@@

Objective To investigate the effect of two kinds of injected biomaterial combined with bone morphological protein (BMP) on tendon-to-bone healing after anterior cruciate ligament reconstruction (ACL) in rabbits. Methods ACL reconstruction was performed bilaterally in 50 skeletally mature rabbits using long digital extensor tendon grafts. Injected fibrin glue (FG) or injected calcium phosphate cements (CPC) combined with BMP were implanted into the treated knee of each rabbit,with the contralateral knees as controls. Every three rabbits were killed at 2,6 and 12 weeks postoperatively for routine histological studies. The samples were processed through Micro CT and subsequent HE and toludine blue staining. The remaining 16 rabbits were sacrificed at 6 and 12 weeks. Their femur-tendon graft-tibia complexes were harvested for subsequent mechanical testing. Results Imageological results showed that 6 weeks after operation,bone mineral density (BMD) values in FG-bBMP group were higher than those in CPC-bBMP group. However,12 weeks after operation,BMD values in CPC-bBMP group were the highest in the three groups. Histological findings of the interface between the tendon and bone differed in the three groups. Two weeks after operation,more chondrocyte-like cells that were fairly disorganized were noted between the tendon and bone in FG-bBMP group. Six weeks after operation,mature bone formation around the tendon was observed in FG-bBMP group while more immature bone ingrew toward implanted tendon in CPC-bBMP group; at 12 weeks,more chondrocyte cells and new bone formation were seen in CPC-bBMP group while a small quantity of mature bone was around tendon in FG-bBMP group. In biomechanical evaluation,the maximum pull-out load of the tendon from the bone tunnel was significantly higher in the two treatment groups than in the control group 6 and 12 weeks after operation (P

Objective To explore the outcome of acetabular fractures operative treatment. Methods 62 patients with acetabular fractures were enrolled in this study. According to classification of Letournel, fracture of posterior wall 13 cases, fracture of posterior column 9 cases, fracture of anterior column 5 cases, transverse fracture 4 cases, transverse fracture with fracture of posterior wall 6 cases, double column fracture 10 cases, fracture of posterior wall and posterior column 8 cases, fracture of T type 7 cases. Results 62 patients were followed-up for more than one year after operation. All cases had bone union without complications of the infection and sciatic nerve injury. Traumatic arthritis occurred in 2 cases, and the function of the hip-joint was limited in 3 cases. Conclusion Operative reduction and internal fixation can notably increase forward outcome of acetabular fractures.

[Objective]To investigate the changes of pore sizes,crosslinking index,swelling ration,degradation rate,cytotoxicity and biocompatibility of genipin crosslinked collagen/chitosan scaffolds affected by the different crosslinking temperature points.[Method]The freeze-dried collgaen/chitosan scaffolds crosslinked with 0.5% genipin within 24 h were divided into 3 groups by crosslinking temperature:4℃ group,20℃ group and 36℃ group.The characteristics of pore sizes,crosslinking index,swelling ratio,degradation rate,cytotoxicity and biocompatibility were evaluated.Collagen/chitosan scaffolds without crosslinking were chosen as control group.[Result]With the increase of temperature,crosslinking index was increased,but swelling ratio and degradation rate were decreased.In 4℃ group,the crosslinking index was 47.88%?6.4%,the swelling ratio was 721%?46%,and the degradation rate was decreased by 3.95%?6.4% at 4 weeks.In 20℃ group,the crosslinking index was 67.69%?3.6%,the swelling ration was 662%?72%,and the degradation rate was 0.91%?5.9% in 4 weeks.In 36℃ group,the crosslinking index was 70.32%?5.7%,the swelling ration was 635%?27%,and the degradation rate was 0.66%?7.3% at 4 weeks.The above indexes of the three groups were much better than those of control group(P

[Objective]To investigate the effects of two different densities of bone marrow mesenchymal stem cells (BMSCs) combined with ?-TCP on spinal fusion in rabbits.[Method]Spinal fusion surgery of lumber intertransverse process were performed using MSCs/?-TCP as a graft in two groups of rabbits (low density group versus high density group),and rate of lumbar fusion,image characteristics,bone mineralization content,bone mineralization density,bone mineralization tissue volume and rate of new bone formation were observed.[Result]Compared with the low intensity group,the rate of lumbar fusion was greatly improved in the high density group(P

[Objective]To investigate the effect of reconstituted bone xenografts(RBX) on tendon-to-bone healing by means of imaging,histological and biomechanical studies.[Method]Anterior cruciate ligament(ACL) reconstruction was performed bilaterally in 25 skeletally mature rabbits using long digital extensor tendon grafts.RBX were implanted into the treated knee of each rabbit,with the contralateral knees as controls.Every three rabbits were killed at 2,6 and 12 weeks postoperatively for routine histological studies.The samples were processed through Micro CT and subsequent HE and toludine blue staining.The remaining 16 rabbits were sacrificed at 6 and 12 weeks.Their femur-tendon graft-tibia complexes were harvested for subsequent mechanical testing.[Result]At 6 and 12 weeks after operation,the values of BMD in the RBX group were higher than those in the control group(P

Objective To investigate tbe pharmacodynamics of different local anesthetics administered intrathecally for caesarean section. Methods Ninety-six parturients with singleton term pregnancies undergoing caesarean section under combined spinal-epidural anesthesia were enrolled in this study. The patients were randomly divided into 3 groups ( n = 32 each ) and received intrathecal (IT) 0.5 % bupivacaine, 0.5 %levobupivacaine and 0.5% ropivacaine respectively. The initial doses was 9 mg in all 3 groups. The ratio of two successive doses was 0.9. If the upper sensory block reached T7 or above and there was no need for additional dose in the 45 min after the initial dose, the IT analgesia was considered to be effective. The median effective dose ( ED50 ), the 95 % effective dose( ED95) and 95 % confidence interval (95 % CI )were calculated by Dixon. Results The ED50 and ED95 and 95%CI of bupivacaine were 6.15 (95%CI 5.48-6.68) mg and 7.62 (95%CI 6.91-11.82) mg; of levobupivacaine were 8.06 (95%CI 7.46-8.62) mg and 9.59 (95%CI 8.86-13.42) mg;of ropivacaine were 10.55 (95%CI 9.73-11.49) mg and 12.80 (95%CI 11.66-21.42) mg. The relative potency potency ratio between bupivacaine, levobupivacaine and rupivacaine is 1.00:0.76:0.58.

Two cases of nevus of Ota resistant to multiple sessions of Q-switched laser treatment are reported.Both of the patients were females,who developed beige or blue patches on the left side of the face (zygomatic region,cheek)several months after birth.No conjunctiva or sclera was involved.The lesions spread to the left retroauricular region and posterior neck during pregnancy in one patient.Histopathological examination of the lesions showed scattered melanocytes and melanophages in lower dermis and subcutaneous adipose tissue as well as apparent proliferation of collagen.Immunostaining for CD34 showed no abnormality in the distribution of vascular endothelial cells in these tissues.No obvious improvement was observed in either of the patient after more than 10 sessions(12 sessions in 1 case,and 13 sessions in the other case)of treatments with Q-switched alexandrite(755 nm)or Q-switched Nd:YAG laser(1064 nm).The immediate response of lesions to laser irradiation was unusual.Purpura or errhysis was absent in the lesions after repetitive irradiation with high-energy laser,but both were visible in the adjacent normal skin even after irradiation with low-energy laser.

Objective To investigate the dose-effect relationship between Q-switch ruby laser and skin pigmentation in Guinea pigs. Methods Ten Guinea pigs were included in this study, and the back of each pig was divided into 5 areas, negative control area receiving no UVB irradiation or laser treatment, positive control area receiving UVB irradiation but no laser treatment, low-, middle- and high-dose areas receiving UVB irradiation followed by the treatment with laser at an energy density of 1.5, 3.0 and 6.0 J/cm2 for 4, 2, and 1 session, respectively, with an interval of 1 week. Melanin content index (MCI) was determined, and confocal laser scanning microscopy (CLSM) and histopathology were performed to observe melanin granules and melanocytes in the skin tissue from Guinea pigs before the initial laser treatment, 2 and 4 weeks after the final laser treatment. Results The best response was observed in the low-dose areas, and there was a complete clearance of hyperpigmentation in these areas, which maintained 8 weeks without recurrence, while different degrees of skin pigmentation recurred in the middle- and high-dose areas. Moreover, the low-dose areas showed a significantly lower melanin content index (MCI) compared with the middle- and high-dose areas (F = 4.2,P < 0.05), together with a marked reduction in the extent of pigment deposition, melanin granules, melanocyte number and density. Conclusions The efficacy of Q-switched ruby laser on skin pigmentation in Guinea pigs is correlated with the energy density and treatment frequency, and, low intensity and high frequency are often associated with a better treatment outcome.

Objective: To investigate the diagnostic value of 64 multislice spiral CT (64-MSCT) and 1.5T MRI in nurseling with congenital vascular rings.
Methods:We retrospectively studied the diagnostic records of 64-MSCT and 1.5T MRI in 48 nurseling with congenital vascular rings. There were 42 cases received CTA, 12 received MRA and 6 received both CTA and MRA. We classiifed the types of vascular rings by Edwards sketch map of aortic arch embryonic development and trachea wrapping conditions. The diagnostic values of 64-MSCT and 1.5T MRI on vascular rings were compared.
Results: There were 25 patients with complete vascular rings including 3 of double aortic arch, 12 right aortic arch with left subclavian artery and patent ductus arteriosus (PDA), 9 combining with arterial ligament, 1 neck right aortic arch with left subclavian artery combining left PDA;and 23 patients with in-complete vascular rings including 2 pulmonary artery sling, 9 left aortic arch with right subclavian artery combining left PDA, 10 combining with arterial ligament, 1 right aortic arch with left subclavian artery combining right PDA, 1 with innominate artery compressed trachea. There were 32/48 patients combined with cardiac malformations, both 64-MSCT and 1.5T MRI may well reveal the composition and special relationship of vessel rings. The minimum intensity projection (MinIP) and air volume rendering (VR) of 64-MSCT may clearly display the morphology and development of trachea, image fusion technique could directly show the special relationships among vascular rings, trachea and esophagus. While 1.5T MRI was relatively poor to present tracheal image.
Conclusion: 64-MSCT could accurately and comprehensively display the special relationships among the vessels rings, trachea and esophagus;which was the best method for diagnosing the nurseling with vessel rings in clinical practice.