four accounts: • The design did not incorporate a closed system to measure the pressure of the disc, which Lumber intradiscal pressure : experimental studies on post-mortem materials / Alf Nachemson .

The most reliable results seemed to come from the intradiscal pressure measurements from studies by Nachemson, 1966. A new similar study by Wilke et al. (1999) complemented the present study and confirmed some of the earlier data, although it contradicted others. The new data did not confirm that the load on the spine is higher in sitting compared with standing and did not find distinct differences between positions in which subjects were lying down. 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 data are from pioneering intradiscal pressure measure-ments recorded by Nachemson during the 1960s. Since that time, there have been few data to corroborate or dispute those ﬁndings. Methods.
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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).

The pressure was registered both in the horizontal position and during tilting on a table, during the performance of a standardized exercise program for the upper extremities, as well as during cough, during abdominal strain and while the subjects were being turned from the supine to the lateral position. High intradiscal pressures (ten to fifteen kilograms per square centimeter) were found in the normal discs with the subject in the sitting position. In all cases, pressures were highest in the sitting position, about 30 per cent less in the standing position, and about 50 per cent less in the reclining than in the sitting position. 2007-02-14 · In the mid-1950s Alf Nachemson was given an assistant research position under Professor Carl Hirsch at Uppsala University Hospital.
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Disc pressure measurements in para- and tetraplegic patients. A study of of mobilization and exercise in para- and tetraplegic patients. Hein-Sørensen O, Elfström G, Nachemson A. The intradiscal lumbar pressure was measured in 10 patients with para- or tetraplegia and in one normal subject. In Vivo Measurements of Intradiscal Pressure: Discometry, a Method for the Determination of Pressure in the Lower Lumbar Discs Volume 51 of Technical report, University of California Biomechanics Laboratory: Authors: Alf Louis Nachemson, James Marshall Morris: Contributor: United States.

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12, 185 (1963). Google Scholar Objective: 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. Methods : Under sterile surgical conditions, a pressure transducer with a diameter of 1.5 mm was implanted in the nucleus pulposus of a nondegenerated L4-L5 disc of a male volunteer 45-years-old and weighing 70 kg. We conducted intradiscal pressure mea-surements with one volunteer performing various activities normally found in daily life, sports, and spinal therapy. Objectives.

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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. 301 Moved Permanently. nginx Intradiscal Pressure in the Normal and Degenerated Discs.

Intradiscal Pressure (m mHg) 0 75 47-25 55-39 58-43 69-66 4 F 41 Traction tension (l bs) Intradiscal Pressure (m mHg) 0 60 20 30 40-76 55-110 60-126 63-117 65-160 70-106 5 M 34 Traction tension (l bs) Intradiscal Pressure (m mHg) 0 62 50-106 90-138 94-134 98-157 Table 1. Effect of lumbar traction on intradiscal pressure. 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.