High cycle fatigue behaviour of functional spinal units.
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High cycle fatigue behaviour of functional spinal units. / Huber, Gerd; Skrzypiec, Daniel M; Klein, Anke; Püschel, Klaus; Morlock, Michael M.
in: IND HEALTH, Jahrgang 48, Nr. 5, 5, 2010, S. 550-556.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - High cycle fatigue behaviour of functional spinal units.
AU - Huber, Gerd
AU - Skrzypiec, Daniel M
AU - Klein, Anke
AU - Püschel, Klaus
AU - Morlock, Michael M
PY - 2010
Y1 - 2010
N2 - Vibrations have been shown to be an important risk factor for spinal pathologies. The underlying mechanisms are poorly understood and in vivo data scarce and difficult to obtain. Consequently numerical models are used to estimate spinal loading; requiring fatigue strength information, which was obtained in this study for spinal specimens from young and old male donors of working age in vitro. Bone mineral density (BMD) and endplate area were determined using CT scans. Three groups were investigated: young specimens in neutral posture, young in flexed posture, and old in neutral posture. The loading consisted of 300,000 sinusoidal compression cycles of 2 kN, inducing a nucleus pressure peek of approximately 1.4 MPa. No failure of the young specimens in neutral posture was observed, but four specimens from older donors with low BMD failed. The product between endplate area and BMD was shown to be useful to predict fatigue strength for old donors and should therefore be considered with regard to whole body vibration injuries. In flexed posture, two specimens from young donors failed. One failure can be attributed to low BMD following the trend for the old specimens; the other failure could not be explained, leaving the influence of flexion yet unclear.
AB - Vibrations have been shown to be an important risk factor for spinal pathologies. The underlying mechanisms are poorly understood and in vivo data scarce and difficult to obtain. Consequently numerical models are used to estimate spinal loading; requiring fatigue strength information, which was obtained in this study for spinal specimens from young and old male donors of working age in vitro. Bone mineral density (BMD) and endplate area were determined using CT scans. Three groups were investigated: young specimens in neutral posture, young in flexed posture, and old in neutral posture. The loading consisted of 300,000 sinusoidal compression cycles of 2 kN, inducing a nucleus pressure peek of approximately 1.4 MPa. No failure of the young specimens in neutral posture was observed, but four specimens from older donors with low BMD failed. The product between endplate area and BMD was shown to be useful to predict fatigue strength for old donors and should therefore be considered with regard to whole body vibration injuries. In flexed posture, two specimens from young donors failed. One failure can be attributed to low BMD following the trend for the old specimens; the other failure could not be explained, leaving the influence of flexion yet unclear.
KW - Adult
KW - Humans
KW - Male
KW - Middle Aged
KW - Young Adult
KW - Age Factors
KW - Models, Biological
KW - histology
KW - Bone Density
KW - Fatigue etiology
KW - Lumbar Vertebrae physiopathology
KW - Pressure adverse effects
KW - Spinal Injuries etiology
KW - Spine anatomy
KW - Vibration adverse effects
KW - Weight-Bearing physiology
KW - Adult
KW - Humans
KW - Male
KW - Middle Aged
KW - Young Adult
KW - Age Factors
KW - Models, Biological
KW - histology
KW - Bone Density
KW - Fatigue etiology
KW - Lumbar Vertebrae physiopathology
KW - Pressure adverse effects
KW - Spinal Injuries etiology
KW - Spine anatomy
KW - Vibration adverse effects
KW - Weight-Bearing physiology
M3 - SCORING: Zeitschriftenaufsatz
VL - 48
SP - 550
EP - 556
JO - IND HEALTH
JF - IND HEALTH
SN - 0019-8366
IS - 5
M1 - 5
ER -
