How Osmo-Viscoelastic Coupling Affects Recovery of Cyclically Compressed Intervertebral Disc

Spine
Faten FekiFahed Zaïri

Abstract

Osmo-viscoelastic behavior of cyclically loaded cervical intervertebral disc. Evaluate in-vitro the effects of physiologic compressive cyclic loading on the viscoelastic properties of cervical intervertebral disc and, examine how the osmo-viscoelastic coupling affects time-dependent recovery of these properties following a long period of unloading. The human neck supports repetitive loadings during daily activities and recovery of disc mechanics is essential for normal mechanical function. However, the response of cervical intervertebral disc to cyclic loading is still not very well defined. Moreover, how loading history conditions could affect the time-dependent recovery is still unclear. Ten thousand cycles of compressive loading, with different magnitudes and saline concentrations of the surrounding fluid bath, are applied to eight motion segments (composed by two adjacent vertebrae and the intervening disc) extracted from the cervical spines of mature sheep. Subsequently, specimens are hydrated during 18-hours of unloading. The viscoelastic disc responses, after cyclic loading and recovery phase, are characterized by relaxation tests. Viscoelastic behaviors are significantly altered following large number of cyclic loads. M...Continue Reading

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