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To explore the potential therapeutic effects of endothelial progenitor cells derived small extracellular vesicles (EPCs-sEVs) on spinal cord injury in mice.<br />EPCs were separated from femur and tibia bone marrow of 20 C57BL/6 male mice, and identified by double fluorescence staining and flow cytometry. Then the EPCs were passaged and the cell supernatants from P2-P4 generations EPCs were collected; the EPCs-sEVs were extracted by ultracentrifugation and identified by transmission electron microscopy, nanoflow cytometry, and Western blot. Forty C57BL/6 female mice were randomly divided into 4 groups (<br />=10). The mice were only removed T<br />lamina in sham group, and prepared T<br />spinal cord injury models in the model group and the low and high concentration intervention groups. After 30 minutes, 3 days, and 7 days of operation, the mice in low and high concentration intervention groups were injected with EPCs-sEVs at concentrations of 1×10<br />and 1×10<br />cells/mL through the tail vein, respectively. The behae Von Frey test showed that the mechanical pain threshold of the two intervention groups were significantly higher than that of model group and lower than that of sham group (<br />&lt;0.05); there was no significant difference between two intervention groups (<br />&gt;0.05). Compared with the model group, the injured segment of the two intervention groups had smaller spinal cord tissue defects, less mononuclear cells infiltration, more obvious tissue structure recovery, and more angiogenesis, and these differences were significant (<br />&lt;0.05); there was no significant difference between the two intervention groups.<br />EPCs-sEVs can promote the repair of spinal cord injury in mice and provide a new plan for the biological treatment of spinal cord injury.<br />EPCs-sEVs can promote the repair of spinal cord injury in mice and provide a new plan for the biological treatment of spinal cord injury.<br />To investigate the effectiveness of retrograde muscle release in treatment of mild to moderate type ischemic muscle contracture of forearm classified by Tsuge.<br />Between March 2010 and September 2018, 11 patients with mild to moderate ischemic muscle contracture of forearm were treated with retrograde muscle release. [https://www.selleckchem.com/products/phycocyanobilin.html PCBchemical] There were 6 males and 5 females with an average age of 24 years (range, 16-29 years). According to Tsuge classification, 6 cases were mild type and 5 cases were moderate type. The interval between injury and operation was 9 months to 25 years, with a median of 17 years. The scar cords in the muscle of the middle one-third of the forearm was released firstly. If the standard of sufficient release was not reached, further releasing the scar cords in the muscle and the tense tendon structure in the proximal one-third of the forearm and the origins of the flexor muscles was necessary. If the standard was still not reached, the origins of the flexor muscles can be released and slid. The effectivenecrush injury still felt numb after operation, and the two-point discrimination of median nerve and ulnar nerve was 8 mm and 7 mm, respectively. The Quick-DASH score was 0-15.9, with an average of 4.5, and the PRWHE score was 0-23.0, with an average of 6.6. All the patients were satisfied with the surgery and the effectiveness.<br />A targeted retrograde muscle release method for mild to moderate type ischemic contracture of forearm can achieve satisfactory effectiveness.<br />A targeted retrograde muscle release method for mild to moderate type ischemic contracture of forearm can achieve satisfactory effectiveness.<br />To investigate the effectiveness of multiple tension reduction suture of<br />return needle vertical mattress suture and<br />return needle horizontal mattress suture combination with intradermal intermittent continuous suture (denominated as Zunyi's Suture Method) on suturing the donor site of the anterolateral thigh flap.<br />Between January 2019 and December 2019, 62 patients were treated with anterolateral thigh flaps to repair wounds. There were 46 males and 16 females, aged 9-67 years (mean, 31 years). The size of anterolateral thigh flap ranged from 6 cm×5 cm to 25 cm×7 cm. The donor site of the flap was sutured directly by the Zunyi's Suture Method. The skin on both sides of the incision was advanced to the middle, and the wound edge was attached and in a state of negative tension. The intradermal suture line was removed at 7 days after operation. The complications and scars at donor site were observed during follow-up. The Vancouver Scar Scale was used to assess the appearance of scars and the width of s.<br />To investigate the feasibility and mechanical properties of polymethyl methacrylate (PMMA) bone cement and allogeneic bone mixture to strengthen sheep vertebrae with osteoporotic compression fracture.<br />A total of 75 lumbar vertebrae (L<br />-L<br />) of adult goats was harvested to prepare the osteoporotic vertebral body model by decalcification. The volume of vertebral body and the weight and bone density before and after decalcification were measured. And the failure strength, failure displacement, and stiffness were tested by using a mechanical tester. Then the vertebral compression fracture models were prepared and divided into 3 groups (<br />=25). The vertebral bodies were injected with allogeneic bone in group A, PMMA bone cement in group B, and mixture of allogeneic bone and PMMA bone cement in a ratio of 1∶1 in group C. After CT observation of the implant distribution in the vertebral body, the failure strength, failure displacement, and stiffness of the vertebral body were measured again.<br />There was no sbetween groups were significant (<br />&lt;0.05). Except for the failure strength of group A (<br />&gt;0.05), the differences in the failure strength, failure displacement, and stiffness before fracture and after augmentation in the other groups were significant (<br />&lt;0.05).<br />The mixture of allogeneic bone and PMMA bone cement in a ratio of 1∶1 can improve the strength of the vertebral body of sheep osteoporotic compression fractures and restore the initial stiffness of the vertebral body. It has good mechanical properties and can be used as one of the filling materials in percutaneous vertebroplasty.<br />The mixture of allogeneic bone and PMMA bone cement in a ratio of 1∶1 can improve the strength of the vertebral body of sheep osteoporotic compression fractures and restore the initial stiffness of the vertebral body. It has good mechanical properties and can be used as one of the filling materials in percutaneous vertebroplasty.