Heights of the Lumbar Intervertebral Discs Related to Age in Turkish Idividuals.

Abstract

The present study investigated the changes in the heights and anteroposterior diameters of human intervertebral discs by means of measurements from radiographs, to determine age changes of lumbar intervertebral discs in Turkish people. Measurements of anterior and posterior disc heights and disc depths were made for 200 clinic subjects of different age groups from lateral radiographs. The height of the intervertebral disc increases with aging only in males and the disc depth in both sexes. Our findings generally corroborate previous studies. It is suggested that the different findings from the present study might be peculiar to the society.

Computational pharmacokinetics of solute penetration into human intervertebral discs—Effects of endplate permeability, solute molecular weight and disc size

“…To identify the sensitivity of concentration profiles on the disc geometry, the reference mesh of an L2-L3 lumbar disc (Shirazi-Adl, 1989) is altered in all directions by either 7 10% or 7 20%. These geometries fall within those reported for the thoracolumbar discs (Aydinlioglu et al, 1999;Shirazi-Adl, 1994;Twomey and Taylor, 1985). These simulations are also helpful in attempts to extrapolate results to animals with much smaller discs.…”

“…8). The altered disc dimensions are well within range of variations in human thoracolumbar discs (Aydinlioglu et al, 1999;Shirazi-Adl, 1994;Twomey and Taylor, 1985). These changes could also be used to evaluate the effect on penetration of substantial alterations in the disc height in the sagittal plane present at the lower L4-S1 lumbar discs.…”

Age-dependent changes of the normal human spine during adulthood

“…Yet, it is known that aging leads to a decreased number of myelinated fibers and an increase in connective tissue in the spinal nerve roots (Dunn, 1912;Corbin et al, 1937). Also, the intervertebral disk shows age-related size alterations (Twomey et al, 1985;Amonoo-Kuofi, 1991;Aydinlioglu et al, 1999;Shao et al, 2002), usually an increase in height because of the more prominent concavity of the neighboring vertebral bodies with age. However, there seems to be no change at all in the dorsal root/ventral root ratio with age (Corbin et al, 1937), but, for example, in growing rats, the increase in nerve fibers was for a longer time and more intense in the dorsal nerve root (Dunn, 1912).…”

Anatomic-Imaging Correlations of Lumbar Disk-Vertebral Morphometric Indices

“…The relative disk-vertebral index (R.I), respectively the disk height-body height ratio (Brandner, 1970;Amonoo-Koufi, 1985, 1991Aydinlioglu et al, 1999), adds to the disk-vertebral angle degree attempting to complete as precisely as possible the image of dimensional ratios between the body and the disk and obtaining the ratio between the sum of intervertebral disk heights (AHIVD and PHIVD) and the sum of corresponding vertebral bodies heights (AHV + PHV). R.I = AHIVD + PHIVD / AHV + PHV.…”

“…The dimensional values of the vertebral body and intervertebral disk can be globally and highly suggestively expressed by the disk angle (wedge index) and must not be mistaken for the vertebral-disk angle (Aharinejad et al;Eijkelkamp;Aydinlioglu et al;Amono-Kuofi;Gepstein et al, 1991). There are two methods to calculate this index: -calculation according to the formula AHIVD -PHIVD / APD, where APD represents the maximum anterior-posterior disk diameter (AHIVD and PHIVD are the anterior, respectively posterior height of the disk); -calculation according to the formula sin-1 x (AHIVD -PHIVD) / 1/2 (SD + ID), where SD and ID are the superior, respectively inferior diameters of the vertebral faces adjacent to the disk.…”