Predicting the lumbosacral joint centre location from palpable anatomical landmarks

Andrew James Murphy, A.M.J. Bull, A.H. McGregor

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The kinematics of the lumbar spine have previously been described by considering the bearing of the pelvis and lower back. However earlier studies have not described an intersegmental angle measured about a single point; which is necessary for investigation into movement, posture and balance, and lower back pain and injury. This study used computed tomography (CT) scans of 16 pelves to determine the location of palpable bony landmarks, and the junction of the fifth lumbar and first sacral vertebrae within a pelvis axis system. Data were used to derive equations which express the three-dimensional location of the lumbosacral joint centre as an offset from palpable surface landmarks. The magnitude of X, Y, Z offsets was controlled using individual pelvic geometry, and robustness and repeatability of the method was assessed. Regression equations provided the location of the lumbosacral junction to within 8.2 mm (±3.4 mm) of its true coordinate. Leave-one-out analyses calculated equation coefficients using 15 of the original pelves, with the 16th acting as a control; average errors increased by 6.7 per cent (±0.1 per cent). To the authors' knowledge the current method is the most accurate non-invasive means of locating the lumbosacral junction and may be useful for constructing biomechanical models.
    LanguageEnglish
    Pages1082-1087
    Number of pages6
    JournalProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
    Volume225
    Issue number11
    DOIs
    Publication statusPublished - Nov 2011

    Fingerprint

    Pelvis
    Bearings (structural)
    Spine
    Back Injuries
    Tomography
    Kinematics
    Low Back Pain
    Posture
    Biomechanical Phenomena
    Geometry

    Keywords

    • engineering
    • medical engineering
    • lumbosacral joint
    • lower back
    • joint
    • pelvis
    • spine
    • motion analysis

    Cite this

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    abstract = "The kinematics of the lumbar spine have previously been described by considering the bearing of the pelvis and lower back. However earlier studies have not described an intersegmental angle measured about a single point; which is necessary for investigation into movement, posture and balance, and lower back pain and injury. This study used computed tomography (CT) scans of 16 pelves to determine the location of palpable bony landmarks, and the junction of the fifth lumbar and first sacral vertebrae within a pelvis axis system. Data were used to derive equations which express the three-dimensional location of the lumbosacral joint centre as an offset from palpable surface landmarks. The magnitude of X, Y, Z offsets was controlled using individual pelvic geometry, and robustness and repeatability of the method was assessed. Regression equations provided the location of the lumbosacral junction to within 8.2 mm (±3.4 mm) of its true coordinate. Leave-one-out analyses calculated equation coefficients using 15 of the original pelves, with the 16th acting as a control; average errors increased by 6.7 per cent (±0.1 per cent). To the authors' knowledge the current method is the most accurate non-invasive means of locating the lumbosacral junction and may be useful for constructing biomechanical models.",
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    Predicting the lumbosacral joint centre location from palpable anatomical landmarks. / Murphy, Andrew James; Bull, A.M.J.; McGregor, A.H.

    In: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine , Vol. 225, No. 11, 11.2011, p. 1082-1087.

    Research output: Contribution to journalArticle

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