Abstract
The objectives of this study were to extract the intrinsic mechanical properties of the growth plate at four different stages of growth and to compare two different methods of extracting these properties. Porcine distal ulnar growth plate samples were obtained from newborn, 4-, 8-, and 18-week (W) pigs and were tested using stress relaxation tests under unconfined compression. A four-parameter curve fitting procedure was developed to extract mechanical properties using the Transversely Isotropic Biphasic Elastic model(TIBPE) (Cohen et al. in J Biomech Eng Trans Asme 120(4):491–496, 1998) and the Differential Evolution (DE) optimization algorithm (Price et al. Natural computing series, Springer, Germany 2005). Optimization was done on all experimental curves for the first method and on one average experimental curve per developmental stage in the second. The 4-week stage was studied in two subgroups (a) and (b) due to distinct differences in mechanical properties. Intrinsic mechanical properties of the growth plate varied nonlinearly with developmental stage. Both methods showed that transverse and out-of-plane Young’s moduli (E 1, E 3) decrease with developmental stage, whereas transverse permeability (k 1) increases. The exception is a sharp increase in stiffness and reduction in permeability at the 4W(a) stage, which may be associated with rapid porcine developmental changes at the 3–4 week period. The second method provides a more reliable representation of the average mechanical behavior, whereas the first method allows statistical comparison of optimized mechanical properties. This study characterizes, for the first time, the variation in growth plate mechanical properties for the same animal (porcine) and bone (ulna) model with developmental stage and provides new insight into the progression of musculoskeletal diseases during growth spurts in response to mechanical loading.
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Abbreviations
- E 1 :
-
Transverse Young’s modulus
- E 3 :
-
Out-of-plane Young’s modulus
- k 1 :
-
Transverse permeability
- ν 21 :
-
Transverse Poisson’s ratio
- ν 31 :
-
Out-of-plane Poisson’s ratio
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Wosu, R., Sergerie, K., Lévesque, M. et al. Mechanical properties of the porcine growth plate vary with developmental stage. Biomech Model Mechanobiol 11, 303–312 (2012). https://doi.org/10.1007/s10237-011-0310-6
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DOI: https://doi.org/10.1007/s10237-011-0310-6