This is where researchers measure the intradiscal pressure (pressure on the spinal discs) in response to compressive load. You’re probably familiar with this chart (below) by Nachemson, where he displays how disc pressure changes (increases and/or decreases) depending on body position.

Semantic Scholar extracted view of "Lumbar intradiscal pressure. Experimental studies on post-mortem material." by A. Nachemson

MEASUREMENT OF INTRADISCAL PRESSURE By ALF NACHEMSON The nucleus pulposus consists of a three dimensional network of collagen fibres, enmeshed in a mucoprotein gel which contains various mucopolysaccharides (Hirsch, Paulson, SylvCn & Snellman ; Bernardi, Happey & Naylor). The water content of the nucleus pulposus dimin- ALF NACHEMSON Lumbar Intradiscal Pressure Experimental studies on post-mortem material EJNAR MUNKSGAARD - COPENHAGEN 1960 LUMBAR DISCOMETRY LUMBAR INTRADISCAL PRESSURE MEASUREMENTS IN VIVO. Alf Nachemson, M.D. Uppsala. Alf Nachemson. Affiliations. Biomechanics Laboratory and Department of Orthopedic Surgery, University of California, San Francisco, United States and Department of Orthopaedic Surgery, University of Gothenburg, Sweden.

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. As the most direct method of estimating spinal loads, intradiscal pressure (IDP) has been extensively studied in intervertebral discs in vivo (Nachemson and Morris, 1964, Sato et al., 1999, Takahashi et al., 2006, Wilke et al., 1999) and in vitro (McNally and Adams, 1992, Nachemson, 1960, Naylor and Smare, 1953, Panjabi et al., 1988) over the past six decades. Nachemson, A. 1963: The influence of spinal movements on the lumbar intradiscal pressure and on the tensile stresses in the annulus fibrosus. Acta Orthop. Scand . However, Alf Nachemson, M.D., Ph.D., the Swedish orthopedist who pioneered studies of intradiscal pressure severely criticized the experimental setup [22].

アルフ・ナッケムソン（ Alf Nachemson MD, PhD、 1931年 6月1日 - 2006年 12月4日）は、スウェーデン生まれの整形外科医師。Professor, Sahlgrenska University Hospital and Göteborg University。. 腰痛の原因解明と治療に多大な業績を残した。.

2016-04-11 · As the most direct method of estimating spinal loads, intradiscal pressure (IDP) has been extensively studied in intervertebral discs in vivo (Nachemson and Morris, 1964, Sato et al., 1999, Takahashi et al., 2006, Wilke et al., 1999) and in vitro (McNally and Adams, 1992, Nachemson, 1960, Naylor and Smare, 1953, Panjabi et al., 1988) over the past six decades. 2008-08-01 · Intradiscal pressure (IDP) is the hydrostatic pressure measured in the nucleus pulposus of a non-degenerate intervertebral disc.

An interesting observation was that changes in intradiscal pressure appeared to be minimal until a threshold distraction tension was reached. When the threshold was exceeded the intradiscal pressure was observed to decrease dramatically to levels in excess of 300 mm Hg below the positive pressure observed prior to the application of pelvic tension.

Standing pressure was found to be between 0.48 MPa to 0.50 MPa. 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. 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 LUMBAR DISCOMETRY LUMBAR INTRADISCAL PRESSURE MEASUREMENTS IN VIVO. Alf Nachemson, M.D. Uppsala .

Scand . 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.
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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.

To study the loading conditions of the human spine he developed a method for intradiscal pressure measurements. An interesting observation was that changes in intradiscal pressure appeared to be minimal until a threshold distraction tension was reached. When the threshold was exceeded the intradiscal pressure was observed to decrease dramatically to levels in excess of 300 mm Hg below the positive pressure observed prior to the application of pelvic tension.
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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. 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

Even the famous Alf Nachemson studies on disc pressures showed increased Hg (on discs, which I equate with increased loading on the spine) with flexed postures, esp. slumped sitting or leaning forwards seated into flexed posture. Disc pressure measurements in para- and tetraplegic patients.

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.

J Bone Joint Surg Am 1964; 46(5): 1077-92. [12] Nachemson ALF. Nachemson A, Morris Jm (1964) In Vivo Measurements of Intradiscal Pressure. Discometry, A Method For The Determination Of Pressure In The Lower Lumbar Discs. J Bone Joint Surg Am 46: 1077-1092. 2.

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). New in vivo measurements of pressures in the intervertebral disc in daily life. Spine 1999; 24(8): 755-62. [11] Nachemson ALF, Morris JM. In vivo measurements of intradiscal pressure: discometry, a method for the determination of pressure in the lower lumbar discs.

アルフ・ナッケムソン （ Alf Nachemson MD, PhD、 1931年 6月1日 - 2006年 12月4日 ）は、 スウェーデン 生まれの 整形外科 医師。Professor, Sahlgrenska University Hospital and Göteborg University。. 腰痛の原因解明と治療に多大な業績を残した。.

アルフ・ナッケムソン（ Alf Nachemson MD, PhD、 1931年 6月1日 - 2006年 12月4日）は、スウェーデン生まれの整形外科医師。Professor, Sahlgrenska University Hospital and Göteborg University。. 腰痛の原因解明と治療に多大な業績を残した。.