采用陶瓷-陶瓷(Delta陶瓷)与陶瓷-高交联聚乙烯界面在全髋关节置换中的短期对比研究

目的通过临床和影像学随访,观察比较陶瓷-陶瓷(Delta陶瓷界面)与陶瓷-高交联聚乙烯界面在治疗髋关节疾病的短期临床疗效。方法回顾分析自2015年7月至2016年7月共65例(73髋)运用陶瓷对陶瓷(Delta陶瓷界面)和陶瓷对高交联聚乙烯生物型假体行初次全髋关节置换术患者的临床资料,根据关节摩擦界面配伍类型分为两组,即陶瓷对陶瓷组(CC组)和陶瓷对聚乙烯组(CP组)。对有效随访的患者通过X线片测量摩擦界面线性磨损率、髋臼外展角及其改变量,观察假体周围骨溶解及假体松动情况,应用Harris评分标准进行功能评价。结果共61例(69髋)患者获有效随访,平均随访时间26个月(24～30个月)。两组患者性别、年龄、体重、病因及术前Harris评分比较,差异均无统计学意义(P0.05)。CC组假体的磨损因髋臼假体的遮挡而无法测出。CP组术后前两个月的位移值为(0.08±0.011)mm,从术后2～24个月的位移值为(0.017±0.012)mm。CC组Harris评分由术前平均(46.18±7.31)分提高到末次随访时(89.70±6.44)分(P0.001);CP组Harris评分由术前平均(43.92±8.94)分提高到末次随访时(92.61±6.23)分(P0.001)。两组间末次随访时Harris评分差异无统计学意义(P0.05)。所有患者假体与骨之间界面X线片没有透亮带出现,均未出现假体松动。结论陶瓷-陶瓷(Delta陶瓷界面)与陶瓷-高交联聚乙烯界面在治疗髋关节疾病中均有较好的疗效,两种假体的临床疗效在关节置换术后早期并无明显差异。     

陶瓷对陶瓷与金属对聚乙烯全髋关节置换后的早期效果比较的病例对照研究

目的:回顾性研究陶瓷对陶瓷全髋关节假体行人工全髋关节置换术治疗成人髋关节疾病的早期疗效。方法:2007年10月至2010年9月对符合标准的42例患者(44髋)进行了全髋关节置换术。假体类型为DePuy公司Pinnacle陶瓷对陶瓷全髋关节假体(CoC组)和Duraloc金属对聚乙烯全髋关节假体(MoP组),均为非骨水泥型人工关节。其中CoC组20例22髋,男12例,女8例,年龄21～49岁;MoP组22例22髋,男13例,女9例,年龄42～55岁。手术方法采用后外侧入路,术后给予常规抗凝治疗及相应功能锻炼。术后患者进行定期临床与放射学随访,随访时间至少6个月。测量手术前及术后6个月时两组患者关节活动度,并按Harris评分对髋关节功能进行评价。结果:所有患者无脱位、松动、感染及下肢深静脉血栓等并发症发生。两组Harris评分及髋关节活动度术前术后比较差异无统计学意义(P>0.05)。结论:陶瓷对陶瓷全髋在改善患者症状及髋关节活动度方面与传统的金属对聚乙烯关节疗效相当,其优点和长期疗效还有待进一步观察。因其具有良好的耐磨性,是年轻患者全髋关节置换较为理想的关节界面选择。     

H/G非骨水泥人工全髋关节置换术后聚乙烯内杯磨损临床研究

目的 对H/G非骨水泥人工全髋关节置换术后聚乙烯内杯的磨损及髋臼周围骨溶解的情况进行总结.方法 我院1991至1995年共进行58例(65髋)H/G非骨水泥人工全髋关节置换,其中35例(40髋)获得10年以上随访.对这35例(40髋)患者获得随访的病例,采用计算机数字化方法测量髋臼聚乙烯内杯的二维线性磨损.结果 35例40髋均有不同程度的磨损,磨损范围2～8 mm,平均磨损为(0.32±0.31)mm/年.10髋聚乙烯磨损超过6 mm,髋臼假体周围的骨溶解严重,并伴有金属假体的移位,其中5髋聚乙烯内杯完伞磨透,金属股骨头与金属髋臼相接触;5髋聚乙烯内杯磨损严重伴明显骨溶解,内杯松动.2髋聚乙烯内杯脱位.共实施翻修手术12例,包括更换聚乙烯内杯和金属股骨头2例、金属闩杯翻修2例、全髋翻修8例.28髋在髋臼侧发现骨溶解,其中14髋股骨侧亦有骨溶解发生.结论 本组病例所观测到的H/G髋臼聚乙烯内杯的磨损程度超过文献所报道,而且由于磨损产生的大量磨屑,导致假体周围出现明显骨溶解,直接影响到假体的稳定.关节置换术后应定期随访,避免出现严重骨溶解后增加翻修手术的困难.     

金属对聚乙烯假体全髋关节置换术后磨损的中期随访研究

【摘要】〓目的〓对金属-聚乙烯(MOP)全髋关节置换术(THA)后患者的界面磨损进行回顾性研究,探讨不同年龄段患者金属-聚乙烯全髋关节置换术的临床疗效。 方法〓收集2003年5月到2008年11月期间于常熟市第一人民医院行THA患者资料研究,共获得完整病例资料84例(88髋),按年龄及活动量分为两组:年龄<50岁和活动量大病例组(A组)和年龄≥50岁和活动量小病例组(B组)。全髋假体为钻铬钼合金-高分子聚乙烯全髋假体,临床疗效应用Harris评分标准进行临床随访和对比研究,影像学进行内衬磨损率及骨溶解测量分析。 结果〓所有病例均取的至少5年的完整随访资料,其中A组有3例3髋(7.7%)因假体松动而最终行翻修手术,而B组资料中无任何翻修病例。所有病例均未发生骨折、感染、深静脉血栓(DVT)等常见并发症。A组Harris评分由术前34.13±6.28改善至手术后91.35±2.68,B组35.51±5.32改善至90.05±2.47;影像学观察,A组内衬磨损率为每年0.19±0.24 mm,B组为每年0.09±0.13 mm,两组中MOP内衬磨损差异具有统计学意义(P<0.05);A组MOP全部发生不同程度的骨溶解,B组MOP骨溶解的发生率为63.16%,两组比较,P<0.05)。结论〓对于小于50岁和活动量大的患者,MOP假体的内衬磨损、骨溶解及影像学松动率均明显高于年龄≥50岁和活动量小的病例组,因此,对于年轻患者使用MOP假体应慎重,而对于老年病人和低活动需求的病人行THA时中期疗效较好。     

陶瓷球头和金属球头配伍聚乙烯臼杯的20年长期对比磨损研究

背景关节承载面是假体磨损过程中的重要假体相关因素。目前已知聚乙烯磨损是全髋关节置换术后髋臼和股骨假体组件无菌性松动的主要原因。方法本项前瞻性研究中,共随机挑选了80例同时期患者共93个髋关节接受了非骨水泥髋关节置换术,使用钛涂层的RM臼杯和CLS股骨柄。80例髋关节使用陶瓷球头,13例使用钴铬钼合金球头,所有股骨头直径均为32 mm。所有患者平均年龄为52岁,研究平均随访时间为19.3年。所有患者均获得随访。结果随访时使用EBRA系统对髋臼假体组件的磨损、倾斜和前倾角进行影像学评估。其中55例髋关节进行了磨损率的确认。翻修病例的平均磨损率为0.191 mm年/,而未翻修病例的平均磨损率为0.105 mm年/(P=0.041)。钴铬钼合金组平均磨损率为0.190 mm年/,陶瓷组平均磨损率为0.107 mm年/(P=0.025)。钴铬钼合金组的翻修率(13例中6例)明显高于陶瓷组(80例中11例)。股骨球头磨损率与其材料(P=0.025)、股骨柄周围骨溶解(P=0.003)、臼杯骨溶解(P=0.011)、臼杯翻修(P=0.041)以及臼杯倾斜(P=0.012)呈正性相关。结论本长期研究表明,在20年的时间里,陶瓷股骨头与钴铬钼合金股骨头相比造成的线性磨损更少,从而显著减少骨溶解的发生以及任一假体部件的翻修。     

中青年患者采用陶对陶与金属对聚乙烯全髋置换术的中远期疗效比较研究

目的分析比较陶瓷对陶瓷(CoC)与金属对聚乙烯(MoP)在中青年患者行初次全髋关节置换术(THA)的中远期疗效。方法回顾性分析自2000-03—2009-05采用第3代CoC行THA 68例(CoC组)和采用MoP行THA 43例(MoP组)的临床资料。采用Harris评分及UCLA评分评估患者髋关节功能和活动水平,采用Kaplan-Meier生存分析评估假体生存情况,采用影像学征象评估骨溶解、假体松动等并发症,并记录陶瓷假体碎裂、吱吱音等陶瓷假体特异性并发症。结果CoC组获得平均9.7(5~13)年随访,MoP组获平均10.5(5~15)年随访。MoP组均发生不同程度骨溶解,CoC组未见骨溶解;MoP组11例髋臼侧松动,5例股骨柄假体松动,下沉2 mm,而CoC组未见假体松动;MoP组聚乙烯平均线性磨损是0.25 mm/年,CoC组陶瓷内衬几乎无磨损,无法精准测得。MoP组以翻修手术作为终点的假体5年及10年的生存率分别为95.7%和80.4%,而CoC组为98.6%和97.3%,其中,MoP组的翻修都与假体松动有关,而CoC组是因3例三明治陶瓷内衬碎裂引起。结论第3代CoC与MoP假体比较,更能满足活动量大、使用寿命长的中青年患者行THA的需要,中远期疗效满意。     

Metasul非骨水泥金属对金属全髋关节置换术在50岁以下患者的应用

背景：全髋关节置换术后的长期使用结果很难在年轻患者中获得。我们对一组活动量大、要求较高、年龄小于50岁的患者使用Metasul金属对金属关节行非骨水泥型全髋关节置换术，并对这组患者的临床和影像学的中期结果进行回顾研究。方法：对62例年龄小于50岁(平均年龄37岁)的患者行70个全髋关节置换术。2例患者(2个髋)因在全髋关节置换术后5年内出现深部感染而行关节切除成形术，予以剔除。余60例患者(68个髋)获得完整的临床和影像学随访，平均随访时间为7年。结果：患髋Harris评分从术前平均49分，提高至末次随访时的95分；56例患者(93％)疗效评价为优。末次随访时影像学检查未发现假体松动表现。1例患者发现一处骨盆局灶性骨溶解，另1例患者有两处小的股骨局灶性骨溶解。出现骨盆局灶性骨溶解的髋关节接受了翻修手术，更换髋臼内衬，对未松动假体周围的骨溶解灶进行植骨。结论：通过对本组患者术后平均7年的随访，可见Metasul金属对金属全髋关节置换术的骨溶解和无菌性松动发生率较低。但有必要进一步随访，以明确与金属对金属关节置换有关的任何长期不良事件。可信水平：治疗性研究，Ⅳ级[病例系列(没有，或历史，对照组)]。进一步可信度参见作者介绍。     

陶瓷对陶瓷全髋关节置换术的初步体会

目的回顾分析本组陶瓷对陶瓷全髋关节置换术的临床结果,探讨行全陶人工髋关节置换的手术体会。方法本组在2000年3月~2008年4月间,对行陶瓷对陶瓷全髋关节置换术的患者进行随访,随访时间超过24个月的有202例(269髋),其中男123例(178髋),女79例(91髋),平均年龄46岁,随访时间平均41(24~122)个月。所有这些患者均进行了临床和影像学评估。结果本组患者术前Harris评分平均53.47(3~85)分,术后平均为90.66(59~100)分。术后随访无患者有关节异响的主诉,未见假体松动,未发生假体周围感染,无翻修患者。无可观察到的磨损和骨溶解,无明显异位骨化。本组患者术中出现1例边缘崩裂。四种不同公司的髋臼对患术后Harris评分无显著影响。结论本研究的短期随访结果显示,现代陶瓷对陶瓷全髋关节置换术对于年轻的骨质量较好的患者是一种良好的选择,但需更长期的随访以验证其长期疗效。     

陶瓷对陶瓷与金属对聚乙烯全髋关节置换的10年随访研究

目的 比较陶瓷对陶瓷（ceramic-on-ceramic, COC）与金属对聚乙烯（metal-on-polyethylene, MOP）全髋关节置换的10年随访临床结果。 方法 对114例接受初次THA的患者进行回顾性研究,其中COC组48例（54髋）,MOP组66例（67髋）,比较COC与MOP两种不同摩擦界面假体的术后髋关节功能、翻修率以及不良事件发生率。 结果 末次随访时患者COC组与MOP组术后髋关节Harris评分分别为89.9±7.5和92.3±8.2,无显著性差异（P＞0.05）;COC组1例翻修（翻修时间术后3年）,MOP组4例翻修（翻修时间平均6年）。两者在翻修、脱位、假体破碎、关节异响、无菌性松动、假体周围骨溶解、深部感染、异化骨化发生率的比较,无显著性差异（P＞0.05）。结论 COC与MOP假体均能提供较好的临床疗效,两者在术后髋关节功能及并发症方面疗效相当。     

陶瓷对陶瓷界面全髋关节置换术后疗效与血清金属离子浓度分析

目的 分析陶瓷对陶瓷全髋关节置换术后临床疗效与血清金属离子浓度变化情况.方法 纳入自2016-01-2018-01采用陶瓷对陶瓷全髋关节置换术治疗的60例(60髋)股骨头缺血性坏死,术后1年进行髋关节Harris评分,并测定患者血清中铝离子及锆离子浓度.结果 60例均获得1年随访,术后1年髋关节功能Harris评分为(...     

全髋关节置换术后聚乙烯内衬磨损的测量及其临床意义

目的以计算机数字化方法计测人工全髋假体二维线性磨损,并探讨磨损程度与长期随访结果的临床相关性。方法利用计算机软件测量股骨头中心相对于髋臼中心的矢量位移,来决定关节面磨损的大小和方向。对 104髋非骨水泥型人工假体进行磨损计测、临床和放射学检查,平均随访时间为 8.4年。结果 14髋股骨或髋臼假体松动,假体松动率为 13.5％。平均线性磨损值为 1.14 mm,磨损率为 0.15 mm/年。聚乙烯磨损与髋臼侧骨溶解及假体松动相关 (P< 0.05)。多因素回归分析未发现磨损和患者年龄、体重、髋杯大小和外展角、活动量水平以及 Harris髋关节评分的相关关系。结论此方法可应用于各种不同设计的人工假体内衬的二维磨损测量。磨损与骨溶解显著相关,并与假体松动互为因果。因此,在进行临床随访、放射学观察的同时,磨损情况也是全面评价全髋置换术临床结果的一个重要指标。     

病灶清除植骨保留髋臼假体的翻修术治疗假体周围局灶性骨溶解

目的 探讨病灶清除植骨保留髋臼假体的翻修术治疗全髋关节置换(total hip arthroplasty,THA)术后稳定固定的髋臼假体周围局灶性骨溶解的疗效.方法 2006年3月至2009年3月,THA术后髋臼假体稳定固定的假体周围局灶性骨溶解患者23例(23髋),男13例,女10例;年龄39～54岁,平均46.6岁.23例均为非骨水泥髋臼.初次THA至诊断髋臼假体周围骨溶解的时间为4.6～7.4年,平均5.5年.术前HarTis髋关节评分74分.手术经腹股沟入路,行髂骨内板开窗,清除髋臼骨溶解病灶、同种异体颗粒骨植骨;经后外侧人路更换聚乙烯内衬、股骨头假体,保留髋臼假体.翻修术后1、3、6、12个月及之后每年随访1次,以髋关节Harris评分评价临床疗效,摄X线片、CT扫描观察植骨区愈合、新发骨溶解病灶及假体移位情况.结果 16例获得随访,随访时间8～38个月,平均28个月.末次随访时Harris髋关节评分86～100分,平均93.8分.16例植骨区成骨均良好,12例植骨区完全被周围骨爬行替代,髋臼假体固定好,无髋臼假体松动及移位,无新发髋臼假体周围骨溶解,无异位骨化、脱位、深静脉血栓形成及感染等并发症.结论 清除病灶植骨、保留髋臼假体、更换聚乙烯内衬和股骨头假体的翻修术可有效减少聚乙烯磨损颗粒产生,避免骨溶解病灶进展导致的假体松动,近期随访结果良好.     

生物型陶瓷人工双极股骨头假体的5年临床和放射学影像随访分析

目的 评估应用生物型陶瓷人工双极股骨头假体置换治疗老年新鲜股骨颈骨折的5年临床和放射学影像随访疗效.方法 回顾性分析2005年4月至2007年4月,87例接受生物型陶瓷人工双极股骨头置换治疗的老年股骨颈骨折患者,男39例,女48例;年龄72～96岁,平均（83.4±4.12）岁.股骨颈骨折的分型按Garden分型：Ⅲ型32例,Ⅳ型55例.术前均经常规双能X线吸收测量法（DXA）检测脊柱及髋部骨密度（BMD）筛选,全部采用Biomet生物型Bi-Metric系列股骨假体和陶瓷双极股骨头假体.患者分别在手术后1.5、3、6、12个月及之后每年随访一次,根据临床髋关节活动度和Harris评价标准,放射学影像根据AAOS评价指标：髋臼磨损情况,陶瓷组件碎裂情况,假体周围骨溶解及溶骨性病变情况,股骨近端骨生长情况,股骨距重塑,股骨假体远端底座形成情况等.结果 实际83例患者完成终末随访,随访时间61～82个月,平均（72.4±6.57）个月.髋关节活动范围在终末随访时为：屈曲平均（83.5 °± 9.14°）,后伸平均（25.2°±5.62°）,外展平均（41.5°±5.21°）.Harris评分从术前平均（11.5±4.0）分,提高到终末随访时平均（89.1±2.1）分,手术前后有统计学差异（t=27.18,P〈0.01）;其中优31例,良40例,可10例,差2例,优良率为85.54%（71/83）.5例（6.02%）患者出现腹股沟区和大腿前侧疼痛,2例（2.41%）患者在手术后3～5年间由于股骨假体出现松动而进行股骨假体翻修.放射影像学随访观察无髋臼严重磨损,无陶瓷组件碎裂,无股骨假体周围骨溶解,无股骨假体松动,股骨近端骨生长情况良好,有24例（28.92%）患者发生股骨假体远端轻度底座形成.结论 应用生物型陶瓷人工双极股骨头假体置换治疗老年新鲜股骨颈骨折获得较好的5年临床和放射学影像随访效果.     

Alternative bearing surfaces in total hip arthroplasty: zirconia-alumina pairing. Contribution or caveat?

The aim of the present study was to evaluate the zirconia and alumina articulation in total hip arthroplasty in regard to clinical and radiological outcome. This is the first report concerning the clinical application of a hybrid ceramic articulation. Owing to ethical reasons, a limited number of patients was enrolled in the study. Ten consecutive patients with degenerative arthritis were randomly allocated after informed consent to hybrid total hip arthroplasty treatment using an alumina femoral head and an alumina acetabular liner (5 hips), or using a zirconia femoral head and an alumina acetabular liner (5 hips). The median age of patients at index operation was 57.8 years. Current criteria were used for clinical and radiological assessment. The mean follow-up was 5.1 years (5 to 5.3 years). No hip required revision, and no clinical and radiological differences were observed between the two groups of hips. The median preoperative Harris hip score was rated 55.3 points in the control group of hips with alumina head, and 55.6 in the group of hips with zirconia head. The median Harris hip score increased to 94.9 points at the time of follow-up in the control group, and 96 points in the zirconia group. No radiological signs of cup loosening or focal acetabular osteolysis were detected at follow-up. All stems showed stable fixation without radiolucent lines or focal osteolysis. Zirconia femoral heads and alumina acetabular liners have been successfully used in the present series of 5 total hip arthroplasties with a mean follow-up of 5.1 years. Nevertheless, the use of femoral heads made of zirconia in total hip arthroplasties remains an important clinical concern due to the potential genesis of wear microparticles which can lead to progressive osteolysis. Further in-vitro and in-vivo investigations are required to define the value of this alternative bearing surface.     

全髋关节置换术治疗成人髋关节发育不良继发骨关节炎五年以上随访研究

目的 评价全髋关节置换术(total hip arthroplasty,THA)在成人髋关节发育不良(develop-mental dysplasia of the hip,DDH)继发骨关节炎患者中的疗效,回顾性分析该类患者THA术后5年以上的临床疗效及其影响因素.方法 对2000年2月至2002年7月在我院采用THA治疗DDH继发骨关节炎的患者55例(69髋)进行术后随访.临床评估以Harris评分为标准.影像学评估根据随访骨盆平片及患髋正、侧位X线片,观察髋臼、股骨假体位置及其周围骨质变化,测量内衬磨损率.假体生存率采用Kaplan-Meier方法进行分析,以任何原因的臼杯、股骨柄翻修或影像学假体明显松动为随访终点.结果 截至随访终点,共45例(57)髋获得5年以上随访,平均随访时间69个月,随访率为81.8%.Harris评分由术前的(46.19±18.01)分提高至末次随访时的(91.78±3.52)分,尚无假体翻修病例.聚乙烯内衬平均磨损率为(0.27±0.14)mm/年.5髋髋臼侧发生骨溶解,8髋股骨侧近端发生骨溶解.Kaplan-Meier分析假体总生存率为1.0(95%可信区间,0.98～1.00).结论 THA治疗DDH继发骨关节炎5年以上随访的影像学表现及临床效果尚可,但存在较高的聚乙烯磨损率及骨溶解发生率,对于年轻、活动量大的DDH患者,THA手术时应选择新型耐摩擦界面假体.DDH患者的定期随访尤为重要,可甲期发现骨溶解,及时给予相应的治疗.     

Comparison of Surgical Outcomes Between Standard and Elevated-Rim Highly Cross-Linked Polyethylene Acetabular Liners in Primary Total Hip Arthroplasty With Minimum 15-Year Follow-Up: Single-Center,Retrospective Cohort Study

BackgroundThe aims of the present study are to (1) conduct the longest-to-date follow-up wear analysis of the highly cross-linked polyethylene acetabular liners, (2) assess the incidence of femoral and acetabular osteolysis, and (3) compare the surgical outcomes between standard and elevated-rim acetabular liners in primary total hip arthroplasty (THA).MethodsIn this retrospective cohort study, we evaluated 112 primary THAs performed by a single experienced arthroplasty surgeon at our institution between March 2000 and December 2003. Patients were classified based on the type of acetabular liner used: standard or elevated-rim liner. For evaluation of surgical outcomes, the following data were collected: acetabular cup position (anteversion and inclination), wear rate (linear and volumetric), presence of osteolysis, history of reoperation (all-cause and wear-related), complications (deep joint infection, dislocation, and periprosthetic fracture), and Harris hip score at last follow-up.ResultsLinear and volumetric wear rates were 0.028 mm/y (0.000-0.145 mm/y) and 11.641 mm³/y (0.000-70.000 mm³/y) in the standard group and 0.026 mm/y (0.000-0.094mm/y) and 9.706 mm³/y (0.000-33.000 mm³/y) in the elevated-rim group, respectively. These rates were not significantly different between groups. One case of osteolysis was confirmed in the standard group, whereas no osteolysis was observed in the elevated-rim group.ConclusionWe suggest that elevated-rim highly cross-linked polyethylene acetabular liners might be a good implant option that can be used safely.     

高交联聚乙烯内衬在中国年轻全髋关节置换患者中应用的6年随访结果

目的回顾性分析50岁或以下的中国年轻全髋关节置换术（THA）患者中应用高交联聚乙烯内衬的临床效果和线性磨损率。方法对本中心应用Marathon高交联聚乙烯内衬和Duraloc非骨水泥臼杯的38髋,29例THA患者的治疗结果进行了回顾性分析。通过Harris髋关节评分对临床效果进行评估。在随访期间,测量每一年的X线片,对比分析臼杯内衬的线性磨损和周围的骨溶解情况。结果患者手术时的平均年龄为（41.0±6.86）岁（29~50岁）。所有股骨假体的球头直径为28 mm。26髋应用了非骨水泥假体柄,12髋应用了骨水泥假体柄。平均随访时间（7.2±1.3）年（6~9.6年）。平均Harris髋关节评分由术前的（45.3±18.0）分（12~73分）显著提高到术后的（93.26±9.9）分（64~100分）。末次随访X线片上未见髋臼周围骨溶解改变。高交联聚乙烯内衬的第一年蠕变量为：（0.26±0.21）mm（0.01~0.91 mm）,聚乙烯内衬在术后2年的平均累积线性磨损量为：（0.31±0.19）mm（0.04~0.76 mm）,术后3年的平均累积线性磨损量为：（0.31±0.21）mm（0.07~0.93 mm）,术后4年的平均累积线性磨损量为：（0.34±0.31）mm（0.07~1.68 mm）,术后5年和6年的平均累积线性磨损量分别为：（0.38±0.22）mm（0.07~0.97 mm）和（0.38±0.25）mm（0.08~1.26 mm）。手术2年后的聚乙烯平均线性磨损率为：0.025 mm年/。结论应用于中国年青患者THA术中的高交联聚乙烯内衬具有低的线性磨损率,从而可以降低磨损和由此而引起的骨溶解的发生。Marathon高交联聚乙烯内衬材料具有满意的临床应用效果。     

Total hip replacement with a cementless acetabular component and a cemented femoral component in patients younger than fifty years of age

BACKGROUND: We have been using hybrid total hip arthroplasty (a cementless acetabular component and a cemented stem) in young patients. The purpose of this study was to determine the prevalence of aseptic loosening, polyethylene wear, and osteolysis after the use of this technique. METHODS: We studied a prospective consecutive series of sixty-four primary hybrid total hip replacements in fifty-five patients younger than fifty years old. There were forty-three men and twelve women; the average age at the time of the index operation was 43.4 years. The average duration of follow-up was 9.4 years. We used a cementless acetabular component without screw-holes and a cemented femoral component with a 22-mm head in all hips. Clinical follow-up with use of Harris hip ratings and radiographic follow-up were performed at six weeks; at three, six, and twelve months; and yearly thereafter. The sequential annual linear and volumetric wear rates were measured, and bone-remodeling and osteolysis were assessed. RESULTS: The mean preoperative Harris hip score was 44 points, which increased to 95 points at the time of final follow-up. No hip had aseptic loosening. One hip (2%) was revised because of late infection. The average linear wear (and standard deviation) was 0.96 +/- 0.066 mm, with an average annual rate of 0.096 +/- 0.013 mm. The average volumetric wear was 364.7 +/- 25.2 mm (3), with an average annual rate of 43.4 +/- 3.5 mm (3). Six hips (9%) had an osteolytic lesion of <1 cm in diameter in the calcar femorale (zone 7). CONCLUSIONS: Our results show that a hybrid arthroplasty with a cementless acetabular component and a smooth cemented femoral component (Ra, 0.6 mm) is effective for primary total hip replacement in young patients. Although there was no aseptic loosening and a low prevalence of osteolysis at the latest follow-up evaluation, the high rates of linear and volumetric wear of the polyethylene liner in these young patients remain a concern.     

Clinical performance of a Durasul highly cross-linked polyethylene acetabular liner for total hip arthroplasty at five years

BACKGROUND: Highly cross-linked polyethylene is currently the most common articulation surface used for total hip arthroplasty. The hypothesis of the present study was that the Durasul highly cross-linked polyethylene acetabular liner would have less wear at five years than would a conventional polyethylene liner used in association with the same total hip replacement system. METHODS: Forty-three consecutive patients (fifty hips) underwent total hip replacement with an uncemented titanium porous-coated metal cup and a Durasul liner that was mated with a 28-mm cobalt-chromium femoral head. Thirty-one patients (thirty-seven hips) were followed for at least five years. Thirty-five other patients (thirty-seven hips) underwent total hip arthroplasty with the same system but with a conventional polyethylene liner, and these patients also were followed for five years. Clinical assessment was performed with use of the Harris hip score and a patient self-assessment examination. Radiographic analysis included measurements of acetabular component position, fixation, and osteolysis. Femoral head penetration of the Durasul liners was compared with that of the conventional liners. RESULTS: The clinical results as determined on the basis of Harris hip scores and patient self-assessment examinations did not differ between the Durasul group and the control group. The mean bedding-in penetration was 0.054 +/- 0.07 mm for the Durasul group and 0.059 +/- 0.154 mm for the control group. The subsequent penetration, with elimination of the bedding-in wear, resulted in a linear wear rate of 0.029 +/- 0.02 mm per year for the Durasul group, compared with 0.065 +/- 0.03 mm per year for the control group (p < 0.005). The annual penetration at one and five years was 0.074 mm and 0.011 mm, respectively, for the Durasul group, compared with 0.151 mm and 0.04 mm, respectively, for the control group. CONCLUSIONS: While the qualitative wear pattern of the highly cross-linked polyethylene liner was the same as that of the conventional polyethylene liner, the annual linear wear rate was 45% of that seen with the conventional polyethylene liner. Therefore, we believe that these early data support the continued use of this highly cross-linked polyethylene liner for total hip arthroplasty.     

Total hip arthroplasty with a cementless acetabular component and a cemented femoral component in the treatment of Chinese patients with femoral head necrosis

The purpose of this study was to evaluate midterm clinical and radiographic outcomes associated with hybrid total hip arthroplasty in a consecutive series of 86 Chinese patients (93 hips) with osteonecrosis of the femoral head, which revealed that the mean Harris hip score increased from 39 +/- 6.0 points before operation to 90.4 +/- 4.6 points at the latest follow-up. There was pelvic osteolysis in one hip (1%), which required revision, and some small focal areas of femoral osteolysis in 12 hips (13%) were observed. The mean linear wear rate was 0.143 +/- 0.05 mm/y (0.02-0.45 mm/y). No loosening of the components was observed radiographically. The survival rate of the acetabular and femoral components for revision was 98% (95% confidence interval, 0.96-1.0) and 100% (95% confidence interval, 0.95-1.0). Hybrid total hip arthroplasty in patients with osteonecrosis of the femoral head had a satisfactory clinical and radiographic outcome at a minimum 5 years of follow-up. Because polyethylene wear and osteolysis cannot be avoided, the long-term effect should be further studied.