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- Title
Intradiscal pressure depends on recent loading and correlates with disc height and compressive stiffness.
- Authors
Vergroesen, Pieter-Paul; Veen, Albert; Royen, Barend; Kingma, Idsart; Smit, Theo
- Abstract
Purpose: Intervertebral discs exhibit time-dependent deformation (creep), which could influence the relation between applied stress and intradiscal pressure. This study investigates the effect of prolonged dynamic loading on intradiscal pressure, disc height and compressive stiffness, and examines their mutual relationships. Methods: Fifteen caprine lumbar discs with 5 mm of vertebral bone on either side were compressed by 1 Hz sinusoidal load for 4.5 h. After preload, 'High' (130 ± 20 N) or 'Low' (50 ± 10 N) loads were alternated every half hour. Continuous intradiscal pressure measurement was performed with a pressure transducer needle. Results: Each disc showed a linear relationship between axial compression and intradiscal pressure ( R > 0.91). The intercept of linear regression analysis declined over time, but the gradient remained constant. Disc height changes were correlated to intradiscal pressure changes ( R > 0.98): both decreased during High loading, and increased during Low loading. In contrast, compressive stiffness increased during High loading, and was inversely related to intradiscal pressure and disc height. Conclusions: Intradiscal pressure is influenced by recent loading due to fluid flow. The correlations found in this study suggest that intradiscal pressure is important for disc height and axial compliance. These findings are relevant for mechanobiology studies, nucleus replacements, finite element models, and ex vivo organ culture systems.
- Subjects
INTERVERTEBRAL disk diseases; INTERVERTEBRAL disk abnormalities; INTERVERTEBRAL disk displacement; BIOMECHANICS research; INTERVERTEBRAL disk prostheses; HYDROSTATIC pressure; PATIENTS; THERAPEUTICS
- Publication
European Spine Journal, 2014, Vol 23, Issue 11, p2359
- ISSN
0940-6719
- Publication type
Article
- DOI
10.1007/s00586-014-3450-4