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• W2056755635 abstract "In Brief Study Design. An in vitro biomechanics investigation exposing porcine functional spinal units (FSUs) to submaximal cyclic or static compressive forces while in a flexed, neutral, or extended posture. Objective. To investigate the combined effect of cyclically applied compressive force (e.g., vibration) and postural deviation on intervertebral joint mechanics. Summary of Background Data. Independently, prolonged vibration exposure and non-neutral postures are known risk factors for development of low back pain and injury. However, there is limited basic scientific evidence to explain how the risk of low back injury from vibration exposure is modified by other mechanical factors. This work examined the influence of static postural deviation on vertebral joint height loss and compressive stiffness under cyclically applied compressive force. Methods. Forty-eight FSUs, consisting of 2 adjacent vertebrae, ligaments, and the intervening intervertebral disc were included in the study. Each specimen was randomized to 1 of 3 experimental posture conditions (neutral, flexed, or extended) and assigned to 1 of 2 loading protocols, consisting of (1) cyclic (1500 ± 1200 N applied at 5 Hz using a sinusoidal waveform, resulting in 0.2 g rms acceleration) or (2) 1500 N of static compressive force. Results. As expected, FSU height loss followed a typical first-order response in both the static and cyclic loading protocols, with the majority (∼50%) of the loss occurring in the first 20 minutes of testing. A significant interaction between posture and loading protocol (P < 0.001) was noted in the magnitude of FSU height loss. Subsequent analysis of simple effects revealed significant differences between cyclic and static loading protocols in both a neutral (P = 0.016) and a flexed posture (P < 0.0001). No significant differences (P = 0.320) were noted between pre/postmeasurements of FSU compressive stiffness. Conclusion. Posture is an important mechanical factor to consider when assessing the risk of injury from cyclic loading to the lumbar spine. When exposed to prolonged cyclic compressive loading, porcine vertebral joints experienced significantly greater height loss while in a flexed posture than in neutral or extended postures. These findings suggest that posture requires consideration as a mechanically influential factor when assessing the low back injury risk imposed from vibration." @default.
• W2056755635 created "2016-06-24" @default.
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• W2056755635 date "2012-08-01" @default.
• W2056755635 modified "2023-10-14" @default.
• W2056755635 title "The Impact of Posture and Prolonged Cyclic Compressive Loading on Vertebral Joint Mechanics" @default.
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• W2056755635 doi "https://doi.org/10.1097/brs.0b013e318256f9e6" @default.
• W2056755635 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22472807" @default.
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