2008-08-01

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.

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. Nachemson, A.: The influence of spinal movements on the lumbar intradiscal pressure and on the tensile stresses in the annulus fibrosus. Acta Orthop. Scand. 12, 185 (1963). Google Scholar Study design: We conducted intradiscal pressure measurements with one volunteer performing various activities normally found in daily life, sports, and spinal therapy.

2015-02-11 Alf Nachemson illustrated the amount of pressure exerted on the spinal discs in standing, sitting and carrying as opposed to lying. As you can see in the chart below, as soon as we go from lying to standing, the pressure on the discs is 400 percent higher and continues to increase in bending and sitting. 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.

*FREE* shipping on qualifying offers. In vivo measurements of intradiscal pressure;: Discometry, a method for the determination of pressure in the lower lumbar disc, ([Technical report]) [Nachemson, Alf Louis] on Amazon.com.

We referred to data from Nachemson and from Sato et al. 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.

Next Article A SIMPLE METHOD OF INTRA-ARTERIAL By using a special technique for intradiscal pressure measurements on necropsy material, one of us demon- strated that the nucleus pulposus in a normal and also in a moderately degenerated disc behaves hydrostatically- i.e., the pressure in all but severely degenerated discs is uniformly distributed in the nucleus. 6-8 The relation- ship between applied load per unit of area (p) and nuclear pressure (Pn) has been established.

[37] Alf Nachemson. The lumbar spine and back pain, chapter 9. Lumbar mechanics as re- vealed by lumbar intradiscal pressure measurements, pages

Intravital dynamic pressure measurements in lumbar discs: A study of common movements, maneuvers and exercises 2020-01-14 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. 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 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. Nachemson AL: Disc pressure measurements. Spine 6:93-97, 1981 14 Back School The Biomechanical Principles Of Back School 321 Standing 326 Sitting 323 Lying 327 Back school (ryggskola in Swedish, Rückenschule in German) was introduced in Sweden in 1969 by Marianne Zachrisson-Forsell (1980) and Alf Nachemson. In subsequent years it has become the gold standard for rehabilitation and prevention of low back pain. 1975-08-01 The L5 (last low back) disc has the greatest pressure.

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 .
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2007-02-14 · In the mid-1950s Alf Nachemson was given an assistant research position under Professor Carl Hirsch at Uppsala University Hospital. 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.

Intravitally-performed measurements of disc pressure over the 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. Nachemson, A.: The influence of spinal movements on the lumbar intradiscal pressure and on the tensile stresses in the annulus fibrosus. Acta Orthop.
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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.

Alf Nachemson, MD, PhD (1931–2006) Intradiscal pressure in the degenerated porcine intervertebral disc Sten Holm 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. 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).

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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.

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. 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. Fig. 14.2 a, b Intradiscal pressure during lifting with a rounded back and a straight back .