Objective To evaluate the clinical efficacy of universal self-locking anatomical plate for acetabulum and pelvis (USAPAP) in the treatment of posterior acetabular fractures.Methods Data of 55 patients with posterior acetabular fractures who were treated with the USAPAP from January 2014 to January 2016 were retrospectively analyzed.There were 39 males and 16 females with an average age of 38.5 years old (range,17-82 years).There were 35 fractures on the left side while the other 20 fractures were on the right side,including 52 fresh cases and 3 old cases.According to Letournel-Judet classification,there were 32 cases of posterior wall,9 cases of transverse and posterior wall,5 cases of anterior column and posterior wall,2 cases of posterior column,2 cases of transverse,2 cases of two columns,1 case of anterior column and posterior hemitransverse,2 cases of Pipkin type Ⅳ.All patients were managed operatively by the USAPAP,which allows simultaneous fixation for two columns and quadrilateral surface fractures through a single Kocher-Langenback approach.The quality of reduction was assessed by Matta's score system.The mean follow-up period was 18.5 months (range,12-24 months).Average operation time was 95 min,and average blood loss was 350 ml.Average operation time of plate and screws fixation was 19 min,and average fluoroscopy times in the surgery was 2 times.The mean time of bony union was 4.3 months.According to the criteria described by Matta,the excellent and good rate of radiological score was 92.7％ (51/55),including 39 cases excellent,12 cases good and 4 cases poor.The excellent and good rate of Merle d'Aubigne-Postel score was 87.3％ (48/55),including 35 cases of excellent,13 cases of good,5 cases of fair,and 2 cases of poor.Heterotopic ossification occurred in 1 patient (Brooker type Ⅱ) at three months postoperatively.One case with Pipkin type Ⅳ fracture underwent total hip arthroplasty due to femoral head necrosis at seven months postoperatively.Complications including wound infection,sciatic nerve injury,screw invade joint,redisplacement of the fracture,avascular necrosis of bone fragment,hardware failure,nonunion or malunion was not found in any case at the latest follow-up.Conclusion The USAPAP through the single posterior Kocher-Langenback approach provides strong and stable fixation for complex acetabular fractures associated with posterior region including posterior wall,both columns and quadrilateral surface.Satisfactory clinical results can be achieved by the use of this method.

Objective To evaluate the feasibility and safety of performing endoscopic retrograde cholangiopancreatography (ERCP) assisted by single-balloon enteroscopy (SBE) in patients with biliary obstruction after gastrointestinal reconstruction.Methods Clinical data about 7 cases of single-balloon enteroscopy assisted-ERCP (SBE-ERCP) were summarized including the completion of treatment,operation time,and complications for retrospective study.Results The papilla or anastomotic site was reached and therapeutic ERCP were performed successfully in 6 patients.The overall success rate was 85.7％ (6/7),and the mean operation time of SBE-ERCP was 42 min (ranging from 28 to 72 min).The afferent loop and papilla were failed to be confirmed in 1 patient.No complication such as perforation,pancreatitis or bleeding ocurred in all the 7 patients.Conclusion Single-balloon enteroscopy assisted-ERCP (SBE-ERCP) is feasible and relatively safe in postsurgical patients with gastrointestinal reconstruction.

Objective:To study the influencing factors of postoperative complications in patients with malignant biliary obstruction treated by endoscopic radiofrequency ablation(RFA).Methods:Data of patients with malignant biliary obstruction who underwent endoscopic RFA at the Department of Gastroenterology, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine from January 2010 to June 2021 were retrospectively analyzed. There were 62 males and 48 females, with age (74.1±11.1) years. Based on occurrence of postoperative complications, these patients were divided into the complication group ( n=18) and the control group ( n=92). Univariate and multivariate logistic regression analysis were used to analysis the influencing factors of complications. Results:RFA was successfully performed in 110 patients with malignant biliary obstruction, and the technical success rate was 100.0% (110/110). Postoperative complications occurred in 18 patients (16.4%), including 12 patients with of biliary tract infection (8 patients with acute cholangitis, 4 patients with acute cholecystitis) and 6 patients with acute pancreatitis. All these patients responded well to treatment. The proportion of patients who developed complications having associated diabetes, bile duct stenosis length >2.5 cm, fractional RFA for bile duct stenosis, and single stent drainage were significantly higher than those in the control group (all P<0.05). Multivariate logistic regression analysis showed that the risk of complications after endoscopic RFA was significantly increased in patients with diabetes ( OR=6.967, 95% CI: 1.256-38.658) and fractional RFA of bile duct stenosis ( OR=8.297, 95% CI: 1.526-45.122), while the risk of complications after multiple stents drainage ( OR=0.037, 95% CI: 0.008-0.169) was significantly decreased (all P<0.05). Conclusion:Diabetes and fractional RFA of bile duct stenosis were risk factors for complications after endoscopic RFA of malignant biliary obstruction. Multiple stents drainage was a protective factor. Better clinical attention should be paid to the patients with high risk factors.

Objective:To explore the preventive effects of pancreatic duct stent combined with rectal administration of indomethacin suppository for post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP) after difficult bile duct intubation during endoscopic retrograde cholangiopancreatography (ERCP).Methods:From January 2019 to December 2021, patients with biliary and pancreatic diseases undergoing ERCP in Hangzhou Hospital Affiliated to Nanjing Medical University were given 100 mg indomethacin suppository to anal canal 30 minutes before the operation. And those with difficult bile duct intubation during the operation ( n=204) were included in this study. According to the random number table, they were divided into the combination group (implanted with pancreatic duct stent during the operation, n=104) and the indomethacin group (not implanted with stent, n=100). The incidences of hyperamylasemia and PEP were compared between the two groups. Results:The incidences of postoperative hyperamylasemia [21.2% (22/104) VS 34.0% (34/100), χ2=4.22, P=0.040] and PEP [14.4% (15/104) VS 32.0% (32/100), χ2=8.88, P=0.003] in the combination group were significantly lower than those in the indomethacin group. There was no significant difference in the incidence of severe PEP between the two groups [1.0% (1/104) VS 1.0% (1/100), χ2=0.001, P=0.978]. Conclusion:Compared with rectal administration of indomethacin suppository alone, the incidences of hyperamylasemia and PEP after difficult bile duct intubation during ERCP can be further reduced when it is combined with pancreatic duct stent placement.