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Mining Publication: An Exploratory Study of Loading and Morphometric Factors Associated with Specific Failure Modes in Fatigue Testing of Lumbar Motion Segments

March 2006

Image of publication An Exploratory Study of Loading and Morphometric Factors Associated with Specific Failure Modes in Fatigue Testing of Lumbar Motion Segments

There is currently little information regarding factors associated with specific modes of motion segment failure using a fatigue failure model. Thirty-six human lumbar motion segments were fatigue tested using spinal compressive and shear loads that simulated lifting a 9-kg weight in three torso flexion angles (0, 22.5, and 45 deg). Twenty-five segments failed via fatigue prior to the 10,000 cycle maximum. These specimens were visually inspected and dissected so that the mode(s) of failure could be determined. Failure modes included endplate fractures (classified into nine varieties), vertebral body fractures, and/or zygapophysial joint disruption. Logistic regression analyses were performed to determine whether certain morphometric variables, amount of motion segment flexion, disk degeneration scores, and/or loading characteristics were associated with the occurrence of specific failure modes. Results indicated that stellate endplate fractures were associated with increased posterior shear forces (P<0.05) and="" less="" degenerated="" discs=""><0.01). fractures="" running="" laterally="" across="" the="" endplate="" were="" associated="" with="" motion="" segments="" having="" larger="" volumes=""><0.01). endplate="" depression="" was="" more="" common="" in="" smaller="" specimens=""><0.01), as="" well="" as="" those="" experiencing="" increased="" posterior="" shear="" force=""><0.05). zygapophysial="" joint="" damage="" was="" more="" likely="" to="" occur="" in="" a="" neutral="" posture=""><0.01). these="" results="" suggest="" that="" prediction="" of="" failure="" modes="" (e.g.,="" specific="" endplate="" fracture="" patterns)="" may="" be="" possible="" (at="" least="" for="" older="" specimens)="" given="" knowledge="" of="" the="" spinal="" loads="" along="" with="" certain="" characteristics="" of="" the="" lumbar="">

Authors: S Gallagher, WS Marras, AS Litsky, D Burr

Peer Reviewed Journal ArticleMarch - 2006

  • Adobe Acrobat - Portable Document Format (.PDF)

    0.16 MB

NIOSHTIC2 Number: 20029379

Clin Biomech 2006 Mar 21(3):228-234

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