Chitosan/nano-hydroxyapatite composites with different weight ratios were prepared through a co-precipitation method using Ca（OH）2, H3PO4 and chitosan as starting materials. The properties of these composites were c...Chitosan/nano-hydroxyapatite composites with different weight ratios were prepared through a co-precipitation method using Ca（OH）2, H3PO4 and chitosan as starting materials. The properties of these composites were characterized by means of TEM, IR, XRD, TGA, burn-out tests and universal matertial testing machine. The results showed that the HA synthesized here was poorly crystalline carbonated nanometer crystals and dispersed uniformly in chitosan phase and there was no phase-separation between the two phases. The addition of n-HA resulted in a decrease of decomposing temperature of chitosan. Because of the interactions between chitosan and n-HA, the mechanical properties of these composites were improved, and the maximum value of the compressive strength was measured to be about 120MPa corresponding to the chitosan/n-HA composite with a weight ratio of 30/70.展开更多
Patients with osteomyelitis require lengthy antibiotic treatment, often only to see the inflammation flare up once antibiotics are suspended. Unfortunately, patients often discontinue the antibiotic treatment due to c...Patients with osteomyelitis require lengthy antibiotic treatment, often only to see the inflammation flare up once antibiotics are suspended. Unfortunately, patients often discontinue the antibiotic treatment due to collateral effects. Patients with osteitis are often polymorbid patients with other severe diseases such as diabetes mellitus and polyneuropathy, arteriopathy or polyarthfitis with immunosuppression. The eight patients included in the study presented nine bones with osteomyelitis （macroscopically, bacteriologically, histologically or radiologically）. The diseased part of the bone was resected, a locally radical debridement was done and a biopsy for bacteriology and histology were taken. The residual bone was then drilled out and filled with antibiotic-loaded （gentamicin） resorbable bone-graft substitute under radiologic imaging control. In total, seven patients are currently without recurrent osteomyelitis with a mean follow-up of 5.77 months （2-11 months）. The Kaplan Meier curve shows 80% survival rate without recurrent osteomyelitis at 11 months. Only one patient suffering from Morbus Buerger had a relapse osteomyelitis after cutting off severing his foot while swimming in the sea. Antibiotic-loaded resorbable bone-graft substitute is easy to use, has in our hands few complications and low recurrence rate.展开更多
The objective of this study was to investigate the hemocompatibility and cell responses to some novel poly（L-lactide） （PLA） composites containing surface modified hydroxyapatite particles for potential application...The objective of this study was to investigate the hemocompatibility and cell responses to some novel poly（L-lactide） （PLA） composites containing surface modified hydroxyapatite particles for potential applications as a bone substitute material. The surface of hydroxyapatite （HA） particles was first grafted with L-lactic acid oligomers to form grafted HA （g-HA） particles. The g-HA particles were further blended with PLA to prepare g-HA/PLA composites. Our previous study has shown signifi- cant improvement in tensile properties of these materials due to the enhanced interracial adhesion between the polymer matrix and HA particles. To further investigate the potential applications of these composites in bone repair and other orthopedic sur- geries, a series of in vitro and in vivo experiments were conducted to examine the cell responses and hemocompatibility of the materials. In vitro experiments showed that the g-HA/PLA composites were well tolerated by the L-929 cells. Hemolysis of the composites was lower than that of pure PLA. Subcutaneous implantation demonstrated that the g-HA/PLA composites were more favorable than the control materials for soft tissue responses. The results suggested that the g-HA/PLA composites are promising and safe materials with potential applications in tissue engineering.展开更多
The objective of this study was to evaluate the effectiveness of Chinese massage therapy in patients with knee osteoarthritis(OA) by measuring lower-limb gait parameters. We recruited 20 women with knee OA,who then un...The objective of this study was to evaluate the effectiveness of Chinese massage therapy in patients with knee osteoarthritis(OA) by measuring lower-limb gait parameters. We recruited 20 women with knee OA,who then underwent Chinese massage therapy three times per week for 2 weeks. The patients underwent gait evaluation using a six-camera infrared motion analysis system. They completed Western Ontario and Mc Master Universities Osteoarthritis Index questionnaires before and after treatment. We calculated the forward speed,step width,step length,total support time percentage,initial double support time percentage,and single support time percentage. We also measured the angles at the knee,hip,and ankle during the stance phase of walking. The results showed statistically significant mean differences in knee pain relief,alleviation of stiffness,and physical function enhancement after therapy(P < 0.05). The patients gained significantly faster gait speed,greater step width,and increased total support time percentage after the Chinese massage therapy(P < 0.05). There were no significant differences in the range of motion or initial contact angles of the knee,hip,or ankle during the stance phase of walking. We concluded that Chinese massage is a beneficial complementary treatment and an alternative therapy choice for patients with knee OA for short-term pain relief. Chinese massage may improve walking ability for these patients.展开更多
文摘Chitosan/nano-hydroxyapatite composites with different weight ratios were prepared through a co-precipitation method using Ca（OH）2, H3PO4 and chitosan as starting materials. The properties of these composites were characterized by means of TEM, IR, XRD, TGA, burn-out tests and universal matertial testing machine. The results showed that the HA synthesized here was poorly crystalline carbonated nanometer crystals and dispersed uniformly in chitosan phase and there was no phase-separation between the two phases. The addition of n-HA resulted in a decrease of decomposing temperature of chitosan. Because of the interactions between chitosan and n-HA, the mechanical properties of these composites were improved, and the maximum value of the compressive strength was measured to be about 120MPa corresponding to the chitosan/n-HA composite with a weight ratio of 30/70.
文摘Patients with osteomyelitis require lengthy antibiotic treatment, often only to see the inflammation flare up once antibiotics are suspended. Unfortunately, patients often discontinue the antibiotic treatment due to collateral effects. Patients with osteitis are often polymorbid patients with other severe diseases such as diabetes mellitus and polyneuropathy, arteriopathy or polyarthfitis with immunosuppression. The eight patients included in the study presented nine bones with osteomyelitis （macroscopically, bacteriologically, histologically or radiologically）. The diseased part of the bone was resected, a locally radical debridement was done and a biopsy for bacteriology and histology were taken. The residual bone was then drilled out and filled with antibiotic-loaded （gentamicin） resorbable bone-graft substitute under radiologic imaging control. In total, seven patients are currently without recurrent osteomyelitis with a mean follow-up of 5.77 months （2-11 months）. The Kaplan Meier curve shows 80% survival rate without recurrent osteomyelitis at 11 months. Only one patient suffering from Morbus Buerger had a relapse osteomyelitis after cutting off severing his foot while swimming in the sea. Antibiotic-loaded resorbable bone-graft substitute is easy to use, has in our hands few complications and low recurrence rate.
基金supported by the Research Fund for the Doctoral Program of Higher Education(Grant No.20060217012)
文摘The objective of this study was to investigate the hemocompatibility and cell responses to some novel poly（L-lactide） （PLA） composites containing surface modified hydroxyapatite particles for potential applications as a bone substitute material. The surface of hydroxyapatite （HA） particles was first grafted with L-lactic acid oligomers to form grafted HA （g-HA） particles. The g-HA particles were further blended with PLA to prepare g-HA/PLA composites. Our previous study has shown signifi- cant improvement in tensile properties of these materials due to the enhanced interracial adhesion between the polymer matrix and HA particles. To further investigate the potential applications of these composites in bone repair and other orthopedic sur- geries, a series of in vitro and in vivo experiments were conducted to examine the cell responses and hemocompatibility of the materials. In vitro experiments showed that the g-HA/PLA composites were well tolerated by the L-929 cells. Hemolysis of the composites was lower than that of pure PLA. Subcutaneous implantation demonstrated that the g-HA/PLA composites were more favorable than the control materials for soft tissue responses. The results suggested that the g-HA/PLA composites are promising and safe materials with potential applications in tissue engineering.
基金Supported by the National Science Foundation for Distinguished Young Scholars of China,Tuina Subject,(No.81025022)the National Natural Science Foundation of China,Biomechanics and Clinical Efficacy of Tuina Treatment on Knee Osteoarthritis(No.81373763)+2 种基金Science and Technology Commission of Shanghai Municipality,Kinematics and Kinetics Analysis of Patients with Knee Osteoarthritis Before and After Chinese Massage Treatment(No.11DZ1973501)Epidemiological Study on Risk Factors and Chinese Medical Syndrome of Knee Osteoarthritis in Shanghai City(No.12401904300)the Shanghai Municipal Health Bureau,Gait Analysis Before and After Chinese Massage Treatment on Patients with Knee Osteoarthritis(No.20114039)
文摘The objective of this study was to evaluate the effectiveness of Chinese massage therapy in patients with knee osteoarthritis(OA) by measuring lower-limb gait parameters. We recruited 20 women with knee OA,who then underwent Chinese massage therapy three times per week for 2 weeks. The patients underwent gait evaluation using a six-camera infrared motion analysis system. They completed Western Ontario and Mc Master Universities Osteoarthritis Index questionnaires before and after treatment. We calculated the forward speed,step width,step length,total support time percentage,initial double support time percentage,and single support time percentage. We also measured the angles at the knee,hip,and ankle during the stance phase of walking. The results showed statistically significant mean differences in knee pain relief,alleviation of stiffness,and physical function enhancement after therapy(P < 0.05). The patients gained significantly faster gait speed,greater step width,and increased total support time percentage after the Chinese massage therapy(P < 0.05). There were no significant differences in the range of motion or initial contact angles of the knee,hip,or ankle during the stance phase of walking. We concluded that Chinese massage is a beneficial complementary treatment and an alternative therapy choice for patients with knee OA for short-term pain relief. Chinese massage may improve walking ability for these patients.
