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Changes in growth plate extracellular matrix composition and biomechanics following in vitro static versus dynamic mechanical modulation.
Journal of Musculoskeletal & Neuronal Interactions 2018 March 2
The objective of this study was to investigate the effects of mechanical modulation parameters on structural proteins biocomposition and mechanical properties of the growth plate. Establishing these parameters is a crucial step in the development of fusionless treatment of scoliosis. In this study, ulna explants from 4-weeks-old (pubertal) swines were used. The biocomposition was characterized using biochemical content evaluation and immunohistochemistry. Mechanical properties were characterized by fitting the data of the stress relaxation curves using a fibril reinforced biphasic model. For the mechanical loading, one static modulation condition and three different dynamic modulation conditions, with similar average stress but different amplitude and frequency values, were performed using a bioreactor. Results showed that static loading triggers a decrease in proteoglycan content and type X collagen in specific zones of the growth plate. These changes can be associated with the observed decrement of permeability in the static group. None of the three conditions evaluated for dynamic modulation affected the growth plate biocomposition and biomechanical responses. Results of this study provides an improved understanding of growth plate responses to mechanical environment, which will be useful in finding the optimal and non-damaging parameters for fusionless treatments based on the mechanical modulation of bone growth.
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