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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
Keywords: Back Fractures Injuries Lifting or lowering
Original creation date: March 2006
Authors: S Gallagher, WS Marras, AS Litsky, D Burr
Peer Reviewed Journal Article - March 2006
Download PDF Document (0.16 MB)
NIOSHTIC2 Number: 20029379
Clin Biomech 2006 Mar 21(3):228-234
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 (P<0.01). Fractures running laterally across the endplate were associated with motion segments having larger volumes (P<0.01). Endplate depression was more common in smaller specimens (P<0.01), as well as those experiencing increased posterior shear force (P<0.05). Zygapophysial joint damage was more likely to occur in a neutral posture (P<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 spine.
Image of publication An Exploratory Study of Loading and Morphometric Factors Associated with Specific Failure Modes in Fatigue Testing of Lumbar Motion SegmentsPeer Reviewed Journal Article - March 2006
Download PDF Document (0.16 MB)
NIOSHTIC2 Number: 20029379
Clin Biomech 2006 Mar 21(3):228-234
See Also
Biomechanical Modeling of Asymmetric Lifting Tasks in Constrained Lifting Postures
A Comparison of Fatigue Failure Responses of Old Versus Middle-Aged Lumbar Motion Segments in Simulated Flexed Lifting
Effects of Lifting in Four Restricted Postures
Effects of Posture on Back Strength and Lifting Capacity
Effects of Posture on Dynamic Back Loading During a Cable Lifting Task
Nature and Cost of Low Back Pain
Physical Strength Assessment in Ergonomics
Potential of Roof Screening to Reduce Workers' Compensation Cost
Technology News 521 - Development of a Mobile Manipulator to Reduce Lifting Accidents
Torso Flexion Loads and Fatigue Failure Mode of Human Lumbosacral Motion Segments
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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