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Lumbar bone density -

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  • Lumbar bone density -


    We are involved in work concerning human tolerance to the rapid vertical
    accelerations imposed as a result of ejection from aircraft. The most
    frequent injury that currently occurs from such an event is an anterior
    lip fracture at (typically) the T12-L1 level.

    We are especially interested in whether individuals of different size or
    of different sex will be at different risk of suffering injuries of the
    vertebral column during ejection events. For obvious reasons we are only
    interested in subjects who are prior to the event, believed to be
    clinically healthy.

    We have been conducting a range of literature reviews and there seem to
    be some areas which are lacking in information particularily with
    respect to lordosis and gender differences in the musculo-skeletal
    properties of healthy subjects. So, we would be grateful for any
    information on the following subjects.

    * What (if any) is the difference in the degree of lordosis
    between (healthy) males and females in sitting and standing postures?.
    * Is it possible to accurately and repeatably measure lordosis
    using non-invasive techniques?
    * Does the degree of lordosis vary through the day, for example in
    the same way that the overall length of the vertebral column reduces
    through the day ?
    * Are there significant gender differences in bone mass
    distribribution. That is, is the bone density of, say a given vertebrae
    in the female different from that of the same vertebrae in the male?
    * What gender differences (if any) exist in the mass, length,
    cross-section or fatigue properties of the muscles that support the
    vertebral column.

    Responses will be posted.

    Many Thanks

    Mike Llewellyn, Ph.D.
    Protection & Performance Department
    Centre for Human Sciences
    Defence Evaluation & Research Agency.
    Farnborough, UK.

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