Effects of plasma treatment time on modification of acrylic denture material

Objective：To study the relationship between plasma treatment time acrylic resin denture material in the size of 2 mm × 10 mm × 10 mm. and efficacy. Methods：Test specimens were prepared from an Plasma treatment was carried out on the surface of Polymethyl methacrylate（PMMA） at different time. XPS studies, IR spectra studies and measurement of wetting angle were performed. Results： XPS showed the peak corresponding to C-O getting higher as the treatment proceeded, however at 120 seconds, the peak did not increase any longer and partly crossed with the peak at the duration of 60 seconds. IR spectra showed the wave corresponding to C-H was reduced as O2-plasma treatment proceeded, and then changed little, Wetting angle initially decreased dramatically, however, as the reaction proceeded, wetting angle increased slightly. Conclusion：Equilibrium was reached for introducing oxygen-containing groups and changing of C-H. As the treatment proceeded, wetting angle increased slightly.     

121例颈部瘢痕挛缩治疗分析

目的探讨颈部烧伤瘢痕挛缩的手术治疗方法及效果。方法本组121例烧伤后颈部瘢痕挛缩患者(无1例为新鲜烧伤),根据病情程度分别采用"Z"成形术、厚皮片移植术、"Z"成形加厚皮片移植术、邻位皮瓣移植术和邻位皮瓣加皮片移植术进行手术整复。对于烧伤后颌颈瘢痕严重挛缩的患者,采用仅对挛缩瘢痕切开松解而不切除的手术方法,灵活设计切口,利用挛缩部位已成熟的瘢痕形成较大面积三角形瘢痕瓣来修复创面;切口解剖深度直达舌骨甲状软骨沟平面并彻底松解挛缩组织,以塑造明显的颌颈角。结果本组121例患者的瘢痕挛缩得到最大程度的松解,均获得满意或较为满意的近期疗效。患者颈部活动自如,外观改善显著,颌颈角明显。结论对于供皮区缺乏的严重颈部瘢痕挛缩的患者,利用特殊切口及设计面积较大的瘢痕瓣修复部分创面,同样可获得满意疗效;切口解剖至舌骨甲状软骨沟深度,并彻底松解所有挛缩的软组织,可显现较为美观的颌颈角。     

单侧经皮椎体后凸成形术治疗老年骨质疏松性胸腰椎压缩性骨折的疗效分析

目的 探讨单侧经皮椎体后凸成形术治疗老年骨质疏松性胸腰椎压缩性骨折的临床疗效。方法 选取2018年1月至2021年2月中国人民解放军南部战区空军医院收治的老年骨质疏松性胸腰椎压缩性骨折患者67例为研究对象,患者均采用单侧经皮椎体后凸成形术治疗,比较患者手术前后疼痛视觉模拟评分法（visual analogue scale,VAS）评分、伤椎椎体高度、Cobb角变化,评价骨水泥注入量与术后2d椎体高度恢复值和疼痛VAS评分的相关性。结果 所有患者手术顺利完成,平均手术时间（31.5±10.8）min,骨水泥注入量（4.7±0.9）ml。随访6～24个月,无症状复发及椎体高度严重丢失者,未发现相邻椎体再骨折病例。5例患者术中发生骨水泥渗漏。术后2d、术后6个月及术后12个月患者的VAS评分、Cobb角均显著低于术前（P<0.05）,椎体高度均显著高于术前（P<0.05）。骨水泥注入量与术后2d椎体高度恢复值和疼痛VAS评分均无显著相关性（P>0.05）。结论 单侧经皮椎体后凸成形术治疗老年骨质疏松性胸腰椎压缩性骨折效果明显,术后患者疼痛明显缓解,椎体高度恢复良好,后凸畸形矫正满意。     

相位角在结直肠癌手术患者营养评估及预后预测中的应用

目的探讨生物电阻抗相位角（phase angle, PA）在结直肠癌（colorectal cancer, CRC）手术患者营养评估及预后预测的应用。方法选取同济大学附属第十人民医院胃肠外科241例CRC手术患者,入院时采用营养风险筛查2002（Nutrition Risk Screening 2002, NRS 2002）、患者主观整体评估量表(Patient Generated-Subjective Global Assessment, PG-SGA)、全球领导人发起的营养不良倡议（Global Leadership Initiative on Malnutrition, GLIM）行营养筛查与评估,完善人体成分测定,同时收集相关营养指标及预后指标,评价PA在营养评估及预后预测的应用。结果与正常PA组相比,低PA组体质量指数（body mass index, BMI）、骨骼肌质量指数（skeletal muscle mass index, SMI）、前白蛋白（serum prealbumin, PALB）、总蛋白（total protein, TP）、白蛋白（albumin, ALB）、血红蛋白（hemoglobin, HGB）、预后营养指数（prognostic nutritional index, PNI）呈下降趋势（P<0.05）,而年龄、纤维蛋白原（fibrinogen, FBG）、中性粒细胞/淋巴细胞比值（neutrophil/lymphocyte ratio, NLR）、血小板/淋巴细胞比值（platelet-to-lymphoccyte ratio, PLR）呈上升趋势（P<0.05）。营养风险及营养不良的患者PA明显下降（P<0.05）。PA与NRS 2002、GLIM存在一致性（P<0.05）。PA与年龄、FBG、NLR、PLR、NRS 2002、PG-SGA、改良格拉斯哥预后评分（modified Glasgow Prognostic Score, mGPS）、GLIM呈负相关,与BMI、SMI、PALB、TP、ALB、HGB、PNI呈正相关（P<0.05）。多元线性回归分析显示年龄、SMI、PALB、HGB、PNI、mGPS及GLIM对CRC手术患者的PA影响差异有统计学意义（P<0.05）。结论PA与CRC手术患者营养状况及预后指标密切相关,有利于辅助识别营养不良及预测预后,为及时进行营养干预及改善预后提供依据。     

螺旋管强化传热的CFD模拟与优化

在长度500 mm的螺旋管中,采用计算流体动力学（CFD）技术对椭圆形螺旋管、圆形螺旋管和旋转角螺旋管的传热性能进行了模拟计算。计算结果表明,旋转角螺旋管具有较好的传热性能。在旋转角螺旋管中有0°、15°、30°、45°、60° 5种不同的旋转角结构,其中以30°旋转角螺旋管的传热性能最好。以30°旋转角螺旋结构为基础,模拟了24°、26°、28°、32°、34°、36°等不同的旋转角螺旋结构,得到32°旋转角螺旋结构为最优,该结构螺旋管的出口温度比椭圆形螺旋管提高了19.50%,比0°旋转角螺旋管提高了11.68%。同时通过对椭圆形螺旋结构、圆形螺旋结构和32°旋转角螺旋结构进行压力和速度模拟,计算结果显示32°旋转角螺旋结构有更佳的压力分布和速度分布。     

乳突后小骨窗开颅骨片复位显微手术切除大型桥小脑角肿瘤

目的 探讨大型桥小脑角肿瘤经乳突后小骨窗开颅、骨片复位的手术方法 及其治疗效果.方法 18例大型桥小脑角肿瘤(听神经鞘瘤13例,脑膜瘤3例,胆脂瘤2例)均采用单侧乳突后小骨窗开颅,应用显微神经外科技术进行肿瘤切除,必要时磨开内听道,术中行脑干听觉诱发电位(BAEP)、体感诱发电位(SEP)和面神经功能监测,肿瘤切除后严密缝合硬脑膜,骨片复位.结果 肿瘤全切除17例、次全切除1例.全组患者的面神经均得到了解剖保留.无手术死亡.术后复查MRI示17例肿瘤全切除者未见有肿瘤残留,1例听神经鞘瘤行次全切除者于内听道内可见少许肿瘤组织残留,术后3个月行伽玛刀治疗.术后有10例遗留轻度面瘫(口角稍有歪斜,眼睑闭合良好),均为大型听神经鞘瘤患者,余患者无脑神经功能障碍,恢复良好.结论乳突后小骨窗开颅术适用于不同大小的桥小脑角肿瘤,严格按显微神经外科技术操作,结合术中BAEP,SEP和面神经功能监测,均可做到肿瘤全切除,并能有效地保护肿瘤周围的重要神经结构及其功能.严密缝合硬脑膜和骨片复位可消除局部皮下积液.     

老年转子间骨折角型钢板治疗失误和并发症分析

目的分析角型钢板治疗股骨转子间骨折中出现的各种失误和并发症,并提出预防措施。方法1990年10月以来共治疗股骨转子间骨折68例,逐例分析治疗失误的原因。结果术中操作失误致股骨外侧皮质崩裂2例;钢板刀口穿破股骨头进入髋臼1例,术后切口感染1例,共8例出现并发症,发生率14．7％。结论角型钢板治疗股骨转子间骨折效果好,但不应忽视可能发生的各种失误和并发症。     

Comparison of screw fixation versus non-fixation in dorsal opening wedge medial cuneiform osteotomy of adult acquired flatfoot

BackgroundThe aim of this study was to compare the radiographic and functional results between fixation and non-fixation in the Cotton osteotomy for the treatment of adult acquired flatfoot.MethodsA retrospective, case-controlled study of consecutive stage IIB posterior tibial tendon dysfunction (PTTD) patients treated with the same bony reconstructive surgery including cotton osteotomy between 2013 and 2017. Meary’s angle, the medial arch sag angle (MASA), and medial cuneiform cobb angle (MCCA) were evaluated pre-operation, at first weight bearing after surgery, and 12 months post operation.ResultsForty feet were included in the study. The cotton osteotomy utilized screw fixation (n = 20) or non-fixation technique (n = 20). No significant differences between groups were found in pre-operative and follow-up radiographic parameters, union rate, and functional results.ConclusionThe non-fixation with press fit technique is a reliable procedure for Cotton osteotomy and as effective as screw fixation.Level of evidenceLevel III, case control study     

Central Implantation of the Femoral Component Relative to the Tibial Insert Improves Clinical Outcomes in Fixed-Bearing Unicompartmental Knee Arthroplasty

BackgroundThe direct relationship between clinical outcomes and femoral component positioning relative to a tibial insert remains unknown. We determined whether the femoral component position relative to the tibial insert could affect clinical outcomes after fixed-bearing unicompartmental knee arthroplasty (UKA).MethodsThe femoral component position relative to the tibial insert of 66 patients with anteromedial osteoarthritis and osteonecrosis of the knee who underwent fixed-bearing UKA was assessed at 2 weeks postoperatively. We classified patients according to the contact point of the femoral component with the tibial component: group M (medial), 18 knees; group C (central), 30 knees; and group L (lateral), 18 knees. Patient-derived clinical scores using the 2011 Knee Society Score were also assessed preoperatively and at 2 years postoperatively and compared among the 3 groups using the analysis of variance.ResultsThe average 2-year postoperative “symptom” and “patient satisfaction” scores based on the 2011 Knee Society Score were significantly higher in group C than in group M or group L.ConclusionCentral implantation of the femoral component relative to the tibial insert plays an important role in decreasing pain and could result in better patient satisfaction after fixed-bearing UKA at 2 years postoperatively. Surgeons should set the femoral component at the center relative to the tibial insert for better patient satisfaction and higher active knee flexion after fixed-bearing UKA.     

推拿对颈椎病患者等速运动中最大力矩角度的影响*

[目的]探讨正常人和颈椎病患者颈部肌肉最大力矩角度(APT)的特征及推拿干预机制.[方法]采用等速肌力测仪评估等速运动状态颈椎病颈部肌肉APT特性,分颈椎病组(40例)和正常对照组(39例),每组按性别、年龄相匹配分青、中和老年3个亚组.推拿治疗10次,分别在推拿治疗前、第1次推拿后即刻及第10次以后进行评估.[结果]正常人APT值比较恒定,随年龄改变不明显,90°/s角速度前屈和后伸APT多位于距离中立位偏后10°～25°,25°～40°;180°/s角速度前屈和后伸APT多分别位于距离中立位偏后15°～20°,20°～30°;颈椎病患者后伸APT值与正常人有显著差异,其值多位于中立位前后10°左右;推拿可以改善最大力矩角度,尤其是后伸APT值.[结论]正常人可以作为评估颈椎病颈部肌肉功能的有效参数;推拿可以通过改善以整体恢复颈部肌肉的力学平衡.