AIM:To analyze the cause of hip prosthesis dislocation,so as to prevent the dislocation following total hip arthroplasty(THA).METHODS:Between January 2002 and June 2007,a total of 348 cases(406 hips) received THA in the Department of Orthopaedics,the Second Affiliated Hospital of Fujian Medical University,and 15 patients(15 hips) occurred dislocation(3.7%),including 6 males and 9 females.Their age ranged 35-76 years,with a mean of 58 years.Primary affections consisted of femoral neck fracture in 3 cases(one with dislocation rebuilding after THA),femoral necrosis in 5 cases,hip arthodysplasia in 5 cases,and osteoarthritis in 2 cases.THA was carried out through lateral approach in 8 patients,and posterior lateral approach in 7 patients.The first dislocation occurred in 2 patients within 2 weeks,3 patients during 2-4 weeks,6 patients during 4-6 weeks,3 patients during 6-12 weeks,and 1 patient 12 weeks later.The movement of dislocation occurrence includes moving the patients in 2,turning over in 2,turning around in 4,trying to stand from sitting in 3,sock wearing in 3,and picking up in 2.It was revealed in the clinical analysis and operational incision that anterior dislocation was found in 6 cases,while posterior dislocation in 9 cases;proper placement of prosthesis in 5 cases,while incorrect placement in 10 cases.Close reduction was conducted in short time after dislocation,achieving success in 11 cases.There were 4 cases treated with open reduction after failure of close reduction,and hip joints were restricted.Seven patients were found dislocation again.And four patients prolonged external fixation and 3 patients were performed revision.RESULTS:The follow-up period ranged from 10 to 60 months.Eight cases succeeded the first reduction,with good joint stability and without relapse.Redislocation occurred in 4 cases,and was cured by prolonging fixation.No cases following revision were found dislocation.The average score was(85?5) according to Harris scoring system.There was no biocompatibility between the materials and the host.CONCLUSION:We should emphasize prevention of dislocation in the early THA and enough fixation time after reduction.

Helicobacter pylori (Hp) is a microaerophilic Gram-negative bacterium that colonizes the gastric mucosa. After colonization, many proteins expressed by Hp, such as Helicobacter pylori urease (HPU), neutrophil-activating protein (NAP), outer membrane protein (OMP), cytotoxin-associated gene A (CagA) and vacuolating cytotoxin A (VacA), may serve as antigens to mediate neutrophil chemotaxis. Thereafter, neutrophils infiltrate in gastric mucosa and play roles in mucosal immunity via secreting cytokines and releasing reactive oxygen species (ROS) and myeloperoxidase (MPO). This article reviewed the advances in study on the role of neutrophil infiltration in Hp infection-related diseases.

Objective : To analyze and verify the factors influencing the prediction model of suicidal ideation of burn patients in hospital based on international scale． Methods : The clinical data of 194 burn patients treated in hospi- tal were retrospectively analyzed．General data questionnaire，ISI，HAMD，HAMA，ASDS and BSHS-B were used to evaluate the influencing factors of suicidal ideation．According to the presence or absence of suicidal ideation， the patients were divided into the suicidal ideation group and the non-suicidal ideation group．The baseline data be- tween the groups were compared，univariate screening of meaningful variables was conducted，and multivariate Lo- gistic regression modeling was further conducted. ROC analysis evaluated model differentiation，and internal verifi- cation was conducted. Results : According to the baseline data analysis results，there were no statistically signifi- cant differences in age，BMI，years of education，smoking history，estimated percentage of burned area，head and neck burns，hip and perineal burns，and pain scores in the suicidal ideation group (21 /194) compared with the non-suicidal ideation group ( 173 /194) ．Gender (P = 0. 047) ，presence or absence of trunk burn (P = 0. 022) ， severity of burn ( moderate burn : P = 0. 002 ; severe burn : P = 0. 458 ; extremely severe burn : P = 0. 169) ，ISI score (P = 0. 001) ，HAMD score (P = 0. 001) ，HAMA score (P＜0. 001) ，ASDS score (P = 0. 003) ，BSHS-B score (P = 0. 011) had statistical significance．Multivariate Logistic regression analysis showed that the severity of burn (moderate burn : OR = 0. 103，P = 0. 009 ; severe burn : OR = 0. 351，P = 0. 223 ; extremely severe burn : OR = 0. 103，P = 0. 095) and HAMA score ( OR = 1. 136，P = 0. 007) were independent influencing factors for burn patients with suicidal ideation 。The Logistic regression prediction model was established by two independent influ- encing factors. ROC analysis results showed that the model had good differentiation ( AUC = 0. 880，95% CI : 0. 808 －0. 952 ，P ＜0. 001 ) and the internal verification accuracy was 79. 38%． Conclusion The prediction model built on the basis of two independent influencing factors，burn severity and HAMA score，has a good predic- tion accuracy，which is helpful for clinicians to intervene as soon as possible for burn patients with suicidal ideation in hospital，in order to reduce the incidence and enrich clinical psychological research.