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Deng X.-G.,Sichuan Provincial Orthopedics Hospital | Chen J.-T.,Southern Medical University | Feng Y.,Jinggangshan University
Journal of Clinical Rehabilitative Tissue Engineering Research | Year: 2010

BACKGROUND: Whole body vibration which is used to prevent and treat osteoporosis recently is uncomfortable due to its strong vibration strength. The designed compound vibration with low vibration strength could effectively prevent bone quality decrease of ovariectomized rats. OBJECTIVE: To verify the effect of compound vibration with low vibration strength on the bone quality of ovariectomized rats. METHODS: A total of 32 4-month-old female SD rats were used in this study. All SD rats were randomly divided into 4 groups: normal control group, ovariectomized control group, vibration I group (45 Hz-55 Hz, 0.05 g-0.1 g), and vibration II group (45 Hz-55 Hz, 0.12 g-0.21 g), with 8 rats for each group. The intervention to each vibration group was one a day, 20 minutes/times, and 5 days per week. The resting interval was shorted than 2 days, and the whole vibration intervention lasted 13 weeks. Bone mineral density (BMD) before and after vibration, ex vivo bone microstructure parameters and biomechanics parameters were measured in this study. RESULTS AND CONCLUSION: Lumbar BMD of ovariectomized control group was decreased (P < 0.05), but the BMD in the normal control group and the two vibration groups was increased significantly. Femoral BMD of all groups was increased, but there was no significant difference among the four groups. Bone microstructure parameters of the three ovariectomized groups were decreased; however, parameters including number, thickness and distance of bone trabecula and bone volume fraction in the vibration II group were significantly improved compared to ovariectomized control group. Moreover, bone strength of lumbar vertebra in the two vibration groups was significantly increased (P=0.025, 0.006), but there was no significant difference compared to normal control group. Compound vibration with low strength could effectively prevent BMD decrease of ovariectomized rats, lighten the degree of bone microstructure damage, keep bone strength, improve bone quality of ovariectomized rats, and potentially prevent osteoporosis. Source


Tao Z.-S.,Wenzhou University | Zhou W.-S.,Guizhou University | Qiang Z.,Wenzhou University | Tu K.-K.,Wenzhou University | And 6 more authors.
Journal of Biomaterials Applications | Year: 2016

Previous studies have demonstrated the effect of human parathyroid hormone (1-34) (PTH) or strontium-doped hydroxyapatite coating (Sr-HA) on osteoporotic bone implantation. However, reports about effects of PTH plus Sr-HA on bone osseointegration of titanium implants in a state of osteoporosis were limited. This study was designed to investigate the effects of intermittent administration of human parathyroid hormone (1-34) on strontium-doped hydroxyapatite coating (Sr-HA) implant fixation in ovariectomized (OVX) rats. Twelve weeks after bilateral ovariectomy, all animals were randomly divided into four groups including control group, Sr group, PTH group and PTH+Sr group. Forty OVX rats accepted implant insertion in the distal femurs, control group, and PTH group with HA implants and the Sr group and PTH+Sr group with Sr-HA implants. Animals from PTH group and PTH+Sr group then randomly received PTH (60 μg/kg, 3 times a week) until death at 12 weeks. After 12-week healing period, implants from group PTH+Sr revealed improved osseointegration compared with other treatment groups, which is manifested by the exceeding increase of bone area ratio and bone-to-implant contact, the trabecular microarchitecture and the maximal push-out force displayed by tests like histomorphometry, micro-CT, and biomechanics evaluation. These results demonstrated that PTH+ Sr-HA coatings could enhance implant osseointegration in OVX rats, and suggested the feasibility of using this method to improve implant fixation in osteoporotic bone. © 2015 The Author(s). Source


Tao Z.-S.,Wenzhou University | Zhou W.-S.,Guizhou University | He X.-W.,Hangzhou Bay Hospital of Ningbo | Liu W.,Jingmen No. 1 Peoples Hospital | And 9 more authors.
Materials Science and Engineering C | Year: 2016

Surface modification techniques have been applied to generate titanium implant surfaces that promote osseointegration for the implants in cementless arthroplasty. However, its effect is not sufficient for osteoporotic bone. Zinc (Zn), magnesium (Mg), and strontium (Sr) present a beneficial effect on bone growth, and positively affect bone regeneration. The aim of this study was to confirm the different effects of the fixation strength of Zn, Mg, Sr-substituted hydroxyapatite-coated (Zn-HA-coated, Mg-HA-coated, Sr-HA-coated) titanium implants via electrochemical deposition in the osteoporotic condition. Female Sprague-Dawley rats were used for this study. Twelve weeks after bilateral ovariectomy, all animals were randomly divided into four groups: group HA; group Zn-HA; group Mg-HA and group Sr-HA. Afterwards, all rats from groups HA, Zn-HA, Mg-HA and Sr-HA received implants with hydroxyapatite containing 0%, 10% Zn ions, 10% Mg ions, and 10% Sr ions. Implants were inserted bilaterally in all animals until death at 12 weeks. The bilateral femurs of rats were harvested for evaluation. All treatment groups increased new bone formation around the surface of titanium rods and push-out force; group Sr-HA showed the strongest effects on new bone formation and biomechanical strength. Additionally, there are significant differences in bone formation and push-out force was observed between groups Zn-HA and Mg-HA. This finding suggests that Zn, Mg, Sr-substituted hydroxyapatite coatings can improve implant osseointegration, and the 10% Sr coating exhibited the best properties for implant osseointegration among the tested coatings in osteoporosis rats. © 2016 Elsevier B.V. All rights reserved. Source


Tao Z.-S.,Wenzhou University | Tu K.-K.,Wenzhou University | Huang Z.-L.,Wenzhou University | Zhou Q.,Wenzhou University | And 6 more authors.
Medical and Biological Engineering and Computing | Year: 2015

The objective of this study was to evaluate the effect of following combined treatment with parathyroid hormone (1–34) (PTH) and beta-tricalcium phosphate (β-TCP) on local bone formation in a rat 3-mm critical-size defect at distal femur. Twelve weeks after bilateral ovariectomy (OVX) and sham operation (sham), all animals were randomly divided into four groups: group OVX, group OVX + β-TCP, group sham, and group sham + β-TCP, then all rats underwent bone defect in the bilateral distal femurs, and β-TCP were implanted into critical-sized defects for group OVX + β-TCP and group sham + β-TCP. After defect operation, all animals were received following subcutaneous injections with PTH (60 μg/kg, three times a week) until death at 4 and 8 weeks. The defected area in distal femurs of rats was harvested for evaluation by histology, micro-CT, and biomechanics. The results of our study show that systemic usage of PTH or local usage of β-TCP can increase the healing of defects in OVX or sham rats. Furthermore, treatments with PTH and β-TCP showed a stronger effect on accelerating the local bone formation than used alone. Osteoporosis can limit the function of PTH and/or β-TCP. The results from our study demonstrate that combination of PTH and β-TCP had an additive effect on local bone formation in non-osteoporosis and/or osteoporosis rats. © 2015 International Federation for Medical and Biological Engineering Source


Tao Z.-S.,Wenzhou University | Zhou W.-S.,Guizhou University | Tu K.-K.,Wenzhou University | Huang Z.-L.,Wenzhou University | And 5 more authors.
Journal of Cranio-Maxillofacial Surgery | Year: 2015

The objective of this study was to evaluate the effect of following combined treatment with parathyroid hormone (1-34) (PTH) and β-tricalcium phosphate (β-TCP) on local bone formation in a rat 3-mm critical-sized defect at the distal femur. Fourteen weeks were allowed to pass before defect surgery for the establishment of osteopenic animal models chronically fed a low-protein diet. All animals were randomly divided into four groups: group PTH; group β-TCP, group PTH + β-TCP, and a control group. All rats then underwent a surgical procedure to create bone defects in the bilateral distal femurs, and β-TCP was implanted into critical-sized defects for the groups designated as β-TCP and group PTH + β-TCP. After the defect operation, all animals from group PTH and group PTH + β-TCP received following subcutaneous injections with PTH (60 μg/kg, three times per week) until euthanasia at 4 and 8 weeks. The distal femurs and blood were collected for evaluation. The results of study showed the strongest effect on accelerating the local bone formation with treatment β-TCP and PTH at 4 weeks and 8 weeks. The results from our study demonstrate that a combination of PTH and β-TCP had an additive effect on local bone formation in osteopenic rats chronically fed a low-protein diet. © 2015 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved. Source

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