BACKGROUND:Distinct risk factors for new adjacent vertebral fractures following percutaneous vertebroplasty in the elderly patients with osteoporotic vertebral compression fractures and underlying diseases may be different,yet there is a scarcity of pertinent research on this topic.OBJECTIVE:To investigate the high-risk factors for refracture in patients with osteoporotic vertebral compression fractures following percutaneous vertebroplasty and to delve deeper into the correlation between these risk factors and the recurrence of fractures in the operated vertebra as well as its adjacent vertebrae post-percutaneous vertebroplasty.METHODS:According to the inclusion criteria,412 patients with osteoporotic vertebral compression fractures who underwent percutaneous vertebroplasty at the Sixth Affiliated Hospital of Xinjiang Medical University between January 2018 and December 2023 were retrospectively screened.According to whether re-fracture occurred during the follow-up period,the patients were divided into a re-fracture group(n=75)and a non-re-fracture group(n=337).The following variables of the two groups of patients were reviewed:age,gender,body mass index,cement leakage,bone density T value,cement dosage,occupation,smoking,drinking,adverse reactions,medical insurance,hypertension,type 2 diabetes,chronic obstructive pulmonary disease,cerebral hemorrhage,coronary heart disease,psychological trauma,psychiatric treatment,osteoarthritis,gout,scoliosis,spinal surgery,chronic kidney,anti-osteoporosis treatment,previous fracture history(fracture caused by osteoporosis)and fracture injury plane.The above factors were analyzed using univariate analysis.The factors with P＜0.05 were subjected to binary logistic analysis to explore the related factors of postoperative vertebral recompression fracture.RESULTS AND CONCLUSION:(1)Univariate analysis showed that after percutaneous vertebroplasty,vertebral refracture was associated with age,smoking history of＞10 years,cement leakage,hypertension,type 2 diabetes,scoliosis,spinal surgery,and chronic kidney disease,with statistically significant differences(P＜0.05).(2)By binary Logistic regression,bone cement leakage condition(OR=2.547,95％CI:1.283-5.048,P＜0.05),smoking history＞10 years(OR=2.336,95％CI:1.157-4.701,P＜0.05),a history of hypertension(OR=4.657,95％CI:2.137-10.242,P＜0.05),a history of type 2 diabetes mellitus(OR=8.956,95％CI:3.941-21.301,P＜0.05),and a medical history of scoliosis(OR=3.754,95％CI:1.755-8.619,P＜0.05),medical history of spinal surgery(OR=2.700,95％CI:1.058-6.725,P＜0.05),and a history of chronic kidney disease(OR=2.812,95％CI:1.078-7.739,P＜0.05)were risk factors for refracture of the operated vertebral body and adjacent vertebrae.(3)The results showed that cement leakage,smoking for＞10 years,hypertension,type 2 diabetes mellitus,scoliosis,spinal surgery,and chronic kidney were risk factors for recurrent fractures of the operated vertebrae and adjacent vertebrae in patients with osteoporotic vertebral compression fractures.Surgeons should conduct a comprehensive assessment of patients before percutaneous vertebroplasty in order to more accurately predict the possibility of re-fracture and provide a basis for the formulation of personalized treatment plans to reduce the risk of future recurrent fractures.

BACKGROUND:Distinct risk factors for new adjacent vertebral fractures following percutaneous vertebroplasty in the elderly patients with osteoporotic vertebral compression fractures and underlying diseases may be different,yet there is a scarcity of pertinent research on this topic.OBJECTIVE:To investigate the high-risk factors for refracture in patients with osteoporotic vertebral compression fractures following percutaneous vertebroplasty and to delve deeper into the correlation between these risk factors and the recurrence of fractures in the operated vertebra as well as its adjacent vertebrae post-percutaneous vertebroplasty.METHODS:According to the inclusion criteria,412 patients with osteoporotic vertebral compression fractures who underwent percutaneous vertebroplasty at the Sixth Affiliated Hospital of Xinjiang Medical University between January 2018 and December 2023 were retrospectively screened.According to whether re-fracture occurred during the follow-up period,the patients were divided into a re-fracture group(n=75)and a non-re-fracture group(n=337).The following variables of the two groups of patients were reviewed:age,gender,body mass index,cement leakage,bone density T value,cement dosage,occupation,smoking,drinking,adverse reactions,medical insurance,hypertension,type 2 diabetes,chronic obstructive pulmonary disease,cerebral hemorrhage,coronary heart disease,psychological trauma,psychiatric treatment,osteoarthritis,gout,scoliosis,spinal surgery,chronic kidney,anti-osteoporosis treatment,previous fracture history(fracture caused by osteoporosis)and fracture injury plane.The above factors were analyzed using univariate analysis.The factors with P＜0.05 were subjected to binary logistic analysis to explore the related factors of postoperative vertebral recompression fracture.RESULTS AND CONCLUSION:(1)Univariate analysis showed that after percutaneous vertebroplasty,vertebral refracture was associated with age,smoking history of＞10 years,cement leakage,hypertension,type 2 diabetes,scoliosis,spinal surgery,and chronic kidney disease,with statistically significant differences(P＜0.05).(2)By binary Logistic regression,bone cement leakage condition(OR=2.547,95％CI:1.283-5.048,P＜0.05),smoking history＞10 years(OR=2.336,95％CI:1.157-4.701,P＜0.05),a history of hypertension(OR=4.657,95％CI:2.137-10.242,P＜0.05),a history of type 2 diabetes mellitus(OR=8.956,95％CI:3.941-21.301,P＜0.05),and a medical history of scoliosis(OR=3.754,95％CI:1.755-8.619,P＜0.05),medical history of spinal surgery(OR=2.700,95％CI:1.058-6.725,P＜0.05),and a history of chronic kidney disease(OR=2.812,95％CI:1.078-7.739,P＜0.05)were risk factors for refracture of the operated vertebral body and adjacent vertebrae.(3)The results showed that cement leakage,smoking for＞10 years,hypertension,type 2 diabetes mellitus,scoliosis,spinal surgery,and chronic kidney were risk factors for recurrent fractures of the operated vertebrae and adjacent vertebrae in patients with osteoporotic vertebral compression fractures.Surgeons should conduct a comprehensive assessment of patients before percutaneous vertebroplasty in order to more accurately predict the possibility of re-fracture and provide a basis for the formulation of personalized treatment plans to reduce the risk of future recurrent fractures.

OBJECTIVE: To investigate the regulatory effect of electroacupuncture (EA) at "Neiguan" (PC6) on mitochondrial autophagy in rats with myocardial ischemia-reperfusion injury (MIRI) at different phases (ischemia and reperfusion phases), and to explore the bidirectional regulatory effects of EA at "Neiguan" (PC6) and its potential mechanism. METHODS: Forty-five male SD rats were randomly divided into 6 groups according to the random number table method, namely, sham-operation group (n=9), model-A group (n=6), model-B group (n=9), EA-A1 group (n=6), EA-B1 group (n=6), and EA-B2 group (n=9). Except the rats in the sham-operation group, the MIRI model was established in the other groups with the physical ligation and tube pushing method. In the model-A group, the samples were collected directly after ligation, and in the model-B group, the samples were collected after ligation and reperfusion. In the EA-A1 group, EA was delivered while the ligation was performed, and afterwards, the samples were collected. In the EA-B1 group, while the ligation was performed, EA was operated at the same time, and after reperfusion, the samples were collected. In the EA-B2 group, during ligation and the opening of the left anterior descending branch of the coronary artery, EA was delivered, and after reperfusion, the samples were collected. EA was performed at bilateral "Neiguan" (PC6), with a disperse-dense wave, a frequency of 2 Hz/100 Hz, a current of 1 mA, and a duration of 30 min. HE staining was employed to observe the morphology of cardiomyocytes, TUNEL was adopted to detect the apoptosis of cardiomyocytes, transcriptome sequencing was to detect the differentially expressed genes in the left ventricle, JC-1 flow cytometry was to detect the mitochondrial membrane potential (MMP) of cardiomyocytes, Western blot was to detect the protein expression of phosphatase and tensin homolog-induced kinase 1 (Pink1), Parkin and p62 in the left ventricle of rats, and ELISA was to detect the levels of serum creatine kinase isoenzyme (CK-MB) and cardiac troponin I (cTn-I) in the rats. RESULTS: Compared with the sham-operation group, the cardiomyocytes of rats in the model-B group were severely damaged, with disordered arrangement, unclear boundaries, broken muscle fibers, edema and loose distribution; and the cardiomyocytes in the EA-B2 group were slightly damaged, the cell structure was partially unclear, the cells were arranged more regularly, and the intact cardiomyocytes were visible. Compared with the sham-operation group, the apoptosis of cardiomyocytes increased in the model-B group (P<0.001); and when compared with the model-B group, the apoptosis alleviated in the EA-B2 group (P<0.001). The differentially expressed genes among the EA-B2 group, the sham-operation group and the model-B group were closely related to cell autophagy and mitochondrial autophagy. Compared with the sham-operation group, MMP of cardiomyocytes was reduced (P<0.001), the protein expression of Pink1, Parkin, and p62 of the left ventricle and the levels of serum CK-MB and cTn-I were elevated in the model B group (P<0.001). In comparison with model-A group, the MMP of cardiomyocytes and the levels of serum CK-MB and cTn-I were reduced (P<0.001, P<0.05), and the protein expression of Pink1 in the left ventricle rose in the EA-A1 group (P<0.01). Compared with the model-B group, MMP of cardiomyocytes increased (P<0.001), the protein expression of Pink1, Parkin, and p62 of the left ventricle, and the levels of serum CK-MB and cTn-I decreased (P<0.001) in the EA-B1 group and the EA-B2 group. When compared with the EA-A1 group, MMP of cardiomyocytes increased (P<0.001), and the protein expression of Pink1, Parkin, and p62 of the left ventricle, and the levels of serum CK-MB and cTn-I decreased in the EA-B1 group (P<0.01). CONCLUSION EA at "Neiguan" (PC6) can ameliorate MIRI in rats, which may be achieved through the Pink1/Parkin-mediated mitochondrial autophagy pathway. EA can alleviate myocardial injury by enhancing mitochondrial autophagy at the ischemia phase, and it can reduce reperfusion injury by weakening mitochondrial autophagy at the reperfusion phase.
Animals ; Electroacupuncture ; Male ; Myocardial Reperfusion Injury/metabolism* ; Rats, Sprague-Dawley ; Rats ; Acupuncture Points ; Autophagy ; Humans ; Mitochondria/genetics*

Objective:To evaluate the clinical equivalence between a domestic calcipotriol/betamethasone dipropionate ointment and the originator product in the treatment of stable plaque psoriasis.Methods:A multicenter, randomized, double-blind, three-arm, parallel-group, active- and placebo-controlled study was conducted, and 449 patients aged 18 - 65 years with stable plaque psoriasis were enrolled from 25 hospitals (such as the First Affiliated Hospital of China Medical University). Eligible patients had a baseline physician's global assessment (PGA) score of ≥ 3 points, baseline body surface area (BSA) involvement of 5% - 30%, and a target lesion psoriasis area and severity index (TL-PASI) for plaque elevation of ≥ 3 points. Participants were randomly assigned in a 2:2:1 ratio to the test group ( n = 179), reference group ( n = 180), and placebo group ( n = 90), and applied the domestic calcipotriol/betamethasone dipropionate ointment, originator product, and ointment base respectively, once daily in the evening for 4 weeks. Efficacy and safety were assessed at weeks 1, 2, and 4. The primary efficacy endpoints were the treatment success rates and clinical success rates in each group at week 4. The per-protocol set (PPS) was used for the primary efficacy analysis, and the intention-to-treat (ITT) set for supplementary efficacy analysis. Equivalence between the test and reference preparations was tested using the Cochran-Mantel-Haenszel method adjusted for randomization strata. Superiority of the test and reference preparations over the placebo was also tested. Measurement data were compared among the 3 groups using analysis of variance or non-parametric tests, while treatment success rates, clinical success rates, and incidence rates of adverse reactions were compared using the chi-square test. Results:The ITT, PPS, and safety sets included 447, 420, and 448 patients, respectively. In the ITT set, patients were aged 43.6 ± 12.8 years, including 320 (71.6%) males and 127 (28.4%) females, and the disease duration was 11.21 ± 9.05 years; 316 (70.7%) had a PGA score of 3 points and 131 (29.3%) had a PGA score of 4 - 5 points. No significant differences in the baseline characteristics (including age, sex, disease duration and disease severity) were observed among the 3 groups (all P > 0.05). Based on the PPS analysis, the treatment success rates were 57.9% (99/171) in the test group, 50.3% (86/171) in the reference group, and 7.7% (6/78) in the placebo group, and the clinical success rates were 57.9% (99/171), 50.3% (86/171), and 10.3% (8/78), respectively; both the test and reference groups were superior to the placebo group in both treatment and clinical success rates (all P < 0.001) ; the rate differences for treatment success (90% confidence interval [ CI]: -1.3% - 16.4%) and clinical success (90% CI: -1.3% - 16.3%) between the test and reference groups were entirely within the pre-defined equivalence margin (-20% - 20%). Subgroup analyses by baseline PGA scores: for patients with a baseline PGA score of 3 points, the treatment success rates in the test, reference, and placebo groups were 60.8% (73/120), 52.1% (62/119), and 11.1% (6/54), respectively, and the corresponding clinical success rates were 61.7% (74/120), 53.8% (64/119), and 13% (7/54), respectively; the test and reference groups did not differ significantly in treatment or clinical success rates (both P > 0.05), but both showed higher success rates than the placebo group (all P < 0.001) ; the results of statistical comparisons among the 3 groups in patients with a baseline PGA score of 4 - 5 points were consistent with those observed in patients with a baseline PGA score of 3 points. The percentage reductions in PGA and TL-PASI scores from baseline to weeks 1, 2, and 4 showed significant differences among the 3 groups, which were significantly higher in the test and reference groups than in the placebo group (all P < 0.001), but did not differ between the test and reference groups (all P > 0.05). The primary adverse reactions were local skin reactions, such as pruritus, pain, and erythema. The incidence rates of adverse reactions were 8.9% (16/179) in the test group, 7.3% (13/179) in the reference group, and 7.8% (7/90) in the placebo group, with no significant difference among the 3 groups ( P > 0.05) . Conclusions:The domestic calcipotriol/betamethasone dipropionate ointment demonstrated clinical equivalence to the originator product in the treatment of stable plaque psoriasis, and the two agents exhibited comparable efficacy for patients with varying degrees of disease severity, and were comparable in the speed and degree of clinical improvement, with similar favorable safety profiles.

BACKGROUND:The elastic modulus of traditional solid titanium alloy implants is higher than that of human bone,and the resulting"stress shielding"phenomenon may affect the osseointegration of implants.Simultaneously,the wettability of 3D printed titanium alloy surface needs to be improved.OBJECTIVE:To prepare hydrophilic Gyroid implants with excellent biomechanical properties.METHODS:The 3D models of Gyroid implant,solid implant,mandibular bone and crown were established,and the mechanical properties of different implants were analyzed by finite element analysis.The Gyroid structure implant model was imported into the 3D printer to make the Gyroid structure implant materialized,and then the hydrophilic Gyroid structure implant with excellent mechanical properties and surface activity was prepared by sandblasting acid etching and ultraviolet functionalization.The morphology and hydrophilicity of 3D printed Ti6Al4V specimens before and after surface modification were analyzed by scanning electron microscopy and contact angle test.RESULTS AND CONCLUSION:(1)The finite element analysis results showed that under the vertical average bite force,the Gyroid structure could uniformly disperse the load acting on the implant into the entire structure.The load on the solid structure implant could only be dispersed on its outer surface and concentrated in the neck.The maximum equivalent stress of the Gyroid structure implant was 200.67 MPa,which did not exceed 50%of the yield strength of Ti6Al4V material.The maximum equivalent stress of the Gyroid structure implant on the surrounding bone tissue was 24.27 MPa,which was slightly higher than the maximum equivalent stress of the solid structure implant 17.32 MPa,and in the range of 20-60 MPa.The stimulation effect of the Gyroid structure implant on new bone formation was better than that of the solid structure implant.(2)The 3D printing technology could materialize the Gyroid structure implant model.Scanning electron microscopy showed that there were many unmelted spherical metal particles on the surface of the 3D printed Ti6Al4V specimens.After sandblasting and acid etching,a micron-scale mesh pore structure was formed on the surface,and no protruding metal particles were seen.The surface morphology of the superimposed UV functional treatment group was basically consistent with that after sandblasting and acid etching.The contact angle test results showed that the surface hydrophilicity of the specimens treated with ultraviolet functionalization plus sandblasting and acid etching was better than that of the sandblasting and acid etching and non-surface treatment groups.(3)The sandblasting and acid etching technology can remove the weakly connected metal particles on the 3D printed specimen and improve the similarity between the solid model and the design model.On this basis,the ultraviolet functionalization treatment can significantly improve the hydrophilicity of the 3D printed Gyroid structure implant surface without affecting its structure.

Objective To analyze the characteristics of coronary atherosclerosis(CAS)and the gender differences in type 2 diabetes mellitus(T2DM)patients without cardiovascular disease symptoms using coronary artery computed tomography(CCTA).Methods A total of 178 asymptomatic individuals with T2DM who underwent CCTA examination due to CAS risk factors were included in this analysis in 2019,and they were divided into male group(n=105)and female group(n=73)according to sex.The general data and biochemical indicators of patients of different genders were compared.Logistic regression was used to analyze the influencing factors of high-risk signs of CAS in patients with T2DM.The incidences of coronary artery involvement score(SIS)≥4 and segmental stenosis score(St.S)≥3 in male and female patients with different courses of DM were compared.Results The age and the proportion of hypertension in female patients with T2DM were higher than those in male patients(P<0.05),while the body mass index(BMI),smoking history,triglyceride(TG),total cholesterol(TC)/high-density lipoprotein cholesterol(HDL-C),and proportions of SIS≥4 were lower than those in male patients(P<0.05).Logistic regression analysis showed that the hypertension duration was an influencing factor for the occurrence of high-risk signs of CAS in patients with T2DM.The proportion of SIS≥4 in the female DM duration was higher than<5 years(P<0.05),and the proportion of SIS≥4 in>15 years was lower than<5 years(P<0.05).Conclusions The incidence of CAS high-risk signs in T2DM patients without cardiovascular symptoms is different between different sexes,the number of affected segments in women was related to the DM duration.

Objective:To evaluate the clinical equivalence between a domestic calcipotriol/betamethasone dipropionate ointment and the originator product in the treatment of stable plaque psoriasis.Methods:A multicenter, randomized, double-blind, three-arm, parallel-group, active- and placebo-controlled study was conducted, and 449 patients aged 18 - 65 years with stable plaque psoriasis were enrolled from 25 hospitals (such as the First Affiliated Hospital of China Medical University). Eligible patients had a baseline physician's global assessment (PGA) score of ≥ 3 points, baseline body surface area (BSA) involvement of 5% - 30%, and a target lesion psoriasis area and severity index (TL-PASI) for plaque elevation of ≥ 3 points. Participants were randomly assigned in a 2:2:1 ratio to the test group ( n = 179), reference group ( n = 180), and placebo group ( n = 90), and applied the domestic calcipotriol/betamethasone dipropionate ointment, originator product, and ointment base respectively, once daily in the evening for 4 weeks. Efficacy and safety were assessed at weeks 1, 2, and 4. The primary efficacy endpoints were the treatment success rates and clinical success rates in each group at week 4. The per-protocol set (PPS) was used for the primary efficacy analysis, and the intention-to-treat (ITT) set for supplementary efficacy analysis. Equivalence between the test and reference preparations was tested using the Cochran-Mantel-Haenszel method adjusted for randomization strata. Superiority of the test and reference preparations over the placebo was also tested. Measurement data were compared among the 3 groups using analysis of variance or non-parametric tests, while treatment success rates, clinical success rates, and incidence rates of adverse reactions were compared using the chi-square test. Results:The ITT, PPS, and safety sets included 447, 420, and 448 patients, respectively. In the ITT set, patients were aged 43.6 ± 12.8 years, including 320 (71.6%) males and 127 (28.4%) females, and the disease duration was 11.21 ± 9.05 years; 316 (70.7%) had a PGA score of 3 points and 131 (29.3%) had a PGA score of 4 - 5 points. No significant differences in the baseline characteristics (including age, sex, disease duration and disease severity) were observed among the 3 groups (all P > 0.05). Based on the PPS analysis, the treatment success rates were 57.9% (99/171) in the test group, 50.3% (86/171) in the reference group, and 7.7% (6/78) in the placebo group, and the clinical success rates were 57.9% (99/171), 50.3% (86/171), and 10.3% (8/78), respectively; both the test and reference groups were superior to the placebo group in both treatment and clinical success rates (all P < 0.001) ; the rate differences for treatment success (90% confidence interval [ CI]: -1.3% - 16.4%) and clinical success (90% CI: -1.3% - 16.3%) between the test and reference groups were entirely within the pre-defined equivalence margin (-20% - 20%). Subgroup analyses by baseline PGA scores: for patients with a baseline PGA score of 3 points, the treatment success rates in the test, reference, and placebo groups were 60.8% (73/120), 52.1% (62/119), and 11.1% (6/54), respectively, and the corresponding clinical success rates were 61.7% (74/120), 53.8% (64/119), and 13% (7/54), respectively; the test and reference groups did not differ significantly in treatment or clinical success rates (both P > 0.05), but both showed higher success rates than the placebo group (all P < 0.001) ; the results of statistical comparisons among the 3 groups in patients with a baseline PGA score of 4 - 5 points were consistent with those observed in patients with a baseline PGA score of 3 points. The percentage reductions in PGA and TL-PASI scores from baseline to weeks 1, 2, and 4 showed significant differences among the 3 groups, which were significantly higher in the test and reference groups than in the placebo group (all P < 0.001), but did not differ between the test and reference groups (all P > 0.05). The primary adverse reactions were local skin reactions, such as pruritus, pain, and erythema. The incidence rates of adverse reactions were 8.9% (16/179) in the test group, 7.3% (13/179) in the reference group, and 7.8% (7/90) in the placebo group, with no significant difference among the 3 groups ( P > 0.05) . Conclusions:The domestic calcipotriol/betamethasone dipropionate ointment demonstrated clinical equivalence to the originator product in the treatment of stable plaque psoriasis, and the two agents exhibited comparable efficacy for patients with varying degrees of disease severity, and were comparable in the speed and degree of clinical improvement, with similar favorable safety profiles.

Objective To analyze the characteristics of coronary atherosclerosis(CAS)and the gender differences in type 2 diabetes mellitus(T2DM)patients without cardiovascular disease symptoms using coronary artery computed tomography(CCTA).Methods A total of 178 asymptomatic individuals with T2DM who underwent CCTA examination due to CAS risk factors were included in this analysis in 2019,and they were divided into male group(n=105)and female group(n=73)according to sex.The general data and biochemical indicators of patients of different genders were compared.Logistic regression was used to analyze the influencing factors of high-risk signs of CAS in patients with T2DM.The incidences of coronary artery involvement score(SIS)≥4 and segmental stenosis score(St.S)≥3 in male and female patients with different courses of DM were compared.Results The age and the proportion of hypertension in female patients with T2DM were higher than those in male patients(P<0.05),while the body mass index(BMI),smoking history,triglyceride(TG),total cholesterol(TC)/high-density lipoprotein cholesterol(HDL-C),and proportions of SIS≥4 were lower than those in male patients(P<0.05).Logistic regression analysis showed that the hypertension duration was an influencing factor for the occurrence of high-risk signs of CAS in patients with T2DM.The proportion of SIS≥4 in the female DM duration was higher than<5 years(P<0.05),and the proportion of SIS≥4 in>15 years was lower than<5 years(P<0.05).Conclusions The incidence of CAS high-risk signs in T2DM patients without cardiovascular symptoms is different between different sexes,the number of affected segments in women was related to the DM duration.

BACKGROUND:The elastic modulus of traditional solid titanium alloy implants is higher than that of human bone,and the resulting"stress shielding"phenomenon may affect the osseointegration of implants.Simultaneously,the wettability of 3D printed titanium alloy surface needs to be improved.OBJECTIVE:To prepare hydrophilic Gyroid implants with excellent biomechanical properties.METHODS:The 3D models of Gyroid implant,solid implant,mandibular bone and crown were established,and the mechanical properties of different implants were analyzed by finite element analysis.The Gyroid structure implant model was imported into the 3D printer to make the Gyroid structure implant materialized,and then the hydrophilic Gyroid structure implant with excellent mechanical properties and surface activity was prepared by sandblasting acid etching and ultraviolet functionalization.The morphology and hydrophilicity of 3D printed Ti6Al4V specimens before and after surface modification were analyzed by scanning electron microscopy and contact angle test.RESULTS AND CONCLUSION:(1)The finite element analysis results showed that under the vertical average bite force,the Gyroid structure could uniformly disperse the load acting on the implant into the entire structure.The load on the solid structure implant could only be dispersed on its outer surface and concentrated in the neck.The maximum equivalent stress of the Gyroid structure implant was 200.67 MPa,which did not exceed 50%of the yield strength of Ti6Al4V material.The maximum equivalent stress of the Gyroid structure implant on the surrounding bone tissue was 24.27 MPa,which was slightly higher than the maximum equivalent stress of the solid structure implant 17.32 MPa,and in the range of 20-60 MPa.The stimulation effect of the Gyroid structure implant on new bone formation was better than that of the solid structure implant.(2)The 3D printing technology could materialize the Gyroid structure implant model.Scanning electron microscopy showed that there were many unmelted spherical metal particles on the surface of the 3D printed Ti6Al4V specimens.After sandblasting and acid etching,a micron-scale mesh pore structure was formed on the surface,and no protruding metal particles were seen.The surface morphology of the superimposed UV functional treatment group was basically consistent with that after sandblasting and acid etching.The contact angle test results showed that the surface hydrophilicity of the specimens treated with ultraviolet functionalization plus sandblasting and acid etching was better than that of the sandblasting and acid etching and non-surface treatment groups.(3)The sandblasting and acid etching technology can remove the weakly connected metal particles on the 3D printed specimen and improve the similarity between the solid model and the design model.On this basis,the ultraviolet functionalization treatment can significantly improve the hydrophilicity of the 3D printed Gyroid structure implant surface without affecting its structure.