Sexually dimorphic tibia shape is linked to natural osteoarthritis in STR/Ort mice
de Souza, R.
Pitsillides, A. A.
Objectives:Human osteoarthritis (OA) is detected only at late stages. Male STR/Ort mice develop knee OAspontaneously with known longitudinal trajectory, offering scope to identify OA predisposing factors. Weexploit the lack of overt OA in female STR/Ort and in both sexes of parental, control CBA mice to explorewhether early divergence in tibial bone mass or shape are linked to emergent OA.Method:We undertook detailed micro-CT comparisons of trabecular and cortical bone, multiple struc-tural/architectural parameters andfinite element modelling (FEM) of the tibia from male and female STR/Ort and CBA mice at 8e10 (pre-OA), 18e20 (OA onset) and 40þweeks (advanced OA) of age.Results:We found higher trabecular bone mass in female STR/Ort than in either OA-prone male STR/Ortor non-prone CBA mice. Cortical bone, as expected, showed greater cross-sectional area in male thanfemale CBA, which surprisingly was reversed in STR/Ort mice. STR/Ort also exhibited higher cortical bonemass than CBA mice. Our analyses revealed similar tibial ellipticity, yet greater predicted resistance totorsion in male than female CBA mice. In contrast, male STR/Ort exhibited greater ellipticity than bothfemale STR/Ort and CBA mice at specific cortical sites. Longitudinal analysis revealed greater tibia cur-vature and shape deviations in male STR/Ort mice that coincided with onset and were more pronouncedin late OA.Conclusion:Generalised higher bone mass in STR/Ort mice is more marked in non OA-prone females, butpre-OA divergence in bone shape is restricted to male STR/Ort mice in which OA develops spontaneously.
619 - Veterinary science
Is part of
Osteoarthritis and Cartilage
Javaheri, B., H. Razi, M. Piles, R. de Souza, Y.-M. Chang, I. Maric-Mur, M. Hopkinson, P.D. Lee, and A.A. Pitsillides. 2018. "Sexually Dimorphic Tibia Shape Is Linked To Natural Osteoarthritis In STR/Ort Mice". Osteoarthritis And Cartilage 26 (6): 807-817. Elsevier BV. doi:10.1016/j.joca.2018.03.008.
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