Assessing bone quality through mechanical properties in postmenopausal trabecular bone. (September 2018)

• Record Type: Journal Article
• Authors: Toledano, Manuel; Toledano-Osorio, Manuel; Guerado, Enrique; Caso, Enrique; Osorio, Estrella; Osorio, Raquel
• Is Part Of: Injury. Volume 49(2018)Supplement 2
• Page Start: S3
• Page End: S10
• Publication Date: 2018-09
• Subjects: Trabecular bone -- Static -- Dynamic -- Mechanic -- Menopause; Wounds and injuries -- Surgery -- Periodicals; Accidents -- Periodicals; Wounds and Injuries -- surgery -- Periodicals; Lésions et blessures -- Chirurgie -- Périodiques; Electronic journals; Electronic journals; 617.1
• DOI: 10.1016/j.injury.2018.07.035
• Languages: English
• ISSNs: 0020-1383

Abstract

Abstract: Background: The inner structure of trabecular bone is a result of structural optimization provided by remodeling processes. Changes in hormonal status related to menopause cause bone tissue loss and micro-architectural deterioration with a consequent susceptibility to fracture. Accumulation of micro-damage in bone, as a function of the rate of production and rate of repair, underlies the development of stress fractures, increasing fragility associated to age and osteoporosis, especially in transmenopausal women. Patients and Methods: Quasi-static and nano-dynamic mechanical characterization were undertaken in trabecular bone from femoral neck biopsies of postmenopausal women. AFM (Atomic Force Microscopy) complementary studies were performed to determine nano-roughness (SRa) and the fibrils width of collagen. Nanoindentations were used to quantify transmenopausal changes in intrinsic mechanical properties of trabecular bone: hardness (Hi), modulus of Young (Ei), complex modulus (E*), tan delta ( δ ), storage modulus ( E' ) and loss modulus ( E" ). Results: As result of the quasi-static measurements, 0.149 (0.036) GPa and 2.95 (0.73) GPa of Hi and Ei were obtained, respectively. As result of the nano-dynamic measurements, 17.94 (3.15), 0.62 (0.10), 13.79 (3.21 and 6.39 (1.28) GPa of E*, tan ( δ ), E' and E" were achieved, respectively. 101.07 SRa and 831.28 nm of fibrils width were additionally obtained. Conclusions: This study poses a first approach to the measurement of bone quality in postmenopausal trabecular bone by combining quasi-static, nano-DMA analysis and tribology of dentin surface through AFM characterization.