Objective To study the effects of various doses of ionizing radiation on the osteoinductive activity of recombinant human bone morphogenetic protein 2 (rhBMP-2) and the role of collagen carrier. Methods BMP complex was prepared with rhBMP-2 and collagen sponge as a carrier. The osteoinductive activity of rhBMP-2 was evaluated by heterotopic bone formation. According to the conditions of gamma irradiation, the experiments were divided into 4 groups: (Ⅰ) non-irradiated complex as control; (Ⅱ) irradiated complex with 15, 20, 25 or 50 kGy; (Ⅲ) irradiated carrier: collagen sponge was irradiated with 50 kGy and then mixed with non-irradiated rhBMP-2; (Ⅳ) irradiated BMP: only rhBMP-2 was irradiated with 25 or 50 kGy and then mixed with non-irradiated collagen sponge. The BMP complexes were implanted into thigh muscle pouches in 34 Wistar rats, respectively. All collagen mass in muscle pouches were procured two or four weeks after implantation and examined macroscopically, radiographically and histologically. Quantitative analyses of heterotopic bone formation were evaluated by histomorphometry. Results Two weeks after implantation, collagen mass procured from muscle of irradiated complexes with 15, 20, 25 kGy are almost the same with that of control in size, shape and new bone formation, which are composed with richly vascularized connective tissue and immatured woven bone, but only the quantity of new bone in the group of 25 kGy reduced significantly(P

Ojective To study the probability of laparoscopic adrenalectomy in the treatment of adrenal benign tumor. Methods Laparoscopic adrenalectomy were used to treat pheochromocytoma and primary aldosteronism. Results Average operation time was 200 min and average bleeding was 110 ml. The patients began to walk two days after operation. Hyperension and low blood potassium level syndrom disappeared gradually. Conclusions Laparoscopic Adrenalectomy has the advantage of minimal invasion, faster recover from operation, shorter hospitolized days and higher quarlity of life after operation for the patients.

Objective To evaluate the treatment of ureteral stones with pneumatic lithotripter under ureterscopy and the prevention of complications. Methords 43 cases of ureteral stones that had been treated with pneumatic lithotripter under ureteroscopy was reviewed. Results 93.0%(40/43)of the stones were fragmented on one session,93.0%(40/43)of the stones were expelled within 7 days afer the procedure.No complications occurred. Conclusions Treatment of ureteral stones with pneumatic lithotripter under ureterscopy is safe and effecive.

Objective To investigate the effect of minimally invasive percutaneous nephrolithotomy(MPCNL) in the management of renal or ureteral calculi.Methods MPCNL was performed in 52 patients with renal or ureteral calculi under the localization of C-arm fluoroscopy and/or B-ultrasonography.Results Among the 52 patients,a conversion to open surgery was needed in 1 patient because of perforation of the renal pelvis.The stones were completely extracted on one session in 33 patients,and by a re-operation of MPCNL through the fistulization tube 1 week later in 15 patients.The total stone-free rate was 92.3%.The operation time was 1.5~4 h(mean, 2.5 h).No blood transfusion was needed.Conclusions Minimally invasive percutaneous nephrolithotomy is a safe and effective procedure,especially suitable for basic hospitals.

BACKGROUND:The materials for internal fixation of bone allografts have been used in the clinic.However,they are only used in the regions bearing little stress because of low strength.The focus of current studies is how to enhance the fixation strength of the materials to expand application range.OBJECTIVE:To compare the strength difference of cortical bone allografts among different fixation modes and to investigate the possible mechanisms of action.DESIGN,TIME AND SETTING:An in vitro biomechanical experiment was performed at the Laboratory of Biomechanics,Nanhua University between October 2005 and March 2006.MATERIALS:Twenty-seven pieces of cadaveric femurs were included in this study.A total of 45 cortical bone allografts with a size of 110 mm×10 mm×3 mm and 90 bone screws were also used.METHODS:Twenty-seven femurs were made into simulated fracture models and randomized to 3 groups,with 9 models per group:A,B,and C.In the group A,the models were fixed with two cortical bone all6grafts; the models from the groups B and C were fixed with two bone allografts plus 5 bone screws and one bone allograft plus 5 bone screws accordingly.MAIN OUTCOME MEASURES:Biomechanical tests were performed in the above-mentioned 3 groups to measure compressive,bending and torsional stiffness as well as the maximum loads.RESULTS:Different fixation models displayed different mechanical characteristics.The group A exhibited similar compressive stiffness compared to the group B,but the level was significantly higher compared to the group C (P ＜ 0.05).The other two stiffness parameters including bending and torsion were significantly greater in the group A than in the groups B and C (P ＜ 0.05).The maximum loads of compression,bending,and torsion were significantly greater in the group A compared to the group B (P ＜ 0.05) and group C (P ＜ 0.01).CONCLUSION:The strength of bone allograft is highly related to fixation mode. The two bone allografts showed greater strength and stiffness than struts fixed with bone screws,which meet the clinical requirements.

Objective To compare perioperative parameters, as well as the oncological and func-tional results, for laparoscopic radical prostatectomy (LRP) performed via the posterior bladder and anterior bladder approaches. Methods The recorded pre-, peri-, and postoperative parameters and complications, and evaluated the oncological and functional results were collected and compared be-tween the posterior bladder approach (n=25) and the anterior bladder approach (n=34). Results There were no significant differences regarding the preoperative characteristics of the two groups. The mean blood loss, complications, positive surgical margins, and continence showed no significant differences between the 2 groups at 3 and 6 months postoperatively. The mean operation time was sig-nificantly shorter in anterior bladder approach group (174.2±58. 0 min) than in posterior bladder ap-proach group (224. 8±66.7 rain), (P<0. 01). Also, the postoperative recovery time until discharge was 5.9 d in anterior bladder approach group, which was significantly shorter than in posterior bladder approach group (7.5 d) (P<0.05). Conclusion The anterior bladder approach yields shorter oper-ation time and postoperative recovery period than posterior bladder approach for LRP.

Objective To explore the way to reduce the absorption of irrigating fluid during PCNL. Methods The amount of absorbed fluid during PCNL in 20 cases (13 males and 7 females)was monitored by ethanol method. The average age was 40 years old. The maximum diameter of calculi by average was 25 mm. Heart rate and mean arterial pressure were monitored during operation.Haemoglobin concentration, serum Na+, K+, Cl-, carbon dioxide-combining power and serum creatinine were measured before and after operation. The amount of irrigating fluid, the duration of operation, and the intrapelvic pressure were recorded. Results The absorbed volume of irrigating fluid in 20 cases was from 50. 2 to 685.0 ml. There was no significant difference in heart rate, mean arterial pressure, serum Na+ , K+ , Cl- and serum creatinine between pre-operation and post-operation(P>0.05), but the postoperative haemoglobin concentration (130.4±16.3 g/L) and carbon dioxide-combining power (24.1±3.2 mmol/L) were lower than that before operation( 142.6±15.6 g/L,26.4±2.0 mmol/L), the differences were significant (P<0. 05). The mean volume of absorbed irrigating fluid in patients with the cumutative time of the intrapelvic pressure higher than 30 mm Hg >10 min,the duration of operation >1 h, or the amount of irrigating fluid >10000 ml was 381. 1, 301.6,261.6 ml respectively, which was higher than that in the other cases (142.9, 136.4, 130.2 mi), the differences were significant (P<0.05). Conclusions The ethanol method is simple, convinent,safe, valid, and is suitable for patients with compromised cardiorespiratory or renal function, who are more likely to develop volume overload because of fluid absorption.

Objective:To observe the therapeutic effect and mechanism of Huzhangyuzhuo decoction on treating chronic pelvic pain syndrome(CPPS).Methods:46 male Wistar rats were randomly divided into control group(n=10) and experiment group(n=36).The CPPS rat model was induced by intraperitoneal injection of diphtheria-pertussis-tetanus vaccine and subcutaneous injection of puri ed prostate protein with FCA suspension.Rats in experiment group were subdivided into model group,Chinese medicine group and western medicine group(n=12).After 30 days of treatment,pathology changes of prostate were observed,and levels of IL-1?,COX-2,PGE2,?-EP in prostate homogenate were measured by ELISA.Results:Huzhangyuzhuo decoction greatly reduced the in ammation of prostate and relieved the structure damage.At the same time,Huzhangyuzhuo decoction can decrease the level of IL-1?,COX-2,PGE2 and increase level of ?-EP.Conclusions:Huzhangyuzhuo decoction might treat CPPS by regulating of cytokines in the prostate,depressing in ammation and relieving structure damage.

Objective To explore the dysfunction of dendritic cells (DC) related to TGFβ reversed after blocking the TGFβ signal pathway by recombinant adenovirus vector encoding for Smad7.Methods Smad7 by recombinant adenovirus vector was transfected into dendritic cells.Expression of immunologic phenotypes was detected by FCM,and CTL activity induced by DC was compared.Results The DC modified with Smad7 still expressed high adhesiveness factor related to maturation even if existing exogenous TGFβ1,which was significant statistically compared with DC transfected with control adenoviral vector (P ＜0.01).Even if existing exogenous TGFβ1,the DC modified with Smad7 pulsed with soluble antigen associated with Lewis pulmonary carcinoma could still induce potent CTL activity against Lewis pulmonary carcinoma,which showed significant difference with DC-Ad-c (P ＜0.01).Conclusion The inhibitory effects on function of DC of TGFβ may be reversed by blocking the Smad signal of TGFβ pathway.

BACKGROUND: Human allogenic acellular dermal matrix, as a kind of permanent dermal scaffold, has widely used in the fields of burn wound reparation and aesthetic medicine. However, it is limited due to insufficient resources. OBJECTIVE: To prepare porcine acellular dermal matrix (PADM) dermal matrix, in addition, to estimate its in vitro biocompatibility. DESIGN, TIME AND SETTING: An in vitro cytology contrast experiment. The Experiment was performed at the laboratory of Biomaterials and Pharmacy Technology Institute, China Institute for Radiation Protection between August 2007 and June 2008. MATERIALS: The experiment pigs were supplied by experimental animal center of China Institute for Radiation Protection. Human fibroblasts were obtained from prepuce tissues of healthy children who underwent circumcision at the Shanxi Provincial General Hospital, Chinese People's Armed Police Forces. METHODS: The PADM was prepared from porcine skin by removing epidermis with a hypertonic salt solution and excluding cellular components in dermis with sodium dodecyl sulfate, and trypsin in hypersonic conditions. Human fibroblasts were cultured in vitro, and the biocompatibility of PADM was estimated with MTT method and contact method. MAIN OUTCOME MEASURES: ①Histological morphology of PADM. ②In vitro biocompatibility of PADM. RESULTS: The prepared PADM was a kind of matrix with normal structure and organization of collagen without epidermis and any cellular components in the dermis. The extraction of the porcine acellular dermal matrix had no effect on proliferation of the cultured human fibroblast. The cultured human fibroblasts could attach and proliferate on PADM. CONCLUSION: The PADM effectively removed epidermis and all cellular components with excellent biocompatibility can be obtained by this preparation method.