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| 1 | Precontoured buttress plate vs reconstruction plate for acetabulum posterior wall fractures: A biomechanical study显示文摘BACKGROUND The purpose of open reduction and internal fixation of acetabulum posterior wall fractures is to restore anatomical structure and stability of the hip joint, in order to start weight bearing as soon as possible and prevent hip arthrosis; restoration of the anatomy should preserve function of the joint as well. Although 'special shaped precontoured plates' have been developed in recent years for surgical treatment of this region, studies comparing the traditional plates with the newly designed precontoured plates are lacking.AIM To evaluate the biomechanical properties of precontoured anatomic buttress and conventional curved reconstruction plates(CCRPs) for posterior wall acetabulum fracture treatment.METHODS Twelve pelvis models were created for testing plate treatment of fracture in the posterior wall of the acetabulum. These 12 pelvis models were used to create 24 hemipelvis models(experimental) by cutting from the sagittal plane and passing over the center of gravity, after which the posterior wall acetabular fractures(of similar type and size) were created. In these experimental models, the right acetabulum was fixed with a 5-hole CCRP, while the left was fixed with a precontoured anatomic buttress plate(PABP). Samples were placed through thetest device and were subjected to static load testing, with a constant testing velocity of 2 mm/min until the load reached 2.3 kN or the acetabular fixation failed. Dynamic tests were also performed with sinusoidal wave load, with a maximal load of 2.3 kN and a load ratio of 0.1.RESULTS The average stiffness values were 460.83 ± 95.47 N/mm for the PABP and 291.99± 118.58 N/mm for the 5-hole CCRP. The precontoured anatomic acetabulum buttress plates had significantly higher rigidity than the CCRPs(P = 0.022). There was a statistically significant difference between the unloaded and 2.3 kN-loaded values of AL(posterosuperior fracture line vertical to the ground surface) and CL(posteroinferior fracture line vertical to the ground surface) parameters for both the PABPs and the 5-hole CCRPs(P = 0.036 and P = 0.045, respectively).According to the static tests, the amount of total displacement was significantly less in the PABPs than in the CCRPs. Comparative analysis of the displacement in the BL(posterior wall fracture line horizontal to the ground) parameter yielded no statistically significant differences between the PABP and the 5-hole CCRPs(P= 0.261).CONCLUSION PABP provides more stable fixation in acetabulum posterior wall fractures than5-hole CCRP, allowing for proximal or distal fracture line screw application without reshaping. | Güray Altun Gürsel Saka Teyfik Demir Fatma Kübra Erbay Elibol Mehmet Or?un Polat | 2019 | World Journal of Orthopedics2019，10，5： | 3 |
| 2 | Circadian blood pressure pattern and cardiac autonomic functions:different aspects of same pathophysiology显示文摘 | Okutucu S Karakulak UN Kabakci G | 2011 | Anadolu Kardiyol Derg2011，11，2： | 1 |
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| 5 | Metabolic form ationof DHP- derived DNA adducts from a representativeotonecine type pyrroliz- idine alkaloid clivorine an d the extract of Ligularia hodgsonnii Hook 显示文摘 | XIA Q CHOU M W UN G | 2004 | Chem Res Toxicol2004，17，5： | 1 |
| 6 | Prognostic importance of physical examination for heart failure in non-ST-elevation acute coronary syndromes: the enduring value Killip classification 显示文摘 | Khot UN Jia G Molitemo DJ | 2003 | JAMA2003，290，22： | 1 |
| 7 | Mechanisms of human eosinophil activation by complement protein C5a and plateletactivating factor: similar functional responses are accompanied by different morphologic alterations 显示文摘 | Zeck-Kapp G Kroegel C Riede UN | 1995 | Allergy1995，50，1： | 1 |
| 8 | Primary cardiac sarcoma显示文摘 | Khadilkar UN Harish R Tantry G | 2008 | Indian J Pathol Microbiol2008，51，1： | 1 |
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| 10 | Prognostic importance of physical examination for heart failure in non - ST - elevation a- cute coronary syndromes:the enduring value of Killip classifica- tion显示文摘 | Khot UN Jia G Moliterno DJ | 2003 | JAMA2003，290，16： | 1 |
| 11 | Safety and tolerability of chikungunya virus-like particle wtccinc in healthy adults: a phase 1 dose-escalation trial 显示文摘 | Chang 1-3 Dowd KA Mcndoza FH Saundcrs JG Sitar S Plummet SH Yamshchikov G Sarwar UN Hu Z Enama ME Bailer RT Koup RA Schwartz RM Akahata W Nabel GJ Mascola JR Pierson TC Graham BS Ledgerwood JE VRC 311 Study Team | 2014 | Lancet2014，384，9959： | 1 |
| 12 | Radial artery bypass grafts have an increased occurrence of angiographically severe stenosis and occlusion compared with left internal mammary arteries and sa- phenous vein grafts显示文摘 | Khot UN Friedman DT Pettersson G | 2004 | Circulation2004，109，17： | 1 |
| 13 | Tracking control for switched linear systems with time-delay: a state-dependent switching method 显示文摘 | LI Qing-kui ZHAO un Dimirovski G M | 2009 | Asian Journal of Control2009，11，5： | 1 |
| 14 | Prognostic importance of physical examination for heart failure in non - ST- elavation acute coronary syndromes:The enduring value Killip classification 显示文摘 | Khot UN Jia G Molitemo D J | 2003 | JAMA2003，290，22： | 1 |
| 15 | Treatment of agricultural and domestic effluents in constructed downflow reed beds employing recirculation显示文摘 | S UN G GRAY K R BIDDLFSTONEA J | 1998 | Environmental Technology1998，19，5： | 1 |
| 16 | Combined rough settheory and flow network graph to predict customer churn incredit card accounts显示文摘 | UN C S TZENG G H CHIN Y C | 2011 | Expert Systems with Applications2011，38，1： | 1 |
| 17 | Evolution of precipitates in the Nb-Ti-V microalloyed HSLA steels during reheating 显示文摘 | Hong S G J un H J Kang K B | 2003 | Scripta Materialia2003，48，： | 1 |
| 18 | Role of spectral measures of heart rate variability as markers of disease progression in patients with an-giotensin converting enzyme inhibitors显示文摘 | Pan ina G Khot UN Nunziata E | 2006 | Am Heart J2006，131，1： | 1 |
| 19 | Sulindac enhances tumor necrosis factor-alpha-mediated apoptosis of lung cancer cell lnes by inhibition of nuclear faetor-kappaB显示文摘 | Berman KS Verma UN Harburg G | 2002 | Clin Cancer Res2002，8，2： | 1 |
| 20 | Wideband Bandpass Filter with Wide Stop- band Using Loaded BCMC Stub and Short-Stub显示文摘 | l un X Ma J G Li E P | 2011 | IEEE Microw Willess Compon Lett2011，21，7： | 1 |
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