生物型翻修加长柄在人工全髋关节翻修术中的应用

目的探讨生物型翻修加长柄治疗全髋关节置换术后股骨假体松动伴股骨骨缺损的早期疗效。方法对15例(15髋)全髋关节置换术后股骨假体松动伴股骨骨缺损采用生物型翻修加长柄治疗,对于骨缺损采用自体或同种异体颗粒骨植骨,自体大块髂骨结构性植骨,使用钢丝、钢缆固定。结果术后髋关节疼痛消失,关节功能改善。15例获随访6~22个月,平均18个月。末次随访时未发现假体周围骨折及假体远端出现新透亮带,Harris评分平均89.8分。结论人工全髋关节翻修术中使用生物型翻修加长柄治疗股骨假体松动伴股骨骨缺损早期疗效可靠,但远期疗效有待进一步观察。     

远端固定型假体结合同种异体骨移植在髋关节股骨翻修中的应用

[目的]探讨应用远端固定生物型假体结合同种异体骨移植进行髋关节股骨侧翻修的临床效果。[方法]2008年7月~2014年5月,行非感染性假体松动股骨侧翻修11例(骨水泥假体10例,非骨水泥假体1例)。所有患者采用远端固定生物型假体结合股骨近端同种异体颗粒骨打压植骨,其中7例同时应用同种异体皮质骨支撑植骨。男4例,女7例;平均年龄65.3岁(48~79岁);左侧7例,右侧4例。初次置换原因:股骨头无菌性坏死6例,股骨颈骨折3例,骨性关节炎2例。翻修距原手术时间平均12.8年(3~21年)。依据Paprosky分型,Ⅱ型4例,ⅢA型4例,ⅢB型3例。临床功能评价采用Harris评分。翻修用假体:Restoration(Stryker)3髋,MP(Link)8髋。[结果]所有患者均获得随访,随防时间12~75个月,平均29个月。1例术后出现切口渗液,15d后愈合;1例术后6年并发假体周围螺旋形骨折(Vancouver分型B1),假体未松动,行切开复位内固定术。随访期内X线片显示移植骨均愈合良好,假体稳固,周围未见透亮带及松动、下沉征象;术前6例双下肢不等长患者均得到矫正(长度差1 cm);无感染、脱位及深静脉血栓形成等并发症;无假体再翻修病例。Harris评分从术前的平均(30.3±7.2)分提高到最后评估时的平均(82.4±5.9)分,Harris评分优良率为81.8%。[结论]在伴有广泛骨质缺失的股骨翻修中,远端固定生物型假体是较好的选择。术中采用股骨近端颗粒骨打压植骨重建干骺端骨缺损,并在股骨干部皮质薄弱或缺损时结合同种异体皮质骨支撑植骨,可使假体柄远近段均获得较好的初始稳定性,且中短期临床效果满意,远期疗效尚有待观察。     

异体皮质骨支撑植骨在髋关节股骨翻修术中的应用

目的探讨异体皮质骨支撑植骨在髋关节股骨翻修术中应用的适应证及临床效果。方法从2001年10月至2007年12月，笔者对41例股骨严重骨缺损的患者在髋关节翻修术中应用了同种异体皮质骨支撑植骨。主要在以下三种情况下使用，一是采用延长股骨粗隆截骨（ETO）取股骨假体，而患者近端骨质疏松或原有严重的骨缺损，采用远端固定假体翻修，为增加股骨近端的强度或增加ETO后股骨近端的稳定性而采用，这类患者共20例；二是在采用打压植骨进行股骨重建时，因为股骨存在有节段性缺损，或因取股骨远端骨水泥而进行股骨开窗造成股骨节段性缺损时，为了封闭骨缺损，使其成为包容性缺损而采用，这类患者共6例；三是在有严重股骨骨质疏松的患者出现股骨骨折时采用，这类患者共15例。笔者进行了平均37个月（6～72个月）的随访。结果所有同种异体皮质骨在术后12个月可以看出有与宿主骨结合的征象，假体固定稳定。未发生感染、排异反应或假体松动征象，髋关节Harris评分从术前平均38分增加到术后的88．1分。结论异体皮质骨支撑植骨在某些股骨翻修情况下有其特殊的需要，能够作为生物接骨板提供机械稳定性和生物稳定性，目前有不可替代的作用。     

髓内打压植骨结合广泛多孔涂层长柄假体在股骨侧严重骨缺损（PaproskymA型）翻修术中的应用

目的 探讨股骨侧严重骨缺损（Paprosky ⅢA型）翻修中应用髓内打压植骨结合广泛多孔涂层长柄假体的临床疗效.方法 2006年3月～2010年9月,对38例（38髋）Paprosky ⅢA型股骨骨缺损患者行翻修重建,其中男24例,女14例,平均年龄62岁.翻修原因：骨溶解、无菌性松动29例,全髋关节置换术（THA）术后感染二期翻修6例,假体周围骨折3例（Vancouver B3型）.股骨侧干骺端骨缺损采用同种异体颗粒骨髓腔内打压植骨进行修复,股骨柄采用全涂层长柄假体（7～10英寸）.术后定期随访,髋关节功能评价采用Harris评分,影像学采用X线片及CT观察：假体柄有无松动下沉、股骨近端应力遮挡情况、植入的异体颗粒骨与宿主骨整合情况.结果 38例均获得随访,平均随访53.4个月（23～62个月）,Harris评分由术前平均42分（32～47分）,提高至末次随访时平均86分（69～95分）.无患者发生脱位、假体周围骨折.1例术后感染,行再次二期翻修;1例假体柄在术后6个月内下沉4.24 cm,再次翻修时选择更粗的假体柄,末次随访时假体柄稳定;其余所有患者假体柄均牢固固定.3例出现轻-中度应力遮挡.15例近端皮质骨密度及厚度有增加,厚度平均增加约1.8 mm（0.7～3.5 mm）,植入骨与宿主骨逐渐整合并增加了骨缺损区的骨质储备.结论严重骨缺损（Paprosky ⅢA型）的股骨翻修中,采用髓内颗粒骨打压植骨可以很好的修复股骨中上段骨缺损,重建股骨干骺端.依靠广泛多孔涂层长柄假体在远端的牢固压配固定,结合股骨干骺端髓内紧密打压植骨,使假体柄在股骨中上段及远端均能获得较好的初始稳定性,近期临床和影像学结果满意,远期疗效有待观察.     

全涂层远端固定长柄假体治疗髋关节置换术后股骨假体周围骨折的临床研究

目的分析全涂层远端固定长柄假体治疗髋关节置换术后假体周围骨折的临床效果。方法回顾性分析35例使用全涂层远端固定长柄假体治疗的髋关节置换术后股骨假体周围骨折病例,根据Vancouver分型,B2型12例,B3型20例,C型3例,通过Harris评分对患髋进行功能评价,X线片观察骨折愈合、股骨柄下沉情况。结果3例行单纯长柄假体翻修,10例行长柄假体翻修＋钢丝环扎固定,22例行长柄假体翻修＋同种异体颗粒骨压配植骨＋同种异体骨板捆绑固定治疗,平均随访4．5年,所有骨折均顺利愈合,平均愈合时间为15．3周,Harris评分平均86．5分,2例股骨柄分别下沉3mm和4mm,均在术后3个月达到稳定,32例假体获得骨长入固定,3例获得稳定的纤维固定,未发现骨溶解、感染以及再发骨折。结论髋关节置换术后假体周围骨折选择全涂层远端固定长柄假体翻修,根据骨缺损严重程度合理选择同种异体颗粒骨打压植骨＋同种异体骨板捆绑固定可以获得良好的临床效果。     

人工全髋关节翻修术中股骨骨缺损的处理和股骨假体的选择

目的探讨人工全髋关节翻修时股骨侧骨缺损的处理和股骨假体的选择。方法2002年1月至2007年6月55例资料较完整的患者中，男16例，女39例；年龄30-89岁，平均73岁。翻修原因：假体松动35例；股骨侧假体下沉4例，断裂1例；髋臼磨透2例；股骨假体周围骨折3例；股骨假体末端穿通皮质3例；头臼不匹配2例；髋臼假体位置不良导致复发性脱位2例，髋臼局限性骨溶解3例；合并股骨骨缺损21例。按AAOS分类标准：Ⅰ型：节段性骨缺损5例；Ⅱ型：腔隙性骨缺损10例；Ⅲ型：混合型骨缺损6例。结果48例患者行全髋关节置换翻修术；7例保留较稳固的原股骨假体。5例股骨节段性骨缺损中，2例予自体大块髂骨移植＋选用远端稳定的加长生物型假体，1例予异体骨块和自体髂骨移植＋选用远端稳定的加长生物型假体，2例予自体大块髂骨移植＋选用加长骨水泥型假体；10例股骨腔隙性骨缺损中，2例应用骨水泥型假体，8例选用远端稳定加长生物型假体后，骨缺损部位予自体和异体骨混合植骨。6例混合型骨缺损，2例应用骨水泥型假体，4例选用远端稳定的加长生物型假体，骨缺损部位予自体和异体骨混合植骨。随访时间6-62个月，平均38个月。Harris评分由术前的平均49分，提高至随访时平均88分。结论股骨侧翻修的难点在于骨水泥假体的取出和骨缺损的修复，可采用截骨方法取出骨水泥假体；选用远端稳定的加长生物型股骨假体适用于多数的股骨翻修。     

髋臼加强环联合同种异体骨植骨髋关节翻修的中期临床疗效观察

[目的]观察分析髋臼加强环联合同种异体骨植骨在严重髋臼骨缺损人工髋关节翻修术中的应用及临床疗效,探讨其在髋臼骨缺损重建中的作用。[方法]2010年3月~2015年2月,采用髋臼加强环联合同种异体骨植骨行髋关节翻修75例(87髋),67例患者79髋获得随访(失随访8例)。男39例,女28例;年龄45~72岁,平均59.2岁。初次置换至此次翻修时间为2~15年,平均10.3年。翻修原因:假体松动和骨溶解。术前髋关节功能Harris评分为(32.5±3.3)分。髋臼骨缺损按照美国骨科医师协会(AAOS)分型标准:Ⅲ型51髋,Ⅳ型28髋。[结果]67例患者79髋获得随访(失随访8例),随访时间3~60个月,平均32个月。术后切口Ⅰ期愈合,无股神经和坐骨神经损伤、下肢深静脉血栓形成等并发症发生。3例患者术后1个月发生髋关节脱位,2例腰麻下切开复位,1例手法复位后无再脱位。患者术后疼痛症状均明显缓解或消失,末次随访时髋关节Harris评分为(82.5±8.2)分,与术前比较差异有统计学意义(P=0.002)。X线片提示髋臼假体均无骨溶解、松动,所植异体骨与宿主骨融合,未见明显骨吸收区。[结论]采用髋臼加强环联合同种异体骨植骨技术,髋臼假体可获得满意的初始稳定,近期疗效满意,远期疗效尚需进一步观察。髋臼加强环联合同种异体骨植骨可成为严重髋臼骨缺损人工髋关节翻修时重建髋臼的方法之一。     

同种异体皮质骨板结合长柄翻修重建股骨严重骨缺损近期随访结果

髋关节置换术后需要进行翻修的患者中,PaproskyⅢ型和Ⅳ型股骨骨缺损的患者股骨干骺端存在严重骨缺损,不能为假体柄提供有效的近端支撑固定,单纯使用全涂层非骨水泥柄力学失败率较高.同种异体皮质骨支撑植骨可作为生物接骨板提供机械稳定性和生物稳定性.2006年1月至2008年12月我科使用同种异体皮质骨板移植结合长柄翻修PaproskyⅢ型和Ⅳ型股骨骨缺损23例,其中21例获得1～3年的随访,均取得满意的治疗效果,现报告如下.     

全髋关节翻修术中髋臼假体的选择和髋臼骨缺损的处理

目的探讨全髋关节翻修术中髋臼假体的选择和髋臼骨缺损的处理。方法2002年1月至2007年6月收治资料较完整的全髋关节翻修术患者共55例，其中行髋臼假体翻修术的患者有36例，男8例，女28例；年龄52～86岁，平均73岁。左髋13例，右髋23例。髋臼翻修原因：髋臼假体松动20例，髋臼和股骨假体均有明显松动12例；头臼不匹配2例；髋臼假体位置不良导致复发性脱位2例。髋臼骨缺损21例，按照美国矫形外科学会（AAOS）分类标准：Ⅰ型：节段性骨缺损6例；Ⅱ型：腔隙性骨缺损9例；Ⅲ型：混合型骨缺损6例。结果36例中，4例仅翻修髋臼侧假体，保留原股骨假体；3例更换了磨损严重的聚乙烯内衬，未予更换金属假体，其余29例均行全髋关节置换翻修术。髋臼骨缺损21例中，6例使用颗粒骨打压植骨＋骨水泥假体，2例为结构性和颗粒性打压植骨＋骨水泥假体，9例为结构性植骨＋颗粒打压植骨后，使用金属加强环＋骨水泥假体，1例为结构性植骨后，使用常规髋臼假体，3例仅对局部骨缺损部位进行植骨未予更换稳定的金属假体。随访时间6～68个月，平均39个月。Harris评分由术前的平均48分，提高至随访时平均89分。结论机械性磨损是人工髋关节松动翻修的主要原因；翻修时，假体的选择和骨缺损的处理要根据患者个体情况差异和术中具体情况综合考虑；周密的术前计划、准备多种类型髋臼假体供术中选择、充分自体和异体植骨是保证手术顺利进行的根本。     

组配式假体在Paprosky Ⅲ型股骨近端骨缺损翻修中的应用

[目的]报道应用组配式远端固定生物型假体翻修Paprosky Ⅲ型股骨近端骨缺损的手术要点及疗效. [方法]2003年5月～2006年10月应用MP、ZMR组配式股骨假体翻修Paprosky Ⅲ型股骨近端骨缺损9例,男5例,女4例,年龄39～65岁,平均57岁,术后随防时间8～34个月,平均19个月.翻修原因:7例为骨水泥固定假体松动、骨溶解,2例为珊瑚面假体无菌性松动.原手术到翻修时间最短4年,最长12年.依据Papresky分型,ⅢA型5例,ⅢB型4例. [结果]Harris评分:术前平均35分(28～54分),术后85分(70～90分).7例弃拐行走,2例存在大腿疼痛,其中1例轻度疼痛伴下肢短缩2.5 cm,需扶手杖行走,1例中度疼痛,扶单拐行走、跛行.本组随访过程中均无再松动、感染征象,1例发生假体下沉12 mm,股骨柄远端无骨溶解现象. [结论]组配式远端固定生物型假体可较好完成Paprosky Ⅲ型股骨骨缺损的翻修,能达到初期及后期稳定.由于假体的假体柄与假体近端部分分开,使其植入变得容易,多部件组配可方便解决各种可能问题,如偏心距、前倾角、肢体长度等,明显简化了手术,且手术安全性好,是较理想的股骨翻修假体.     

Revision total hip replacement using a cementless interlocking distal femoral stem with allograft-cemented composite and the application of intramedullary and onlay cortical strut allografts: two case reports

It is often difficult to perform repeated revision total hip replacement (re-THR) after prosthesis loosening stemming from infection, mechanical loosening, and osteolysis. Reasons for this include the size of the bone defect and poor quality of the remaining bone. We have previously performed revision surgery using a cementless interlocking distal femoral stem with segmental cortical allograft-cemented composite for reconstruction in the presence of circumferential bone loss of the proximal femur according to Gustilo classification type IV [1]. However, in the case where the distal femur had a stovepipe canal due to osteoporosis, osteolysis, and infection, it was difficult to achieve stable fixation to the distal femoral cortical bone using a cementless interlocking distal femoral stem. Therefore, a cortical strut allograft is inserted into the femoral bone canal on the medial side, followed by the insertion of an interlocking stem. A further cortical strut allograft is inserted on the lateral side of the distal femur. In addition, the distal onlay allograft should pass over the allograft–host bone junction. The two allografts are finally secured with interlocking screws. The bone allografting to augment femoral bone deficiency was performed using mainly cadaveric bone allografts obtained from our bone bank [2, 3]. In this report, we describe two cases of re-THR involving the use of intramedullary and onlay cortical strut allografts with a cementless interlocking distal femoral long stem to achieve favorable fixation stability. The two patients were asked if the data from the case could be submitted for publication, and both gave their consent     

Cemented versus cementless revision femoral stems using morselized allograft--a prospective, randomized study with 5 years follow-up

BACKGROUND: There are only few studies on hip revision using the impaction grafting technique. Furthermore, data on cementless femoral stems as compared to cemented and polished femoral stems are lacking. We wanted to determine whether cementless femoral stems were equally good in preserving bone mineral density around the femoral stem and in functional outcome. METHOD: Consecutively 14 patients needing hip revisions for aseptic loosening in the stem with bone stock deficiency Paparowsky grade II were randomized into two groups intraoperatively. Morselized fresh-frozen bone allografts were impacted in both groups. The cemented group received polished Landos Fjord-CrCo stems and the uncemented group received the hydroxyapatite-coated Landos Corail-Titan stems. The dual energy X-ray absorptiometry was used to measure bone mineral density around the femoral stem according to Gruen zones. Function was measured by Merle d'Aubigné score. Patients were controlled at 0.5, 3, 6, 9, 12, 18, 24, 36 and 60 months postoperatively. RESULTS: There was no statistical difference between the BMD loss in the cemented vs. the uncemented group. The BMD loss was between 0-10 % in distal Gruen zones and was between 10-20 % in proximal Gruen zones. Functional scores were similar and reached a plateau of 16 in the Merle d'Aubigné score after 6 months. CONCLUSIONS: Cemented technique in hip revisions using morselized bone allograft is as good as uncemented technique in preserving BMD measured by the DEXA method and restoring function in a 5 years follow-up.     

Good performance of a titanium femoral component in cementless hip arthroplasty in younger patients

We performed 97 uncemented primary total hip arthroplasties in 80 patients having an average age of 50 years. The femoral implant was a titanium stem with a proximal circumferential plasma spray-coating. Three different acetabular components were used: a threaded and partly porous-coated design in 70% of the cases. The average follow-up period was 8 years. 1 stem was revised 9 years after insertion due to a comminuted fracture of the proximal femur, 1 stem was revised 9 years after insertion due to a deep infection. No stem revisions were due to aseptic loosening. 1 femora had areas of distal osteolysis associated with a deep infection, but no signs of proximal loosening. 3 femora had areas of minor proximal osteolysis. 16 acetabular components (14 threaded) had been revised in 13 patients. The average Harris hip score was 91 points at the latest follow-up We conclude that the uncemented titanium femoral component with a circumferential porous coating performed well in these patients, most of whom were young. As reported previously, aseptic loosening of threaded acetabular components was common.     

Effects of stem length on mechanics of the femoral hip component after cemented revision

Bone loss in the proximal femur at the time of revision hip arthroplasty for a failed primary cemented femoral component can substantially reduce the stability of the revision stem, Use of an extended-length femoral component has been suggested to aid in achieving long-term fixation; however, the optimal stem length is unknown, A three-dimensional finite element model of a charnley-type revision femoral component in a sclerotic shell of cortical bone devoid of cancellous bone was developed, and five different stem lengths ranting from 140 to 273 mm were used. The interface between the sclerotic bone and cement mantle consisted of fibrous tissue. Distal to the sclerotic bone, bonding was allowed between the cement and bone. Relative motion between the cement and bone was reduced substantially when the stem extended beyond the original defect. Maximum principal stresses in the proximal cement mantle decreased from 7.7 to 5.5 MPa, but cement stresses near the distal tip increased from 7.9 to 10.7 MPa when the stem just bridged the defect. Further increases in stem length reduced the distal cement stresses. Increases beyond two femoral diameters had a minor effect on changes in relative motion, cement mantle stresses, and stresses across the cement-bone interface. The results suggest that a femoral component that extends beyond the area of cancellous bone defect by two femoral diameters will be most effective in minimizing stresses and motion that could be associated with clinical loosening of the cemented revision. A shorter stem that just bridges the cancellous bone defect left from the primary procedure may not provide adequate distal fixation due to high cement-bone shear stresses.     

Good performance of a titanium femoral component in cementless hip arthroplasty in younger patients97 arthroplasties followed for 5-11 years

We performed 97 uncemented primary total hip arthroplasties in 80 patients having an average age of 50 years. The femoral implant was a titanium stem with a proximal circumferential plasma spray-coating. Three different acetabular components were used: a threaded and partly porous-coated design in 70% of the cases. The average follow-up period was 8 years. 1 stem was revised 9 years after insertion due to a comminuted fracture of the proximal femur, 1 stem was revised 9 years after insertion due to a deep infection. No stem revisions were due to aseptic loosening. 1 femora had areas of distal osteolysis associated with a deep infection, but no signs of proximal loosening. 3 femora had areas of minor proximal osteolysis. 16 acetabular components (14 threaded) had been revised in 13 patients. The average Harris hip score was 91 points at the latest follow-up We conclude that the uncemented titanium femoral component with a circumferential porous coating performed well in these patients, most of whom were young. As reported previously, aseptic loosening of threaded acetabular components was common.     

Cementless revision total hip arthroplasty without allograft in severe proximal femoral defects

This study evaluates the difficult reconstructive challenge of severe proximal femoral bone loss. We present intermediate-term results of 46 hips with extensive proximal femoral bone loss that underwent revision total hip arthroplasty using cementless distal fixation without supplemental allograft. All were evaluated with the Harris hip score at a minimum of 2 years. Radiographs were assessed using the Engh fixation scale. At a mean of 6.4 (range 2-12) years, 43 of the 46 prostheses were functioning well. Two patients required revision for symptomatic loosening, and 1 prosthesis remains radiographically loose with a fair clinical score. Mean Harris hip score was 77 at last follow-up. There were 6 intraoperative femur fractures, 9 dislocations, 10 cases of severe stress shielding, and no infections.     

Good performance of a titanium femoral component in cementless hip arthroplasty in younger patients: 97 arthroplasties followed for 5-11 years

We performed 97 uncemented primary total hip arthroplasties in 80 patients having an average age of 50 years. The femoral implant was a titanium stem with a proximal circumferential plasma spray-coating. Three different acetabular components were used: a threaded and partly porous-coated design in 70% of the cases. The average follow-up period was 8 years. 1 stem was revised 9 years after insertion due to a comminuted fracture of the proximal femur, 1 stem was revised 9 years after insertion due to a deep infection. No stem revisions were due to aseptic loosening. 1 femora had areas of distal osteolysis associated with a deep infection, but no signs of proximal loosening. 3 femora had areas of minor proximal osteolysis. 16 acetabular components (14 threaded) had been revised in 13 patients. The average Harris hip score was 91 points at the latest follow-up. We conclude that the uncemented titanium femoral component with a circumferential porous coating performed well in these patients, most of whom were young. As reported previously, aseptic loosening of threaded acetabular components was common.     

交锁翻修柄在股骨侧假体翻修术的应用

目的 报道采用交锁翻修柄(Bicontact和Kent)进行在全髋关节股骨侧假体翻修手术的疗效。方法 12例股骨侧假体翻修手术(假体松动5例，假体周围骨折7例)均采用现代无骨水泥技术，Bictintact翻修柄8例，Kent翻修假体4例，结合金属网、钢丝线缆握紧系统器械和异体骨移植进行结构重建。结果 平均随访8．40个月，功能优良10例(83．34％)，可1例(8．33％)，差1例(8．33％)，后出现Bicontact假体柄断裂和股骨干骨折。结论 在老年患股骨侧假体翻修术中，运用交锁翻修柄(Bicontact和Kent)能使手术时间和创伤减少，股骨侧固定快且牢固，并允许患早期进行功能锻炼；在股骨近端广泛骨缺失而需要大块异体骨移植进行重建的情况下，交锁翻修柄解决了既往各种假体较难固定于异体植骨块和残留的受体股骨中的问题。     

Poor intermediate-term survival of the uncemented Optan anatomically adapted femoral component: A retrospective study of 432 patients with a mean follow-up of 5 years

Purpose

We evaluated the 5-year survival of the uncemented Optan anatomically adapted femoral stem, with revision for aseptic loosening as the endpoint.

Methods

Between January 2004 and March 2007, 432 total hip arthroplasties (THAs) were performed in 432 patients. After follow-up for a mean time of 5 years, the patients were evaluated using the WOMAC questionnaire and plain radiography. Patients who were unable to attend the follow-up visit were contacted by telephone to determine whether they had had any revision surgery of their THA

Results

Within 5 years, 39 patients (9%) had died of unrelated causes and 63 patients (15%) had been lost to follow-up. Of the remaining cohort, 224 patients (68%) had full follow-up while 88 patients (27%) were evaluated with WOMAC only and 18 patients (5%) were evaluated with radiography only. The mean WOMAC score of all evaluated patients was 21 (10–100). At 5-year follow-up, there were 26 stem revisions reported (6%), 14 hips (3%) showed aseptic loosening, and 12 hips (3%) had had a periprosthetic femoral fracture. The 5-year survival to revision for any reason was 94%. Worst-case analysis yielded a 5-year survival of 79%.

Interpretation

The 5-year survival for aseptic loosening of the Optan anatomically adapted femoral component was disappointing. Radiographic evaluation showed evidence of proximal radiolucencies and distal cortical bone hypertrophy, which we attribute to insufficient proximal bone in-growth and increased load transfer at the tip of the stem. We do not recommend the use of the Optan femoral stem.The Optan femoral stem was designed to reduce proximal femoral bone loss after total hip arthroplasty (THA). It was designed with a specific geometry, stiffness, and surface roughness (Bieger et al. 2011). It is an anatomically shaped femoral component in the sense that it has an anteversion similar to that of the native proximal femur. The uncemented Optan femoral stem is made of a titanium-based alloy with a porous-coated proximal third. Furthermore, the femoral stem has a ventral rib that should prevent rotation. The distal narrowing, the anatomical shape, and the porous-coated proximal third of the stem are designed to lead to a physiological load transfer and therefore optimal bone in-growth of the femoral stem. Despite the theoretical advantages of the Optan femoral stem, no studies have been published on the survival of this uncemented femoral component. We evaluated the mean 5-year survival of the uncemented Optan femoral stem used in primary THA.