Rat Tibia Research Articles

Evaluation of the Effects of Systemic Irisin Application on Guided Bone Regeneration in Peri-implant Bone Defects.

This study aimed to investigate the effects of systemic irisin hormone application on new bone formation in peri-implant bone defects. After surgically creating peri-implant bone defects in the metaphyseal part of the tibiae of rats, the rats were randomly divided into 2 equal groups: a control group and an irisin group. In the control group, the rats received no further treatment during the 4-week experimental period after the surgery. The rats in the irisin group, 100ng/kg irisin was administered intraperitoneally 3 days a week during the 8 weeks experimental period after the surgery. At the end of the experimental period, the rats were euthanized. Implants and surrounding bone tissues were collected for histological new bone formation analysis. The Student t test was used for statistical analysis. There were no significant differences between the groups in the histological analysis, new bone formation and fibrosis (P>0.05). Also, in the irisin group, there was numerically but not statistically more new bone formation detected compared with the controls. Within the limitations of this study, irisin did not affect new bone formation in peri-implant defects, although the numerical values favored the irisin group.

In Vivo Evaluation of the Effects of B-Doped Strontium Apatite Nanoparticles Produced by Hydrothermal Method on Bone Repair.

In the present study, the structural, morphological, and in vivo biocompatibility of un-doped and boron (B)-doped strontium apatite (SrAp) nanoparticles were investigated. Biomaterials were fabricated using the hydrothermal process. The structural and morphological characterizations of the fabricated nanoparticles were performed by XRD, FT-IR, FE-SEM, and EDX. Their biocompatibility was investigated by placing them in defects in rat tibiae in vivo. The un-doped and B-doped SrAp nanoparticles were successfully fabricated. The produced nanoparticles were in the shape of nano-rods, and the dimensions of the nano-rods decreased as the B ratio increased. It was observed that the structural and morphological properties of strontium apatite nanoparticles were affected by the contribution of B. A stoichiometric Sr/P ratio of 1.67 was reached in the 5% B-doped sample (1.68). The average crystallite sizes were 34.94 nm, 39.70 nm, 44.93 nm, and 48.23 nm in un-doped, 1% B-doped, 5% B-doped, and 10% B-doped samples, respectively. The results of the in vivo experiment revealed that the new bone formation and osteoblast density were higher in the groups with SrAp nanoparticles doped with different concentrations of B than in the control group, in which the open defects were untreated. It was observed that this biocompatibility and the new bone formation were especially elevated in the B groups, which added high levels of strontium were added. The osteoblast density was higher in the group in which the strontium element was placed in the opened bone defect compared with the control group. However, although new bone formation was slightly higher in the strontium group than in the control group, the difference was not statistically significant. Furthermore, the strontium group had the highest amount of fibrotic tissue formation. The produced nanoparticles can be used in dental and orthopedic applications as biomaterials.

Immunohistochemical evaluation of autotaxin and lubricin in mild osteoarthritic rat model performing moderate physical activity

Levels of the enzyme autotaxin (ATX) are elevated in synovial fluid and plasma of osteoarthritic patients, correlating positively with radiographic and symptomatic severity of the disease. Therefore, ATX is studied as potential marker for the progression of osteoarthritis (OA), whereas the chondrocyte-secreted glycoprotein Lubricin has chondroprotective properties. The aim of this study was to evaluate the expression of ATX and Lubricin in healthy and mild OA rat articular cartilage of femur, tibia and patella, and to analyse the effect of a protocol of moderate physical activity on their expressions. Mild OA resulted from anterior cruciate ligament transection and rats exercised on a treadmill for 12 weeks. Computerized staining intensity of immunostaining was used to evaluate ATX and Lubricin expressions. Higher expressions of ATX were found in femur and tibia of OA rats, suggesting that this molecule could participate in the progression of the disease, although not involved in the patella. In the femur, physical activity performed by OA rats was able to lower ATX expression, encouraging the evidence that joint movement is beneficial for the cartilage, although no significant differences in Lubricin expression were detected in femur, tibia and patella. This evidence might shade some light about the role of ATX, Lubricin and physical exercise in OA progression.

Crystalline Biomimetic Calcium Phosphate Coating on Mini-Pin Implants to Accelerate Osseointegration and Extend Drug Release Duration for an Orthodontic Application.

Miniscrew implants (MSIs) have been widely used as temporary anchorage devices in orthodontic clinics. However, one of their major limitations is the relatively high failure rate. We hypothesize that a biomimetic calcium phosphate (BioCaP) coating layer on mini-pin implants might be able to accelerate the osseointegration, and can be a carrier for biological agents. A novel mini-pin implant to mimic the MSIs was used. BioCaP (amorphous or crystalline) coatings with or without the presence of bovine serum albumin (BSA) were applied on such implants and inserted in the metaphyseal tibia in rats. The percentage of bone to implant contact (BIC) in histomorphometric analysis was used to evaluate the osteoconductivity of such implants from six different groups (n=6 rats per group): (1) no coating no BSA group, (2) no coating BSA adsorption group, (3) amorphous BioCaP coating group, (4) amorphous BioCaP coating-incorporated BSA group, (5) crystalline BioCaP coating group, and (6) crystalline BioCaP coating-incorporated BSA group. Samples were retrieved 3 days, 1 week, 2 weeks, and 4 weeks post-surgery. The results showed that the crystalline BioCaP coating served as a drug carrier with a sustained release profile. Furthermore, the significant increase in BIC occurred at week 1 in the crystalline coating group, but at week 2 or week 4 in other groups. These findings indicate that the crystalline BioCaP coating can be a promising surface modification to facilitate early osseointegration and increase the success rate of miniscrew implants in orthodontic clinics.

An in silico model for woven bone adaptation to heavy loading conditions in murine tibia.

Existing in silico models for lamellar bone adaptation to mechanical loading are unsuitable for predicting woven bone growth. This anomaly is due to the difference in mechanobiology of the woven bone with respect to that of the lamellar bone. The present study is aimed at developing an in silico bone-adaptation model for woven bone at cellular and tissue levels. The diffusion of Ca2+ ions reaching lining cells from the osteocytic network and the bone cortex in response to a mechanical loading on the cortical bone has been considered as a stimulus. The diffusion of ions within osteocytic network has been computed with a lacunar-canalicular network (LCN) in which bone cells are uniformly arranged. Strain energy density is assumed to regulate ion flow within the network when the induced normal strain is above a threshold level. If the induced strain exceeds another higher threshold level, then the strain with a power constant is additionally assumed to regulate the stimulus. The intracellular flow of Ca2+ ions within the LCN has been simulated using Fick's laws of diffusion, using a finite element method. The ion diffusion from bone cortex to vesicles has been formulated as a normal strain with a power constant. The stimuli reaching the surface cells are assumed to form the new bone. The mathematical model closely predicts woven bone growth in mouse and rat tibia for various in vivo loading conditions. This model is the first to predict woven bone growth at tissue and cellular levels in response to heavy mechanical loading.

The Hydration State of Bone Tissue Affects Contrast in Neutron Tomographic Images.

Neutron tomography has emerged as a promising imaging technique for specific applications in bone research. Neutrons have a strong interaction with hydrogen, which is abundant in biological tissues, and they can penetrate through dense materials such as metallic implants. However, in addition to long imaging times, two factors have led to challenges in running in situ mechanical characterization experiments on bone tissue using neutron tomography: 1) the high water content in specimens reduces the visibility of internal trabecular structures; 2) the mechanical properties of bone are dependent on the hydration state of the tissue, with drying being reported to cause increased stiffness and brittleness. This study investigates the possibility of improving image quality in terms of neutron transmission and contrast between material phases by drying and rehydrating in heavy water. Rat tibiae and trabecular bovine bone plugs were imaged with neutron tomography at different hydration states and mechanical testing of the bone plugs was carried out to assess effects of drying and rehydration on the mechanical properties of bone. From analysis of image histograms, it was found that drying reduced the contrast between bone and soft tissue, but the contrast was restored with rehydration. Contrast-to-noise ratios and line profiles revealed that the contrast between bone tissue and background was reduced with increasing rehydration duration but remained sufficient for identifying internal structures as long as no free liquid was present inside the specimen. The mechanical analysis indicated that the proposed fluid exchange protocol had no adverse effects on the mechanical properties.

Metal Ion Augmented Mussel Inspired Polydopamine Immobilized 3D Printed Osteoconductive Scaffolds for Accelerated Bone Tissue Regeneration

Critical bone defects with a sluggish rate of auto-osteoconduction and imperfect reconstruction are motivators for the development of an alternate innovative approach for the regeneration of bone. Tissue engineering for bone regeneration signifies an advanced way to overcome this problem by creating an additional bone tissue substitute. Among different fabrication techniques, the 3D printing technique is obviously the most efficient and advanced way to fabricate an osteoconductive scaffold with a controlled porous structure. In the current article, the polycarbonate and polyester diol based polyurethane-urea (P12) was synthesized and 3D porous nanohybrid scaffolds (P12/TP-nHA) were fabricated using the 3D printing technique by incorporating the osteoconductive nanomaterial titanium phosphate adorned nanohydroxyapatite (TP-nHA). To improve the bioactivity, the surface of the fabricated scaffolds was modified with the immobilized biomolecule polydopamine (PDA) at room temperature. XPS study as well as the measurement of surface wettability confirmed the higher amount of PDA immobilization on TP-nHA incorporated nanohybrid scaffolds through the dative bone formation between the vacant d orbital of the incorporated titanium ion and the lone pair electron of the catechol group of dopamine. The incorporated titanium phosphate (TP) increased the tensile strength (53.1%) and elongation at break (96.8%) of the nanohybrid composite as compared to pristine P12. Moreover, the TP incorporated nanohybrid scaffold with calcium and phosphate moieties and a higher amount of immobilized active biomolecule improved the in vitro bioactivity, including the cell viability, cell proliferation, and osteogenic gene expression using hMSCs, of the fabricated nanohybrid scaffolds. A rat tibia defect model depicted that the TP incorporated nanohybrid scaffold with immobilized PDA enhanced the in vivo bone regeneration ability compared to the control sample without revealing any organ toxicity signifying the superior osteogenic bioactivity. Thus, a TP augmented polydopamine immobilized polyurethane-urea based nanohybrid 3D printed scaffold with improved physicochemical properties and osteogenic bioactivity could be utilized as an excellent advanced material for bone regeneration substitute.

A Preliminary Study on the Effects of Black Cohosh Preparations on Bone Metabolism of Rat Models With GnRH-a-Induced Peri-Menopausal Symptoms.

A Preliminary Study on the Effects of Black Cohosh Preparations on Bone Metabolism of Rat Models With GnRH-a-Induced Peri-Menopausal Symptoms.

Micro CT assessment of the effect of single and fractionated X radiation doses in rats tibias

The aim of this study was to evaluate the effect of X radiation in single and fractionated doses in tibias of rats by micro-computer tomography (µCT) analysis. The sample was consisted by 20 male rats, divided into 3 groups: Control, Single dose and Fractionated dose. The rats were submitted to a radiation X exposure on lower limbs. The single dose group was exposed to single radiation of 15 gray (Gy), while the fractionated group was submitted to three irradiation sessions of 5 Gy each, totaling 15 Gy. After 24 hours and 25 days, the rats were euthanized; the tibias were removed and scanned using a µCT unit, SkyScan 1174 Compact Micro-CT (Kontich, Bélgica). The parameters total bone area (Tt.Ar) , cortical bone area (Ct.Ar) , total cross-sectional bone area ratio (Ct.Ar / Tt.Ar) e cortical thickness (Ct.Th) for cortical bone, e bone volume ratio (BV / TV), trabecular number (Tb.N), trabecular thickness (Tb.Th) e trabecular separation (Tb.Sp), for trabecular bone analysis were evaluated. Data were submitted to one-way ANOVA and Tukey’s test (α = 0.05). The µCT evaluation showed significant differences on Tt.Ar and Tb.Sp parameters (p<0,05). It was observed a lower Tt.Ar in the fractionated group compared to control, and higher Tb.Sp in the group receiving a single dose when compared to the control and fractionated groups. It is concluded, in relation to bone microarchitecture, that the radiation X in fractionated doses presents more deleterious effects on the cortical bone and when in singe doses, more damage on trabecular spaces, leading to a higher porosity.

Corrosion properties and biocompatibility of strontium doped calcium phosphate coated magnesium prepared by electrodeposition

The initial corrosion resistance and bioactivity of biodegradable magnesium is a major success factor in implant applications. In this study, Calcium phosphate doped Strontium was coated on magnesium by electrodeposition. The surface characteristics and biocompatibility of Calcium phosphate coated magnesium according to the Sr content were evaluated. The strontium-calcium phosphate coating was uniformly coated on the magnesium surface and strontium-calcium phosphate coating layer prevents damage and local corrosion of the magnesium surface. In addition, as the strontium content increased, the corrosion resistance of magnesium was improved. Cytotoxicity was evaluated through an in vitro test using the osteoblasts. Cell proliferation improved with increasing strontium content. Modified magnesium was implantation in rat tibia for 4 weeks and the effect on bone regeneration was confirmed. As a result, bone regeneration of strontium-calcium phosphate coated magnesium was improved. strontium-calcium phosphate coating on magnesium showed improved corrosion resistance, biocompatibility and improved bone regeneration, which may be beneficial for clinical use.

Knockdown of PAR2 alleviates cancer-induced bone pain by inhibiting the activation of astrocytes and the ERK pathway

ObjectiveCancer-induced bone pain (CIBP) is a kind of pain with complex pathophysiology. Proteinase-activated receptor 2 (PAR-2) is involved in CIBP. This study explored the effects of PAR-2 on CIBP rats.MethodsCIBP rat model was established by injecting Walker 256 rat breast cancer cells into the left tibia of female Sprague-Dawley rats and verified by tibial morphology observation, HE staining, and mechanical hyperalgesia assay. CIBP rats were injected with PAR-2 inhibitor, ERK activator, and CREB inhibitor through the spinal cord sheath on the 13th day after operation. CIBP behaviors were measured by mechanical hyperalgesia assay. On the 14th day after operation, L4-5 spinal cord tissues were obtained. PAR-2 expression, co-expression of PAR-2 and astrocyte marker GFAP, GFAP mRNA and protein levels and the ERK pathway-related protein levels were detected by Western blot, immunofluorescence double staining, RT-qPCR, and Western blot.ResultsCIBP rats had obvious mechanical hyperalgesia and thermal hyperalgesia from the 7th day after modeling; mechanical hyperalgesia threshold and thermal threshold were decreased; PAR-2 was increased in spinal cord tissues and was co-expressed with GFAP. PAR-2 silencing alleviated rat CIBP by inhibiting astrocyte activation. p-ERK/t-ERK and p-CREB/t-CREB levels in CIBP spinal cord were elevated, the ERK/CREB pathway was activated, while the ERK/CREB pathway was inhibited by PAR-2 silencing. The alleviating effect of PAR-2 inhibitor on hyperalgesia behaviors in CIBP rats were weakened by ERK activator, while were partially restored by CREB inhibitor.ConclusionsPAR-2 knockdown inhibited the ERK/CREB pathway activation and astrocyte activation, thus alleviating CIBP in rats.

Inorganic nanomaterial-reinforced hydrogel membrane as an artificial periosteum

Repairing large bone defects remains challenging with the major risks of delayed union or even non-union. From the perspective of bone development and clinical experience, the periosteum is critical for protection, vascularization, neomineralization, and of note plays an indispensable role in bone reconstruction and regeneration. On the other hand, many artificial periosteums were designed solely for protection and lacked the functional capacity for osteogenesis and angiogenesis. In this work, we designed an inorganic nanomaterials-reinforced gelatin hydrogel membrane as an artificial periosteum using an organic and inorganic co-cross-linked approach for improving the durable angiogenesis and osteogenesis in bone repairing. Bioactive strontium (Sr) and/or iron (Fe) substituted hydroxyapatite (HAp) nanomaterials chemically surface-decorated with photo-cross-linkable gelatin methacrylate (GelMA) were subsequently blended into GelMA solution to develop an organic/inorganic co-cross-linked hydrogel membrane. These co-cross-linked hydrogel membranes/scaffolds confirmed the improved mechanical property, prolonged degradation life, stable pH value, better biomineralization, and steady ion release associated with evenly dispersed Sr and/or Fe substituted HAp nanomaterials into the GelMA hydrogel. In vitro experiments evaluation proved that when compared with the single cross-linked GelMA-Sr/Fe:HAp scaffold, the co-cross-linked GelMA-MSr/Fe:HAp membrane greatly enhanced osteogenic differentiation including alkaline phosphatase activity and production of matrix mineralization while retaining the stable pH value of the local environment, which was conducive to cell viability, proliferation, and adhesion. Furthermore, GelMA-MSr/Fe:HAp membrane is defined as a superior artificial periosteum with high capacity in osteogenesis and angiogenesis for promoting fresh and mature lamellar bone development in Sprague Dawley rat tibia defects. This organic/inorganic strengthening structure of co-cross-linked hydrogel membrane could be implied a promising approach for forming of advanced and new periosteum biomaterials with excellent handling and remarkable bone reconstruction properties.

Nanocomposite Hydrogel Produced from PEGDA and Laponite for Bone Regeneration.

Herein, a nanocomposite hydrogel was produced using laponite and polyethylene-glycol diacrylate (PEGDA), with or without Irgacure (IG), for application in bone tissue regeneration. The nanocomposites were characterized by X-ray diffraction (XRD), Fourier-Transform infrared spectroscopy (FTIR), and thermal analysis (TG/DTG). The XRD results showed that the crystallographic structure of laponite was preserved in the nanocomposite hydrogels after the incorporation of PEGDA and IG. The FTIR results indicated that PEGDA polymer chains were entangled on laponite in hydrogels. The TG/DTG found that the presence of laponite (Lap) improved the thermal stability of nanocomposite hydrogel. The toxicity tests by Artemia salina indicated that the nanocomposite hydrogels were not toxic, because the amount of live nauplii was 80.0%. In addition, in vivo tests demonstrated that the hydrogels had the ability to regenerate bone in a bone defect model of the tibiae of osteopenic rats. For the nanocomposite hydrogel (PEGDA + Lap nanocomposites + UV light), the formation of intramembranous bone in the soft callus was more intense in 66.7% of the animals. Thus, the results presented in this study evidence that nanocomposite hydrogels obtained from laponite and PEGDA have the potential for use in bone regeneration.

Strength features of the tibia in diabetic rats after repeated fracture

Strength features of the tibia in diabetic rats after repeated fracture

Comparison of osseointegration in areas grafted with deproteinized bovine bone and native bone. A preclinical study.

The aim of this study was to evaluate the osseointegration of implants placed in rat tibia sites grafted with Deproteinized Bovine Bone (DBB) and Native Bone (NB). Twenty-eight rats were divided into two groups according to the type of substrate in which the implants were to be placed: NB - implants placed in native bone; DBB - implants placed in areas grafted with DBB. In the DBB group, the bone defect was made and filled with the bone substitute 60 days before placing the implant. The animals were euthanized 15 or 45 days after implant placement. Osseointegration was assessed by the removal torque, volume of mineralized tissues around the implants (BV/TV), bone-implant contact (%BIC), and bone between threads (%BBT). The implants placed in NB presented higher removal torque (8.00 ± 1.26 Ncm vs. 2.33 ± 0.41 Ncm at 15 days and 22.00 ± 2.44 Ncm vs. 4.00 ± 1.41 Ncm at 45 days), higher %BV/TV (47.92 ± 1.54% vs. 33.33 ± 4.77% at 15 days and 70.06 ± 0.91% vs. 39.89±5.90%at 45 days), higher %BIC (39.68 ± 5.02% vs. 9.12 ± 5.56% at 15 days and 83.23 ± 4.42% vs. 18.81 ± 7.21% at 45 days), and higher %BBT (34.33 ± 5.42% vs. 13.24 ± 8.72% at 15 days and 82.33 ± 3.13% vs. 22.26 ± 8.27% at 45 days) than the implants placed in DBB grafted areas. The degree of osseointegration was lower in implants placed in the area grafted with DBB than in NB in rat tibias.

Preventing Ischemic-Reperfusion Injury after Tourniquet Application in Fracture using Aloe vera Ethanolic Extract

Introduction: A tourniquet is a typical equipment used in the orthopedics surgery to decrease blood loss and create a better operating environment. Ischemic-reperfusion damage, which happens when the tourniquet is deflated, is one of the tourniquet's negative effects. Antioxidants can be used to minimize oxidative stress, which is one strategy to mitigate ischemic-reperfusion injury. Aloe vera, for example, is widely known for its antioxidant and anti-inflammatory properties.
 Method: The tibias of male Wistar strain rats (Rattus norvegicus) were fractured in this experiment, and Aloe vera gel was given orally as an antioxidant. A total of 18 rats were utilized in this research, which were separated into 6 groups. Varying amounts of Aloe vera extract were given to the treatment groups: 40 mg/kgBW, 60 mg/kgBW, and 80 mg/kgBW. The tourniquet would be inflated for two hours then deflated after application of the Aloe vera extract. Superoxide dismutase (SOD) and malondialdehyde levels were measured in the tibia (MDA).
 Result: Application of tourniquet increased oxidative stress marker in fracture state, marked by reduction of SOD and increase of MDA. After administration of Aloe vera extract, the oxidative stress parameters (SOD and MDA) were reduced significantly.
 Conclusion: The result of this study suggests that tourniquet increased oxidative stress marker in fracture state and Aloe vera extract could be used to ameliorate this ischemic-reperfusion injury.

The effect of Aloe vera ethanolic extract in preventing ischemic-reperfusion injury during long bone fracture healing after tourniquet application: An animal study

Background: Tourniquet is a common instrument used in Orthopedics field to reduce blood loss, providing a better operating field. One of the deleterious effects of tourniquet is ischemic-reperfusion injury, which occurs after deflation of the tourniquet. One of the possible ways to mitigate ischemic-reperfusion injury is by administrating antioxidants to reduce oxidative stress. Natural ingredients like Aloe vera are well known for its antioxidant and anti-inflammatory activities. This experimental study was conducted by fracturing the tibia of male Wistar strain rats (Rattus norvegicus) and administering Aloe vera gel orally as antioxidant. Method: A total of 18 rats were used in this study, divided into 6 groups. The first group was the control group, that included rats with fractured tibia not receiving torniquet and aloe vera treatment. The second and third groups were rats with fracture, who received torniquet application for one hour and two hours respectively without aloe vera treatment. The rest were the treatment groups, the rats with factures were given different dosages of Aloe vera extract: 40 mg/kg bodyweight (BW), 60 mg/kg BW, and 80 mg/kg BW. Three hours after administration, the tourniquet was inflated for two hours, followed by its deflation. The tibia was harvested to examine levels of superoxide dismutase (SOD), Malondialdehyde (MDA), and Bone morphogenetic protein 7 (BMP-7), and callus diameter, and osteoblast numbers were evaluated. Result: Administration of Aloe vera extract reduced the oxidative stress parameters (SOD and MDA). Tourniquet application decreased the osteoblast cell count and callus diameter, and administration of Aloe vera extract increased both variables close to the control value (p<0.05). Conclusion: The result of this study suggests that Aloe vera extract could be used to ameliorate ischemic-reperfusion injury.

The Role of Surface Chemistry in the Osseointegration of PEEK Implants.

Poly(etheretherketone) (PEEK) implants suffer from poor osseointegration because of chronic inflammation. In this study, we hypothesized that adding NH2 and COOH groups to the surface of PEEK could modulate macrophage responses by altering protein adsorption and improve its osseointegration. NH2 and COOH-functionalized PEEK surfaces induced pro- and anti-inflammatory macrophage responses, respectively, and differences in protein adsorption patterns on these surfaces were related to the varied inflammatory responses. The macrophage responses to NH2 surfaces significantly reduced the osteogenic differentiation of mesenchymal stem cells (MSCs). MSCs cultured on NH2 surfaces differentiated less than those on COOH surfaces even though NH2 surfaces promoted the most mineralization in simulated body fluid solutions. After 14 days in rat tibia unicortical defects, the bone around NH2 surfaces had thinner trabeculae and higher specific bone surface than the bone around unmodified implants; surprisingly, the NH2 implants significantly increased bone-binding over the unmodified implants, while COOH implants only showed a trend for increasing bone-binding. Taken together, these results suggest that both mineral-binding and immune responses play a role in osseointegration, and PEEK implant integration may be improved with mixtures of these two functional groups to harness the ability to reduce inflammation and bind bone strongly.

A Histological Study on the Short-Term Effects of Zoledronate, a Third Generation Bisphosphonate, on the Trabeculae of Growing Bone of Tibia in Albino Rats

A Histological Study on the Short-Term Effects of Zoledronate, a Third Generation Bisphosphonate, on the Trabeculae of Growing Bone of Tibia in Albino Rats

The adaptive response of rat tibia to different levels of peak strain and durations of experiment

The osteogenic response of bone to compressive load is affected by peak strain and duration of experiment, however, combined effect of peak load and duration of experiment on the rat tibia axial loading model remains unclear. In this study, rat tibia axial loading models with different levels of peak strains and durations of experiments were established (peak loads: 10 N, 20 N and 40 N, experimental duration: 2 weeks and 4 weeks). Microcomputer tomography scanning (Micro-CT), compression mechanical test and bone tissue alkaline phosphatase (ALP) and tartrate-resistant acid phosphatase (TRAP) staining were used to investigate the effects of cyclic loading with different levels of peak strains and durations of experiments on osteogenic response of tibia in adult female Sprague-Dawley (SD) rats. This experiment demonstrates that high-level strain can significantly stimulate the osteogenic response of cancellous and cortical bones in a short period of time. However, under mid-level strain, prolonging the experiment time can significantly improve the microsturcture and macromechanical properties of bone, increase the number of osteoblasts, and achieve the goal of improving bone quality. In this study, two loading schemes of mid-level-long-term and high-level-short-term were analyzed, and the mechanical response of the tibia under two different loading schemes was investigated. It provided a theoretical basis for further promoting the study of improving human bone quality and preventing aging-related bone diseases through mechanical stimulation.