Objective To explore the puncture technic and method of the transabdominal L5/S1 lumbar diskectomy (TALD). Methods Two cases of cadaver were dissected and L5/S1 intervertebral disks were explored and punctured from different angles in order to probe the proper puncture angle for the needling. The radiographs of the lumbar and sacral vertabral samples of 30 cases were scrutinized and analysed to find the pancture imaging marks of the bones. When performing barium meal examinations, the lumbar and sacral spine of 200 cases were inspected to figure out the opacification of the rate imaging marks. 68 cases TALD were reviewed. Results The most pivotal process of the TALD is the needle puncture should be in parallel direction with lumbosacral interspace and then be pushed into the intervertebral disk. In order to make sure of the puncture point two sticking points should be fixed, on the abdomen and the another at the front edges of L5/S1 intervertebral disks. The five imaging makes of the lumbar, sacral, spine together with the neighboring L5/S1 intervertebral disks are of important help to find the front edges. Conclusion The correct puncture method is very important for performing TALD.

Objective To study the dynamic expression and distribution of high mobility group box 1 (HMGB-1)in diffuse axonal injury (DAI)in rats and to clarify its involvement in the inflammatory reaction after DAI in rats,in order to provide new targets for the clinical treatment of DAI.Methods A DAI model was established using a coronal rotation device and evaluated by HE,Glees-Marsland silver staining,and Mallory phosphotungstic acid hematoxylin staining.Immunohistochemistry,Western blot and RT-PCR were used to detect the expression and distribution of HMGB-1 in the cortex of DAI rats at 6 h,1 d,3 d and 7 d.And TUNEL was used to examine the apoptosis of neurons in DAI rats.Results Immunohistochemical results showed that at 6 h and 1 d after DAI,the number of HMGB-1-positive cells decreased,but at 3 and 7 d it began to increase.Western blot also showed that during the early stage after DAI (6 h and 1 d),the level of HMGB-1 protein in the cortex was significantly lower than that in the control group,but at the late stage (3 and 7 d)after DAI it significantly increased compared with that in the control group until 7 d.RT-PCR showed that at 6 h after DAI there was no significant increase in the level of HMGB-1mRNA,but at 1 d there was a slight increase compared with the control group;at 3 and 7 d,it showed an obvious significance.TUNEL staining indicated that the significant neuronal apoptosis appeared as early as 6 h after DAI,and reached the peak at 3 d;it started to decrease at 7 d but still remained at a relatively high level.Conclusion The dynamic expression and distribution of HMGB-1 showed significant changes with the time course after DAI in rats.They decreased at the early stage but increased at the late stage.At the early stage, HMGB-1 is mainly passively released by the necrotic neurons,and at the late stage it may be actively secreted by the active inflammatory cells.HMGB-1 may mediate the post-DAI neural cell apoptosis by inducing the inflammatory reaction.

Objective To evaluate and compare the clinical outcome of coracoclavicular screw and double Endobutton plate in treatment of acromioclavicular dislocation ( Rockwood Ⅲ-Ⅴ ). Methods Twenty-eight patients with Rockwood Ⅲ-Ⅴ acromioclavicular dislocation were subjected to surgical reconstruction from January 2008 to October 2009. The coracoclavicular screw was performed in 14 patients and the double Endobutton plate in the other 14 patients. Clinical evaluation was performed by using Constant score and subject should value (SSV) in both groups, and the preoperative and postoperative radiographs, curative effects and complications were compared. Results The patients in two groups were followed up for a range of 6-25 months (average 12.6 months) , which showed higher postoperative Constant score and SSV score than preoperation in both groups (P＜0.05). But the postoperative Constant sore and postoperative SSV score in the double Endobutton group were (89.8 ±8.3) points and (85.7 ±7. 3) points respectively, significantly better than (78. 0 ± 10. 3) points and (71. 8 ±9. 7) points respectively in the coracoclavicular screw group ( P ＜ 0.05). The radiologic measurement showed no significant difference in regard of the coracoclavicular distance three months after operation in two groups (P＞0.05). Conclusions The double Endobutton plate can attain significantly superior clinical outcomes for Rockwood Ⅲ-Ⅴ acromioclavicular dislocation compared with the coracoclavicular screw. The surgical technique of reconstructing the coracoclavicular ligament through anatomical approach will be the future trend in treatment of the acromioclavicular joint dislocation.

Objective To investigate the improvement and effect of the method of islet extraction in mice. Methods According to different islet extraction methods, all mice were randomly divided into the common bile duct puncture group (n=100) and common bile duct puncture combined with in situ pancreatic injection group (combined injection group, n=100). Common bile duct puncture combined with in situ pancreatic injection was utilized as the modified method. The islets were selected and purified under stereomicroscope. The morphology and purification of islets were identified. The islet yield and success rate of islet extraction were statistically compared between two groups. The survival of islets after 1 week culture in vitro was analyzed, and the insulin secretion function of islets after 24 h and 4 d culture in vitro was evaluated. Results Compared with the common bile duct puncture group, the islet yield in the combined injection group was significantly increased (P < 0.001). The success rate of islet extraction in both groups was 83% with no statistical significance (P > 0.05). The islets extracted by common bile duct puncture combined with in situ pancreatic injection had intact morphology, high purity and high activity. The survival rate of newly isolated islets was nearly 100% after 24 h culture in vitro. After 1~5 d culture in vitro, the islet cells survived well. After 6 d culture in vitro, the islets showed central death. After culture in vitro for 24 h and 4 d, the islet function of the mice was normal after high glucose stimulation. Conclusions Common bile duct puncture combined with in situ pancreatic injection can increase the islet yield, and the obtained islet cells have high activity and proper function.

Objective To study the biomechanical properties of porous titanium cages used for different lumbar interbody fusion surgeries. Methods The three-dimensional (3D) finite element model of the lumbar spine was constructed, and mechanical parameters of porous materials were obtained by mechanical test. The biomechanical properties of porous titanium cages in anterior lumbar interbody fusion (ALIF), posterior lumbar interbody fusion (PLIF), transforaminal lumbar interbody fusion (TLIF), direct lateral interbody fusion (DLIF) were compared. Results After lumbar interbody surgery, the predicted range of motion (ROM) and the maximum stress in cage of DLIF model and ALIF model were substantially lower than those of PLIF model and TLIF model. The maximum stress in endplate of DLIF model, ALIF model and TLIF model were obviously lower than that of PLIF model. Conclusions DLIF with the porous cage showed advantages in biomechanical properties, which was simple to operate and suitable for minimally invasive surgery in clinical practice. DLIF performed the superior comprehensive properties.

Aiming at the background and significance of biomechanical researches on lumbar interbody fusion, the research progress of interbody cage and interbody fusion was reviewed and its prospect was forecasted. The related work was summarized, including research method of lumbar biomechanics, biomechanics of interbody cage, and biomechanics of lumbar interbody fusion. The main research directions on biomechanical study of lumbar interbody fusion were: modeling refinement of finite element method， geometrical optimization of traditional fusion device, clinical application of new porous fusion device, and diversification of the supplemented fixation method. Finally, the prospect of biomechanics of lumbar interbody fusion was discussed. The review and prospect on biomechanics of lumbar interbody fusion will provide references for clinical treatment of lumbar spine diseases.

The research progress of finite element method (FEM) applied in biomechanics of lumbar fusion and artificial lumbar disc replacement was reviewed and its prospect was forecasted. The main research directions of FEM are optimal selection of operation plans before the surgery, performance evaluation of implanted devices and prediction of postoperative outcomes. Based on the recent research progress, the application prospects of FEM in simulation of personalized surgery, evaluation of elastic implants and postoperative prediction of novel operation method were discussed. By reviewing and prospecting the application of FEM in biomechanical research of lumbar fusion and artificial lumbar disc replacement, the purpose of this paper is to provide theoretical references and practical guidance for the treatment of lumbar diseases in clinic.