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This comprehensive anatomical study on bones and X-rays regarding pedicles of lumbar …
Biology Articles » Anatomy & Physiology » Anatomy, Human » Morphometry of Vertebral Pedicles: a Comprehensive Anatomical Study in the Lumbar Region » Material and Method
The study was divided in two parts. In
the first part of the present work fully ossified 200 male and 200
female lumbar vertebrae greater than 20 years of age were used for
direct gross morphometry of the pedicles. They were collected from
preserved sets of bones obtained from individual cadavers received at
Department of Anatomy, KMC, Mangalore. Only the normal and completely
ossified vertebrae were included in the study. Lumbar vertebrae for
osteometric study were kept on the table and different measurements
were taken directly on the bones. Sliding vernier caliper was used to
measure the different parameters. The Vernier caliper is an extremely
precise measuring instrument; the reading error is 1/20 mm = 0.05 mm.
To ensure that the full diameters were measured, the different axes of
the pedicles were kept perpendicular to the caliper. The jaws were
closed lightly on the vertebral pedicles. Each parameter was measured
twice and then recorded. The methodology followed was as described in
Hrdlicka's Practical Anthropometry (1952). Following measurements were
performed on both sides and were recorded in mm.
In the second part of the present
work, plain anteroposterior radiographs of the lumbar spine of 500
individuals (250 males and 250 females) from different age groups (age
span of 10 years) ranging from 10-70 years were studied. No individuals
were exposed to X-rays; rather radiographs were collected from patient
records of different emergency hospitals in Mangalore. Only easily
readable x-ray films, certified as normal spine radiographs by a
radiology expert were used in the study. Radiographs from male and
female individuals were categorized separately into six age groups,
each with age span of 10 years. Distribution of samples according to
sex and different age groups are shown in Table I.
Two different diameters of the
pedicles seen as extremes of their outline in the x-ray films were
measured bilaterally in two planes perpendicular to each other (Fig. 2).
The maximum dimension of the pedicle in the sagittal plane was recorded
as vertical diameter (h) in mm. The maximum diameter of the pedicle in
horizontal plane at right angles to the vertical diameter was recorded
as (t) in mm. Terminal points of the pedicle were labeled by a fine
marker. Radiographs were scanned and then computer was used to measure
the diameters of the right and left pedicles of all the lumbar
vertebrae and values were recorded in mm.
Statistical Analysis. All the
results have been expressed as mean ± SEM. 'Z' test was employed for
all the statistical comparisons. Any value of PO.05 or Z (Normal
deviate) > 1.96 was regarded as significant.
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