首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 140 毫秒
1.
目的 探讨后路空心加压螺钉结合抗滑动钢板内固定治疗Letenneur Ⅰ型Hoffa骨折的临床疗效.方法 2006年8月至2009年10月共收治10例Letenneur Ⅰ型Hoffa骨折患者,男7例,女3例;年龄22~61岁,平均40.1岁;左侧6例,右侧4例;均为外髁骨折.受伤至手术时间为3~12 d,平均6.4 d.10例患者均采用后侧人路,以2枚空心加压螺钉由后向前固定,同时使用抗滑动钢板固定,术后进行功能锻炼.结果 10例患者术后获10~18个月(半均12.7个月)随访.所有患者骨折均获骨性愈合,愈合时间为2~5个月,平均3.6个月.按照Letenneur等的Hoffa骨折术后功能恢复评估系统评定疗效:优6例,良3例,差1例.结论 后路空心加压螺钉配合抗滑动钢板内固定治疗Letenneur Ⅰ型Hoffa 骨折具有固定可靠、可早期功能锻炼及膝火节功能恢复好的优点.  相似文献   

2.
8例Hoffa骨折手术治疗临床疗效分析   总被引:2,自引:0,他引:2  
目的探讨手术治疗Hoffa骨折的临床疗效。方法自2011-01—2015-10共诊治8例Hoffa骨折。对于LetenneurⅠ、Ⅱ型骨折采用2或3枚空心拉力螺钉固定;对于LetenneurⅢ型骨折,3例用2枚空心拉力螺钉外加锁定钢板支撑固定,2例用2枚空心拉力螺钉外加横向2枚空心拉力螺钉固定。结果本组8例均获得随访8~37个月,平均20.3月,术后切口均一期愈合,术后3个月骨折均骨性愈合,随访过程未见骨折移位、内固定物失效、骨折不愈合、骨折畸形愈合等并发症。末次随访疗效用Letenneur评估系统进行评定:优4例,良3例,差1例。结论 Hoffa骨折行手术治疗时,对于LetenneurⅠ、Ⅱ型骨折行2或3枚空心拉力螺钉固定,对于LetenneurⅢ型骨折、粉碎性Hoffa骨折或伴有严重骨质疏松症患者加用锁定钢板支撑固定或横向2枚空心拉力螺钉固定,可达到固定牢固、能早期功能练习、术后并发症少、术后效果满意的疗效。  相似文献   

3.
《中国矫形外科杂志》2019,(14):1264-1268
[目的]探讨比较加压螺钉联合支撑钢板技术与单纯加压螺钉技术治疗Letenneur Ⅱ-Ⅲ型Hoffa骨折的临床疗效。[方法] 2008年6月~2018年10月本院收治的42例Letenneur Ⅱ-Ⅲ型Hoffa骨折患者,随机分为两组,21例给予支撑钢板联合拉力螺钉固定,21例采用单纯螺钉固定。比较两组围手术期资料、膝关节活动范围(ROM)、KSS评分及影像资料。[结果]两组患者均顺利完成手术,未发生血管、神经损伤等严重并发症。钢板螺钉组在手术切口长度、出血量、手术时间、术中辐射时间、住院费用方面显著大于单纯螺钉组,差异具有统计学意义(P0.05)。42例患者随访12个月以上。术后完全负重行走时间钢板螺钉组为(10.62±1.60)周,单纯螺钉组为(12.81±2.64)周,两组间差异有统计学意义(P0.05)。两组患者均随术后时间推移,ROM和KSS评分显著增加,差异有统计学意义(P0.05),术后3、12个月随访时,钢板螺钉组ROM和KSS评分均显著大于单纯螺钉组,差异有统计学意义(P0.05)。至末次随访时,钢板螺钉组出现1例骨不连,但内固定物无松动、断裂;单纯螺钉组出现2例畸形愈合,螺钉移位。[结论]尽管在手术时间、切口长度、术中失血量和手术费用方面存有劣势,拉力螺钉联合支撑钢板技术治疗Letenneur Ⅱ-Ⅲ型Hoffa骨折的临床效果优于单纯拉力螺钉固定。  相似文献   

4.
螺钉结合抗滑钢板治疗股骨外侧髁Hoffa骨折   总被引:1,自引:1,他引:0       下载免费PDF全文
目的 :探讨螺钉结合抗滑钢板内固定治疗股骨外侧髁Hoffa骨折的临床疗效。方法 :2006年5月至2014年5月,采用螺钉加抗滑钢板内固定治疗股骨外侧髁Hoffa骨折患者17例,男13例,女4例;年龄27~59岁,平均32.5岁;均为新鲜闭合性骨折。骨折根据Letenneur分型:Ⅰ型8例,Ⅱ型4例,Ⅲ型5例。术后观察切口、骨折愈合时间,并采用Letenneur评估系统及HSS评分系统进行膝关节功能评价。结果:17例患者均获随访,时间10~24个月,平均14.6个月。手术切口均Ⅰ期愈合,未见内固定断裂、骨折畸形愈合及股骨髁坏死、下肢深静脉血栓发生。骨折愈合时间4~9个月,平均4.7个月。采用Letenneur评估系统进行评价,优10例,良4例,可3例;HSS总评分91.1±4.7,优15例,良2例。结论 :螺钉结合抗滑钢板内固定治疗股骨外侧髁Hoffa骨折,固定坚强可靠,疗效优良,有利于骨折愈合及膝关节功能早期康复。  相似文献   

5.
[目的]探讨NICE结固定锁骨中段骨折的生物力学特性。[方法]将60例人体锁骨标本随机分为4组,使用骨科摆锯制作锁骨中段骨折(OTA/AO分型15-A2)模型,分别行拉力螺钉固定,以及2-0线NICE结固定、1-0线NICE结固定和1#线NICE结固定。采用Instron生物力学测试机进行三点弯曲实验,测量各组不同固定方式骨折模型的失效载荷、最大位移及屈服刚度。[结果] 1#线NICE组与拉力螺钉组在失效载荷[(98.4±0.7)N vs (99.0±1.7)N, P>0.05]、最大位移[(10.1±0.4)mm vs (10.0±0.4)mm, P>0.05],以及屈服刚度[(24.4±0.4)N/mm vs (24.5±0.5)N/mm, P>0.05]差异无统计学意义。拉力螺钉组在失效载荷[(99.0±1.7)N,(45.2±0.5)N,(64.8±0.7)N, P<0.05]、最大位移[(10.0±0.4)mm,(9.4±0.6)mm,(5.6±0.5)mm, P<0.05]及屈服刚度[(24.5±0.5)N/mm,(5.0±0.3)N/mm,(...  相似文献   

6.
目的探讨Hoffa骨折的手术方式选择及其临床疗效。方法回顾性分析自2017-01—2018-12采用手术治疗的11例Hoffa骨折,LetenneurⅠ、Ⅲ型骨折采用膝前外侧或前内侧入路,LetenneurⅡ型骨折采用膝后外侧或后内侧入路。6例选用2~4枚皮质骨螺钉或松质骨螺钉内固定,3例选用锁定钢板内固定,2例选用锁定钢板联合空心钉内固定。结果11例均获得随访,随访时间平均14(8~18)个月。术后无感染、内固定松动、骨折不愈合、膝关节僵硬等并发症发生。骨折愈合时间平均13(11~17)周。末次随访时根据Letenneur等的评分标准进行功能评估:优6例,良2例,可2例,差1例。结论因Hoffa骨折特殊的解剖位置及其在X线片上难以清晰显示容易导致漏诊,临床医师应熟悉此类骨折的影像学特点,了解患者的损伤机制,并根据骨折的具体分型采用不同的手术入路,制定更加合理的治疗方案,目前Hoffa骨折采用锁定钢板联合空心钉内固定可获得满意的疗效。  相似文献   

7.
[目的]探讨切开复位内固定治疗Hoffa骨折的方法及临床疗效.[方法]2003年5月-2009年8月,通过前外(内)侧、后外(内)侧入路或联合前后切口,行切开复位、松质骨拉力螺钉内固定术治疗Hoffa骨折7例共7髁,其中男5例,女2例;年龄18~51岁,平均37.5岁.按Letenneur分型:Ⅰ型4例,Ⅱ型0例,Ⅲ型3例.均为闭合性骨折,术后均行石膏外固定.[结果]所有患者术后获10~24个月(平均19.6个月)随访,骨折均获骨性愈合,骨折愈合时间平均为3.8个月.膝关节功能参照Letenneur评估标准,优良6例,可1例.无感染、内固定松动和骨坏死.[结论]切开复位、松质骨拉力螺钉内固定治疗Hoffa骨折是一种安全、有效的治疗方法.正确选择手术人路、满意的复位和骨折端坚强稳定的内固定对疗效具有重要意义.  相似文献   

8.
拉力螺钉辅加抗滑钢板内固定治疗Hoffa骨折   总被引:1,自引:0,他引:1  
目的 探讨拉力螺钉辅加抗滑钢板内固定治疗Hoffa骨折的疗效. 方法 回顾性分析2007年12月至2011年11月手术治疗的12例(14髁)Hoffa骨折患者资料,男8例(10髁),女4例(4髁);年龄20~ 61岁,平均36.2岁.Hoffa骨折类型:内髁骨折6例,外髁骨折4例,双髁骨折2例.骨折按AO/OTA分型:33B32型10例,33B33型2例;按Letenneur分型:Ⅰ型7髁,Ⅱ型1髁,Ⅲ型6髁.开放性骨折2例,闭合性骨折10例.合并伤:股骨干骨折1例,胫骨近端骨折3例,踝部骨折1例,伸膝装置损伤2例,交叉韧带损伤4例,内侧副韧带损伤1例,半月板损伤3例.受伤至手术时间平均为3.2d(2 h至7d).所有患者均采用松质骨拉力螺钉结合抗滑钢板同定治疗. 结果 12例患者术后获6 ~ 54个月(平均20.3个月)随访.骨折均获骨性愈合,愈合时间为11 ~23周,平均16.6周.无内固定失效、骨折移位及骨坏死发生.1例患者出现伤口感染,1例患者出现伤口不愈合,经治疗后痊愈.根据Letenneur功能评估标准评定疗效:优良11例,可1例,优良率为91.7%. 结论 拉力螺钉辅加抗滑钢板治疗Hoffa骨折疗效优良、可靠.选择正确的手术入路、解剖复位及坚强固定是治疗成功的关键.  相似文献   

9.
目的 探讨空心拉力螺钉结合钢板内固定治疗LetenneurⅠ、Ⅲ型Hoffa骨折的方法及临床疗效。方法 自2009-03—2012-08共诊治9例(10髁)Hoffa骨折,其中内侧3髁,外侧7髁,按Letenneur分型:Ⅰ型6髁,Ⅲ型4髁。其中7髁(Ⅰ型骨折6例,Ⅲ型骨折1例)行空心钉结合后方防滑钢板或侧方支撑钢板内固定,3髁(Ⅲ型骨折)行空心钉结合侧方支撑钢板内固定。术后按照Letenneur功能恢复评估系统评定疗效。结果 所有患者均获得随访6~47个月,平均16.7个月。骨折均骨性愈合,愈合时间12~30周,平均18.3周。无内固定松动断裂、感染及股骨髁坏死等并发症发生。术后疗效:优良9髁,差1髁。结论 Hoffa骨折行切开解剖复位空心拉力螺钉结合后方防滑钢板或侧方支撑钢板内固定术,可达到固定坚强可靠、术后能早期功能锻炼、术后功能恢复良好、术后并发症少的治疗效果。  相似文献   

10.
徐毅  李恒  杨红航 《中国骨伤》2016,29(12):1146-1149
目的 :探讨髁间窝螺钉联合钢板固定治疗LetenneurⅢ型Hoffa骨折的临床疗效。方法:自2005年3月至2014年12月采用髁间窝螺钉联合钢板固定治疗Hoffa骨折7例,男5例,女2例;年龄27~68岁,平均42.6岁。外侧髁5例,内侧髁2例。均为闭合骨折。按照Letenneur骨折分型,均为Ⅲ型骨折。观察其骨折愈合及术后并发症情况,并采用Letenneur标准对其疗效进行评价。结果:7例患者获得随访,时间13~26个月,平均17.8个月。所有骨折获得骨性愈合,愈合时间9~15周,平均12.4周。术后无感染、骨折不愈合及骨坏死发生。膝关节功能参照Letenneur评估标准,优6例,可1例。结论:髁间窝螺钉联合钢板固定治疗LetenneurⅢ型Hoffa骨折是一种安全、有效的治疗方法,可以增加骨折固定稳定性,促进骨折愈合,有利于早期功能锻炼,改善膝关节功能。  相似文献   

11.
Hoffa骨折的治疗   总被引:2,自引:1,他引:1  
目的 总结Hoffa骨折的临床特点,探讨其治疗方法及临床疗效.方法对2002年1月至2009年4月收治的20例24髁Hoffa骨折患者资料进行回顾性分析,男14例18髁,女6例6髁;年龄20~70岁,平均43.3岁.股骨内髁骨折15髁,外髁骨折9髁;其中单侧双髁骨折2例,单侧双髁并对侧单髁骨折1例;新鲜骨折20髁,陈旧性骨折内固定失效4髁.骨折按Letenneur分型:Ⅰ型6髁,Ⅱ型4髁,Ⅲ型14髁.15髁使用从前向后方向2~4枚直径3.5或6.5 mm松质骨螺钉或空心螺钉固定,8髁使用从后向前方向螺钉固定,1髁开放性骨折采用2枚3.0 mm克氏针固定.5髁联合使用侧方支持钢板结合螺钉固定,3髁联合使用后方抗滑移钢板结合螺钉固定.结果 20例患者术后获平均14.4个月(6~84个月)随访.所有患者骨折均获骨性愈介,愈合时间为12~44 周,平均18.6周,无骨折不愈合、感染、内固定松动及股骨髁缺血性坏死等并发症发生.参照Letenneur等的Hoffa骨折术后功能评估标准评定疗效:优16髁,良6髁,差2髁,优良率为91.7%.结论 Hoffa骨折临床少见,螺钉固定是Hoffa骨折于术固定方法的金标准,螺钉固定方向、直径及手术切口的选择应视骨折类型和骨折块大小而定.对于不稳定Hoffa骨折,在螺钉固定的基础上应考虑联合应用侧方支持钢板或后方抗滑移钢板固定.
Abstract:
Objective To investigate clinical characteristics and treatment of Hoffa fractures.Methods Twenty patients with Hoffa fracture (24 condyles) were treated from January 2002 to April 2009.They were 14 men (18 condyles) and 6 women (6 condyles), aged from 20 to 70 years (average, 43. 3 years).There were 15 fractures of medial femoral condyle and 9 ones of lateral femoral condyle. Two rare cases were fractures of unilateral bi-condyles and one rare case fractures of unilateral bi-condyles plus contralateral single condyle. Four fractured condyles were old due to implant failure and 20 were fresh. According to the modified Letenneur's classification, there were 6 condyles of type Ⅰ, 4 condyles of type Ⅱ and 14 condyles of type Ⅲ.Fifteen condyles were fixed anteroposteriorly with 2 to 4 cancellous or canulated screws, 8 condyles were fixed posteroanteriorly with 2 to 4 screws, and one condyle was fixed with K wires. Five condyles were fixed with screws plus lateral supporting plates, and 3 condyles with screws plus posterior anti-sliding plates. Results All the patients were followed up for an average of 14. 4 months (6 to 84 months) . All the 24 condyles obtained bony union after an average of 18. 6 weeks (from 12 to 44 weeks). There was no infection, implant failure, nonunion or bone necrosis. According to Letenneur's functional assessment system, 16 condyles were excellent, 6 good and 2 poor, with a good-to-excellent rate of 91. 7%. Conclusions All Hoffa fractures should be treated with screws. Screw diameter, fixation direction and surgical incision should depend on facture type and size of fracture block. Unstable Hoffa fractures should be treated with screws combined with lateral supporting plates or posterior anti-sliding plates.  相似文献   

12.
背景:髋臼横形骨折治疗较为困难,常采用内固定的治疗方法。近年来有学者尝试采用锁定重建接骨板,但对其的研究报道较少。 目的:比较4种不同锁定重建接骨板后方入路内固定方式治疗髋臼横行骨折的生物力学稳定性。 方法:采用成人防腐标本10具,制成髋臼横行骨折模型20个,随机分为4组,每组5个标本。A组:重建接骨板两端各固定3枚螺钉。B组:重建接骨板两端各固定3枚螺钉及距骨折线最近的两侧螺孔各1枚螺钉。C组:锁定重建接骨板两端各3枚单皮质螺钉。D组:锁定重建接骨板两端各3枚单皮质螺钉及距骨折线最近的两侧螺孔各1枚单皮质螺钉。行轴向的加载实验,记录内固定失效时最大负载和轴向刚度。 结果:A、B、C、D组所能承受的最大负载分别为(180.60±11.781)N、(240.80±7.981)N、(243.80±11.755)N和(438.00±23.227)N;轴向刚度分别为(95.21±6.32)N/mm、(123.47±23.95)N/mm、(126.39±18.52)N/mm和(227.35±13.74)N/mm。除B、C两组数据比较无统计学差异(P〉0.05),其余各组的最大负载和轴向刚度差异均有统计学意义(〈0.05)。 结论:髋臼横形骨折采用接骨板后方入路内固定时,锁定重建接骨板固定的稳定性优于重建接骨板,而且距骨折线最近的两侧螺孔给予螺钉固定能增强内固定的稳定性。  相似文献   

13.
股骨远端骨折常见内固定临床应用评价   总被引:25,自引:1,他引:24  
目的: 评价股骨远端骨折常见内固定临床应用效果。方法: 1998~2003年共收治股骨远端骨折 215例,骨折按AO/ASIF标准分型, A型 112例, B型 20例, C型 83例。分别采用AO角钢板、松质骨拉力螺钉、DCS、GSH及AO股骨髁钢板内固定, 合并股骨内侧骨质压缩粉碎较重者, Ⅰ期大块自体髂骨植骨。结果: 经平均 10 6个月随访, AO角钢板固定组 (12例): 2例内固定折断骨不连, 1例骨畸形愈合; 松质骨拉力螺钉固定组 (20例 ): 骨折全部愈合; DCS固定组 (96例): 2例骨不连, 1例内固定折断; GSH固定组 (20例 ): 1例骨不连、锁钉折断; AO股骨髁钢板固定组 (67例): 2例骨不连。膝关节功能按Merchan评分标准评分, 总优良率 93%。结论: 股骨远端骨折的常见内固定器械, 均不具包容性, 术前应正确判定骨折的类型并选用合适的内固定, 合并股骨内侧骨质压缩粉碎较重者, Ⅰ期大块自体髂骨植骨。这样, 才能有效提高此类骨折的优良率。  相似文献   

14.
PURPOSE: To compare the relative strength and stability of 2 fixation methods for displaced coronal shear fractures of the lateral femoral condyle (Hoffa fractures, OTA Type 33B3). SETTING: University Biomechanics laboratory. DESIGN: Eight matched pairs of embalmed femurs were divided into 2 groups and simulated Hoffa fractures were created. In each pair, 1 of the fractures was fixed with 2 screws placed in an anteroposterior direction, and in the other, the fracture was fixed with 2 screws placed in a posteroanterior direction. METHODS: All specimens were cyclically tested with simulated physiologic loading. Displacement of the femoral condyle was continuously measured to 10 cycles. The specimens were then loaded to failure. RESULTS: Fixation with posterior to anteriorly placed cancellous lag screws was significantly more stable than that with anterior to posteriorly placed screws at 10 cycles (P = 0.05), with 0.67 mm displacement compared to 1.36 mm, respectively. They were also more stable at 10, 100, and 1000 cycles; however, these displacements were not statistically significant. Fixation with posteriorly placed cancellous screws also had significantly higher ultimate strength (P = 0.04), 1700 N compared to 1025 N for anterior placement. CONCLUSION AND SIGNIFICANCE: Lag screws placed posterior to anterior provided more stable fixation of Hoffa fractures in embalmed femurs than anteroposteriorly placed lag screws. This finding may apply in the clinical setting; however, this technique requires that the screw heads be recessed beneath the articular surface. The effects of the cartilage defects so created are not known. The choice of technique is also determined by concomitant fractures and the exposure required for their fixation.  相似文献   

15.
Thirteen patients with ipsilateral hip and femoral shaft fractures are discussed. In nine patients, the femoral shaft fracture was managed by a combination of dynamic compression plating with a medial cancellous bone graft and either multiple cancellous screws or a dynamic hip screw for the proximal fracture (Group I). Four patients had Ender pin fixation (Group II). In Group I, both fractures were united within 16 weeks in all patients, and at least 90% of normal hip and knee motion was regained. Nonunions developed in two of the four Group II patients. Immediate separate fixation of ipsilateral hip and femoral shaft fractures allows definitive management of the proximal fracture and immediate mobilization without external support and provides satisfactory results with a low complication rate.  相似文献   

16.
PURPOSE: Most metacarpal fractures are stable and can be treated with nonsurgical stabilization. However, some metacarpal fractures are treated with open reduction and internal fixation because of an open fracture, instability, or multiple fractures. Newer plate designs have emerged that allow a shorter plate and screw construct. We sought to determine the relative strength of 3 different methods of metacarpal plating for unstable fractures. METHODS: We tested our hypothesis in a transverse metacarpal fracture model using fourth-generation, biomechanical testing grade composite sawbones (Sawbones; Pacific Research Laboratories, Vashon, WA). The metacarpals were divided into 3 groups of 15 bones. Group 1 was plated with a standard 6-hole, 2.3-mm plate with 6 nonlocking bicortical screws in standard AO fashion. Group 2 was plated with a 6-hole, double-row, 3-dimensional (3D) plate with 3 nonlocking screws on either side of the fracture aiming for convergence of the screws. Group 3 was plated with a 2.4-mm plate using 6 nonlocking screws and standard AO technique. The metacarpals were then tested to failure in cantilever bending mode. RESULTS: All constructs broke through the bone. No plate failure or screw pullout was seen. Group 1 had a load to failure of 264 N +/- 14. Group 2 had a load to failure of 302 N +/- 17. Group 3 had a load to failure of 274 N +/- 20. The load to failure was highest in group 2 (3D plate). All differences were statistically significant. CONCLUSIONS: All 3 methods produced a strong construct. The load to failure was highest in group 2 (3D plate). Double-row plates with converging screws provide adequate or superior strength of fixation when compared with standard plate constructs.  相似文献   

17.
目的评价后凸成形骨水泥(Polymethylmethacrylate,PMMA)强化技术对骨质疏松情况下骶骨钉固定强度的生物力学影响,为骶骨钉松动选择坚强的补救技术提供依据。方法11具新鲜骶骨标本用于实验,并采用DEXA评价标本骨密度。在同一骶骨标本上,依次建立非PMMA强化和PMMA强化骶骨钉的固定模型如下,A组:单皮质椎弓根钉;B组:双皮质椎弓根钉;C组:传统PMMA强化单皮质椎弓根钉;D组:后凸成形PMMA强化椎弓根钉;E组:后凸成形PMMA强化侧翼钉。在MTS试验机上对五种骶骨钉依次进行轴向拔出测试,记录最大拔出力并比较。结果11具标本的平均骨密度为0.71±0.08g/cm2。A组的螺钉拔出力(508N)显著低于其他4种固定组(P0.05)。B组的螺钉拔出力(685N)与E组(702N)无显著差异(P0.05),但是,两者的拔出力均显著低于C和D组(P0.05)。重要的是,D组(986N)的拔出力显著高于C组(846N)。结论在骨质疏松患者的骶骨固定中,双皮质骶骨椎弓根钉较单皮质具有显著的力学优势。骶骨椎弓根钉一旦发生松动,传统的和后凸成形PMMA强化技术均可成为补救手段,并且后凸成形PMMA强化骶骨椎弓根钉可获得最坚强的锚定。  相似文献   

18.
目的 探讨一期后路经关节螺钉联合前路钢板固定技术治疗下颈椎骨折脱位的效果. 方法 自2005年10月至2007年5月对12例下颈椎骨折脱位患者采用一期前后路联合手术.单纯脱位者,先行后路复位经关节突螺钉固定,再改行前路椎间隙减压,植骨融合,钢板内固定;椎体骨折伴脱位者,前路先行椎体次全切除,植骨融合,钢板内固定,然后行后路经关节螺钉固定脱位节段,小关节间行植骨融合.术前ASIA分级:A级21例,B级6例,C级3例,D级1例. 结果 12例患者获6~21个月(平均14.8个月)随访,椎间及小关节间植骨全部愈合.无螺钉松动及神经、血管并发症.术后除1例完全性瘫痪患者神经功能无恢复外,其余11例均有一级以上恢复.术后ASIA分级:A级1例,B级1例,C级4例,D级4例,E级2例. 结论 下颈椎经关节螺钉联合前路钢板固定融合术,具有操作简单安全、固定可靠、植骨融合率高等优点,是治疗下颈椎骨折脱位较为理想的术式.  相似文献   

19.
Displaced medial malleolus fractures are considered unstable and typically require open reduction and internal fixation for anatomic reduction and early joint range of motion. These fractures are usually fixated with either compression lag screws or tension band wiring depending on the fracture pattern, size of the distal fragment, and bone quality. When fracture fixation fails, it is typically in pullout strength. Failure of primary bone healing can result in nonunion, malunion, and need for revision surgery. The current study wished to explore a potentially stronger fixation technique in regard to pullout strength for medial malleolar fractures compared with traditional cancellous screws. This was a comparative study of the relative pullout strength of 2 fully threaded 3.5-mm bicortical screws versus 2 partially threaded 4.0-mm cancellous screws for the fixation of medial malleolar fractures. Ten fresh-frozen limbs from 5 cadavers, mean age 79 years (range of 65–97 years), were tested using the Instron 8500 Plus system. The median force recorded at 2 mm of distraction using unicortical partially threaded cancellous screws was 116.2 N (range 70.2 to 355.5N) compared with 327.6 N (range 117.5 to 804.3 N) in the fully threaded bicortical screw (P = .04). The unicortical screw fixation displayed only 64.53% of the median strength noted with the bicortical screw fixation at clinical failure. The current study demonstrated statistically significantly greater pullout strength for 3.5-mm bicortical screws when compared with 4.0-mm partially threaded cancellous screws used to fixate medial malleolar fractures in a cadaveric model.  相似文献   

20.
The authors evaluated whether AO/ASIF screws coated with hydroxyapatite are better fixed than standard screws in a highly loaded plate fixation animal study. Twelve sheep were divided into two groups. The medial tibial middiaphysis was exposed and a 5-mm long bone cylinder was removed. The tibiae were fixed with six-hole dynamic compression plates. Six sheep received standard AO/ASIF stainless steel cortical screws (Group A), and six sheep received AO/ASIF stainless steel cortical screws coated with hydroxyapatite (Group B). Three months after surgery, the sheep were euthanized. The mean screw insertion torque was 4800 +/- 768 N/mm in Group A and 4847 +/- 450 N/mm in Group B. The mean screw extraction torque was 530 +/- 374 N/mm in Group A and 3733 +/- 849 N/mm in Group B. Extraction torque of Group A was significantly lower compared with the corresponding insertion torque. In Group B, there were no differences between extraction and insertion torque. Morphologic analyses showed marked fibrous tissue encapsulation in Group A and bone to screw direct contact in Group B. The results confirm that hydroxyapatite-coated AO/ASIF screws prevent deterioration of screw anchorage, even under highly loaded conditions. By using hydroxyapatite-coated screws, complications resulting from inadequate fixation could be avoided.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号