股骨皮质骨开窗技术在髋关节翻修术中的应用

目的 探讨股骨前外侧皮质骨开窗技术在髋关节翻修术中取出股骨远端稳定固定骨水泥的价值.方法 2005年5月至2009年6月,共14例(14髋)因各种原因致髋关节置换术后失败患者接受全髋关节翻修手术.其中男性10例,女性4例,年龄54～75岁,平均66岁.翻修原因为股骨头置换术后髋臼磨损5例、全髋关节置换术后假体周围骨溶解并松动6例、骨水泥柄股骨近端骨溶解柄断裂1例、髋臼骨溶解假体松动翻修同时行股骨柄翻修1例,感染后二期翻修时远端骨水泥取出困难1例.14例(14髋)股骨柄均为骨水泥同定.术中按术前计划开窗部位、开窗范围于股骨皮质骨开一长方形骨窗.通过骨窗直视下彻底清除髓腔内稳定固定的骨水泥,修整股骨髓腔.植入翻修柄后将皮质骨开窗骨瓣原位回植,双股钢丝捆绑固定.术后定期随访拍摄x线片.观察皮质骨开窗骨瓣与周围骨愈合情况、骨瓣有无移位、股骨柄有无下沉以及有无捆绑钢丝断裂等.结果 10例患者术后获得随访,平均随访时间24.6个月.股骨皮质骨开窗长度2.5～6.0 cm,平均3.4 cm,宽度0.8～1.4 cm,平均1.2 cm.股骨开窗远端以远部分发生纵形劈裂骨折1例.无术中皮质骨穿孔及股骨干骨折.向远段扩大开窗1例,扩大长度1.5 cm.开窗部位皮质骨骨瓣原位回植选择2～3道双股钢丝固定,平均2.3道.随访期间2例发牛假体柄下沉(平均2.5 mm),无皮质骨瓣移位以及捆绑钢丝断裂,术后3～5个月皮质骨瓣已于周围骨纤维愈合.随访期间无一例因各种原因致再次翻修.结论 股骨皮质骨开窗技术在髋关节翻修术中有助于直视下彻底取出股骨髓腔远端稳定固定的骨水泥,同时不会造成股骨骨丢失、不影响翻修柄植入后的稳定固定.     

大转子延长截骨在股骨柄翻修术中的应用

目的 报道大转子延长截骨在股骨柄翻修术中的应用及其疗效。方法 从 1998年 1月～ 2000年 1月,采用大转子延长截骨术取出股骨柄、骨水泥,行翻修术 11例。男 7例,女 4例。年龄 53～ 69岁,平均 65.4岁。翻修原因 :股骨柄断裂 2例,人工股骨头置换术后髋臼骨关节炎 8例,假体位置异常 1例。结果 11例患者术后第 2 d均在助行器辅助下下床行走,术后 3个月大转子延长截骨处临床愈合后,改扶单拐行走, 6个月后弃拐行走。术后随访 6～ 30个月,大转子延长截骨处骨性愈合, Harris评分平均为 89.6分。结论 大转子延长截骨术多用于翻修术中取出固定牢固的骨水泥或非骨水泥假体柄。其适应证包括 :(1)股骨柄近端断裂,远端仍牢固固定者; (2)人工股骨头置换术后发生髋臼骨关节炎伴髋关节强直,股骨柄固定牢固,需行全髋翻修者; (3)股骨柄安放位置错误,但骨水泥固定良好者; (4)不伴有假体松动的早期严重感染需行翻修者。该方法显露充分,术后恢复快,是一种较好的股骨柄固定牢固的翻修方法。主要并发症有截骨处不愈合、移位及截骨片骨折。     

大转子延长截骨在全髋关节翻修术中应用的临床评价

目的 回顾性研究采用大转子延长截骨(extended troehanteric osteotomy,ETO)行全髋关节翻修术后股骨柄的位置变化,评价ETO在股骨假体稳定件髋关节翻修术中的作用.方法 1998年1月至2007年6月,采用ETO对股骨柄或骨水泥壳固定稳定性全髋关节33例33髋进行翻修.翻修术后采用Harris评分和MOMAC评分评估髋关节功能,摄动态X线片观察截骨块愈合、假体位置改变及股骨柄与股骨髓腔匹配等情况.结果 25例随访12～103个月,平均63个月.Harris评分由术前平均38.4分,提高到末次随访时88.7分;WOMAC评分由术前平均56.2分,降至末次随访时42.8分.大转子截骨块均在术后4～10个月骨性愈合.3例发生股骨柄下沉.平均3.4mm.股骨柄假体出现外翻、内翻各1例.无术中或术后骨折、钢丝断裂、感染、假体周围骨溶解以及异位骨化发生.术后关节脱位1例.结论 对假体固定稳定性股骨柄进行翻修,采用ETO有利于假体的安全取出,术后截骨块愈合率高,延长截骨不影响假体稳定性.股骨柄下沉、位置改变、截骨块骨折等并发症发生率低.     

扩展型转子截骨技术在骨水泥型股骨柄翻修中的临床应用

目的探讨扩展型转子截骨技术在较困难的骨水泥型股骨柄翻修手术中的作用和临床效果。方法2002年2月至2006年5月采用扩展型转子截骨翻修股骨侧假体12例，应用扩展型转子截骨技术取出所有骨水泥和假体柄，重新植入翻修用假体柄，以多道金属线缆环扎固定。其中1例选择的是骨水泥股骨假体，11例是非骨水泥股骨假体。结果所有患者均获得随访，时间16～24个月，术后6个月所有截骨处均愈合，无大转子移位。Harris评分由术前平均（48．4±7．5）分上升至术后平均（89．3±8．1）分（为术后1年的评分），假体无松动、下沉、假体周围未见骨吸收、骨溶解。结论扩展型转子截骨对骨水泥取出困难的股骨侧翻修术具有骨水泥取除彻底，安全可靠，手术时间短，并发症少的优点。     

股骨近端粗隆间后侧纵形截骨法在全髋关节翻修术中的应用

目的 探讨股骨近端粗隆间后侧纵形截骨在全髋翻修术中应用的初步经验.方法 2005年9月至2009年12月对35例患者应用股骨近端粗隆间后侧纵形截骨法取出股骨侧假体,截骨长度约11～14 cm,宽约1 cm.翻修假体为生物固定型组合式翻修假体,腔隙性骨缺损采用了颗粒异体骨植骨,钢丝环扎固定复位截骨块.对手术前、后Harris评分、肢体长度以及影像学改变进行评估.术前Harris评分平均30分(19～40分),其中疼痛评分平均12分(10～20分).结果 35例患者术后平均随访15个月(5～55个月).术后Harris评分平均85分(80～92分),其中疼痛评分平均40分(30～44分).股骨截骨处及植骨均愈合,平均愈合时间约20周(10～32周).未发生钢丝滑脱、感染、脱位、假体松动等并发症.结论 短期随访表明,股骨近端粗隆间后侧纵形截骨法有利于股骨假体的显露和取出,便于髓腔清理以及股骨侧重建,在全髋翻修术中是一种操作相对容易、有效町靠的方法.     

股骨大转子延长截骨在假体稳定股骨柄翻修中的应用

目的 评估大转子延长截骨在股骨假体固定稳定型全髋关节翻修术中应用的中期临床效果.方法 1998年1月至2005年6月对27例患者(27髋)采用大转子延长截骨对股骨柄和(或)骨水泥壳固定稳定的全髋关节翻修.临床随访评估包括Harris评分和WOMAC评分,术前Harris评分平均42.7分,WOMAC评分平均55.6分;影像学评估包括术后拍摄X线片,对比观察截骨块愈合时间、是否存在截骨延迟愈合或不愈合,截骨块是否发生移位以及假体是否下沉等.结果 共19例患者(19髋)获得随访,平均随访时间5.3年.无一例发生术中或术后骨折.术后Harris评分平均87.3分,WOMAC评分平均46.3分.所有患者大转子截骨块均于术后6个月内愈合.无股骨大转子截骨块向近端移位,3例发生股骨柄下沉,平均下沉3.4 mm,无钢丝断裂.结论 对于假体固定稳定型股骨柄翻修,采用股骨大转子延长截骨有利于手术操作和翻修假体的植入和固定,有利于截骨块的愈合,降低术中、术后并发症发生率,中期疗效显著.     

广泛微孔涂层非骨水泥假体治疗Vancouver B2型假体周围骨折

目的 评价广泛微孔涂层非骨水泥长柄假体治疗Vancouver B2型股骨假体周围骨折的疗效.方法 2002年10月至2007年5月对10例初次全髋置换术后Vancouver B2型假体周围骨折患者采用广泛微孔涂层非骨水泥长柄假体予以翻修,其中初次置换股骨柄为骨水泥固定者4例,非骨水泥固定6例.结果 10例患者均获随访,平均随访时间44个月(12～67个月),Harris评分平均为87.6分.所有患者骨折均愈合,骨折平均愈合时间4.6个月.8例骨长入稳定,2例纤维稳定,无假体松动和下沉,1例出现大腿痛,3例股骨近端出现应力遮挡.结论 广泛微孔涂层长柄非骨水泥假体治疗Vancouver B2型假体周围骨折,很好地控制了骨折端轴向和旋转稳定性,且骨与假体有很好的骨整合,为骨折的愈合提供了良好的环境,骨折愈合率高.     

广泛微孔涂层非骨水泥假体在股骨翻修的应用

目的报告采用广泛微孔涂层非骨水泥股骨假体对失败的骨水泥固定股骨假体翻修的近期效果。方法1998年至2003年,对20例骨水泥固定型人工髋关节置换后无菌性松动的股骨假体采用广泛微孔涂层假体进行翻修。翻修前使用国产假体18例,进口假体2例;全髋关节置换14例,人工股骨头置换6例。所有假体均为骨水泥固定,早期骨水泥技术固定18例,第二代骨水泥技术固定2例。原始疾病为股骨头无菌性坏死14例,股骨颈骨折6例。从初次关节置换到翻修手术的时间最短5年,最长17年,平均11.5年。其中4例患者为再次翻修。根据Paprosky分型,Ⅰ型3髋,Ⅱ型6髋,ⅢA型11髋。翻修假体,AML(DePuy)5髋,Solution(DePuy)7髋,Full-coated(Zimmer)6髋,Perfecta延长柄(WrightMed)2髋。翻修时患者平均年龄64岁(41～77岁),术后平均随访时间40个月(18～60个月)。结果Harris评分从术前平均34分改善为术后平均85分。根据Engh骨长入分级标准评定,术后X线表现骨性固定17例,稳定性纤维固定3例。无一例因松动需要再翻修的病例,骨皮质密度和厚度均明显增加。结论广泛微孔涂层假体在股骨干骺端和股骨髓腔同时存在缺损时,可以在相对正常的股骨远端髓腔获得轴向及抗旋转初始稳定,为骨长入和生物学固定创造条件。     

混合型初次全髋关节置换术中骨水泥柄10年以上的随访研究

目的回顾性分析混合型初次全髋关节置换术（THA）中骨水泥柄的临床和影像学疗效及其相关影响因素。方法对1999年1月至2001年12月期间接受混合型初次THA治疗髋部疾病的患者126例（135髋）进行至少10年的随访。观察Harris评分、股骨假体位置、骨水泥壳及其周围骨质变化。假体生存率采用Kaplan-Meier方法进行分析,以无菌性松动导致翻修及单纯骨溶解病灶清除植骨术为随访终点。结果共有79例（85髋）获得10年以上随访。Harris评分由术前（44.5±18.8）分提高至末次随访时（92.1±5.6）分。截至随访终点,在Gruen 1区观察到2髋发生骨溶解,7区4髋发生骨溶解现象。共有4例（4髋）接受翻修手术,其中1例男性患者因骨溶解致髋臼假体松动,同侧股骨近端骨溶解,同期行右髋臼侧翻修及股骨侧骨溶解病灶清除植骨术。另3例因髋臼假体松动行髋臼侧翻修术,影像学及术中见股骨假体稳定。以无菌性松动为随访终点,股骨假体生存率为100%;以无菌性松动翻修、单纯骨溶解病灶清除植骨术为随访终点,股骨假体生存率为98.8%（95%可信区间,12.23~12.32）。结论混合型初次THA术中骨水泥假体的远期生存率令人满意;采用第3代骨水泥技术固定的股骨柄取得与现代非骨水泥假体柄相近的远期生存率。     

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。     

The use of a hydroxyapatite-coated primary stem in revision total hip arthroplasty

Proximal ingrowth of femoral components in total hip arthroplasty (THA) is desirable because it minimizes proximal stress shielding associated with distal ingrowth stems and maximizes bone stock. This is a retrospective evaluation of initial results of revision THA using a proximally hydroxyapatite-coated femoral stem nominally designed for primary use. Patients requiring femoral stem revision were included if they had sufficient femoral bone stock to support a proximally fixed prosthesis (n = 33). This represents 53% of the femoral revisions performed during the period of the study. The average follow-up was 5 years (range 48-88 months). The mean Harris hip and Oxford hip scores were 86.5 and 25.2, respectively. Radiographically, 100% of the stems demonstrated bone ingrowth fixation. These results are superior to previous reports of primary cementless stems for revision THA. The use of a cementless nonmodular implant provides a viable option in some patients undergoing revision THA.     

Distal locking stem for revision femoral loosening and peri-prosthetic fractures

Revision total hip arthroplasty in the setting of a large proximal femoral deficiency or a peri-prosthetic fracture remains a challenging problem. We describe the development, surgical technique and the use of cementless revision stems with distal inter-locking screws to provide immediate stability of the femoral implant. Results were assessed in a large multicentre French study conducted with the french hip and knee surgery society (SFHG). We retrospectively reviewed 725 revisions using interlocking stems from 14 French orthopaedic departments. Seven different stems were used in this series. In-patient records were retrieved, and in addition to demographic data the indication for revision, the preoperative and postoperative PMA and Harris hip scores were documented. The bone deficiency was classified on the basis of the French National Orthopaedic Meeting (SOFCOT) classification. Intraoperative complications and problems if any were retrieved from operative notes. Clinical status and radiographs at the final follow-up were evaluated, paying special attention to the metaphyseal filling index. Average follow-up was 4.5 years. As for the clinical results, the mean Harris hip score at last follow-up was 81. Therefore, it increased by an average of 31 points. Bone reconstruction was assessed on the cortico-medullary index in the metaphyseal area and at mid-shaft increasing from 36 to 45 and 54 to 63, respectively. Radiologically, 637 implants were stable, and 40 demonstrated subsidence. Forty-eight implants have been revised. We found a significant relation between the metaphyseal filling index, the stability of the stem and the quality of bone reconstruction. Results were analysed with respect to three groups of stems: group 1 was a straight, partially HA-coated implant; group 2 was a curved, fully HA-coated implant; and group 3 was a curved, partially-coated implant. Group 1 showed a significantly higher rate of failure when compared with the others types of implants. Group 2 had better functional results than group 3, which in turn reported better results than group 1. With regard to implant fixation, group 2 had significantly better results. Both groups 2 and 3 induced less thigh pain than group 1. The distal interlocking stem has shown promising results for femoral revisions. The advantages are initial axial and rotational stability and consistent bony in-growth owing to hydroxyapatite coating. Distal locked stems are mainly indicated to treat complex femoral revision with severe bone loss and peri-prosthetic fractures.     

Cementless hip arthroplasty in Paget's disease at medium-term follow-up (average of 6.7 years)

We performed 33 cementless total hip arthroplasties for arthritis in 27 patients with an established diagnosis of Paget's disease on the acetabular or femoral side of the hip. There were 3 revisions. One stem for aseptic loosening at 55 months, and 2 stems after periprosthetic fractures at 9 and 70 months. Twenty-three cases were available for follow-up at an average of 6.7 years (range, 2-14 years). Harris hip score improved from 56/100 preoperatively (16-98/100) to 90/100 postoperatively (78-100/100). All surviving components were radiographically bone ingrown. Based on our findings, it appears that a cementless total hip arthroplasty can have a good outcome in Paget's disease.     

Periprosthetic femoral fractures treated with a modular distally cemented stem

PURPOSE: To assess the treatment outcome of revision hip arthroplasty for Vancouver type B3 periprosthetic femoral fractures using a modular distally cemented stem. METHODS: 22 men and 14 women (37 hips) aged 66 to 79 (mean, 70) years underwent revision hip arthroplasty for Vancouver type B3 periprosthetic femoral fractures. The indication for surgery was periprosthetic fracture with stem loosening and loss of proximal bone stock. The patients were referred from other hospitals after previous surgeries had failed: 8 with 3 previous surgeries, 19 with 2, and 9 with one. Using a transtrochanteric approach, the existing prosthesis was removed and a modular proximal femoral replacement stem was inserted, bypassing the area of proximal femoral fracture and bone loss. The stem was distally cemented. Patients were immobilised within 48 hours of surgery. RESULTS: Patients were followed up for a mean of 14 (range, 8-18) years. The mean Harris hip score improved from 29 (range, 5-40) to 78 (range, 56-88); 24 patients attained excellent or good scores (>80), 10 attained fair, and 2 attained poor scores. The mean healing time was 7 (range, 6-14) months; there was no non-union. Improvement in proximal bone stock was noted on serial radiographs. None of the stems had cement fracture or migration, requiring revision. Two (5%) of the patients had dislocations. CONCLUSION: Vancouver type B3 periprosthetic femoral fractures can be successfully treated with a distally cemented modular proximal femoral replacement prosthesis.     

全髋关节置换术后股骨假体周围骨折的治疗

目的：分析全髋关节置换术后股骨假体周围骨折的病因和治疗结果．探讨其治疗方法。方法：回顾性研究自1998年12月-2003年3月治疗并随访观察的11例全髋关节置换术后股骨假体周围骨折患者，男8例，女3例，平均年龄为56岁(43-75岁)，采用Vancouver分型，A型2例，B2型7例．B3型1例，C型1例。采用非手术治疗5例；手术治疗6例，其中1例为非手术治疗后骨折畸形愈合行翻修术。采用长柄假体翻修联合异体皮质骨板固定5例．其中使用非骨水泥型远端固定假体4例．使用骨水泥型假体1例。采用切开复位内固定治疗1例。结果：所有病例均获随访，平均随访25．6个月(7～50个月)。9例骨折愈合，平均愈合时间4个月(3-6个月)，2例骨折未愈合。均为非手术治疗病例，手术治疗6例骨折均愈合。至目前为止，7例假体稳定，1例翻修术后出现连续的影像学透亮线．3例假体松动，假体稳定的患者功能好于假体松动者．假体稳定患者的Harris评分平均91分。所有异体皮质骨板在1年内均与宿主骨整台．没有异体皮质骨板骨折发生。结论：假体稳定的A型骨折可以采用非手术治疗。对于B1型和C型骨折，如无手术禁忌证，应行切开复位内固定术。对于假体松动的骨折患者，使用长柄远端固定非骨水混型假体联合异体皮质骨板是最佳的治疗方法。     

Extensively porous-coated stems for femoral revision: reliable choice for stem revision in Paprosky femoral type III defects

Between January 1999 and August 2008, ninety-six femoral revisions were performed with extensively porous-coated stems in Paprosky type III femoral defects (89 type IIIA and 7 type IIIB defects). Seven type IIIB defects with a mean canal of 16.5 mm were observed; 6 defects achieved stable bone ingrowth and 1 achieved stable fibrous condition. Average postoperative Harris Hip Score was 92.3±8 (range, 77-100), and all scores improved postoperatively. At a mean follow-up of 65.7 months, 92 stems achieved bone ingrowth, and 1 stem (type IIIB) achieved a stable fibrous condition. Three patients died from causes unrelated to the surgery during follow-up. The most frequent diagnosis for revision of the femoral component was loosening of the cementless stem (53 patients; 55.2%), followed by status after a Girdlestone procedure (21 patients; 21.8%), after total hip arthroplasty with acetabular wear (10 patients; 10.4%), loosening of the cemented stem (7 patients; 7.3%), and periprosthetic fracture (5 patients; 5.2%). The authors performed 65 total hip arthroplasty revisions, 23 femoral component revisions, and 8 revisions of femoral components with cemented liners in patients with well-fixed acetabular shells. Extensively porous-coated stems in femoral revision for Paprosky type III femoral defects provided good mid-term durability.     

Experiences with the BiCONTACT revision stems with distal interlocking

The first consecutive 68 revision total hip arthroplasties of a cementless distal interlocking femoral stem (BiCONTACT; Aesculap AG, Tuttlingen, Germany) are included in this study. Average follow-up time was 40 months (range, 36-49 months). At follow-up evaluation, one patient had died, and one could not be located. The average Harris hip score improved from 60 points to 88 points. All cases showed radiographic evidence of a bone ingrown prosthesis, and no subsidence was seen. No osteolysis and no radiologic loosening were noted. No repeat revision was needed during the follow-up period. The results of the distal interlocking femoral stems (BiCONTACT) in cementless revision total hip arthroplasty were satisfactory. These findings suggest that a diaphyseal fixation of the revision femoral stem with distal interlocking screws can provide primary axial and rotational stability of the prosthesis in revision surgery.     

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.     

全髋关节置换术后股骨假体周围Vancouver B型骨折治疗的随访研究

目的 探讨全髋关节置换术后股骨假体周围Vancouver B型骨折治疗方法的选择,总结同种异体皮质骨板移植重建股骨假体周围骨折的临床效果.方法 22例全髋关节置换术后股骨假体周围骨折患者,男7例,女15例;年龄平均65岁(53～75岁).Vancouver分类B1型5例,B2型4例,B3型13例.B1型骨折采用异体皮质骨板移植加钢丝环扎治疗;B2型骨折选择加长股骨柄翻修;B3型骨折选择骨水泥柄翻修,加同种异体皮质骨板移植和钢丝环扎同定.所有患者均获得随访,随访时间平均67个月(37～95个月).采用Harris髋关节功能评分、X线片、外周血T淋巴细胞亚群、抗体免疫复合物检测 和核素骨显像对治疗结果进行评价.结果 22例患者骨折全部愈合,21例患者能自由行走,1例需要助 行器帮助.末次随访Harris评分平均89分(79～93分).患者未发生免疫排斥反应;术后3个月,骨折愈合,术后12个月,移植骨板与宿主骨骨性愈合,股骨皮质厚度增加3～5mm;核素骨显像骨板移植区放射性核素分布较对侧浓集.3例患者移植骨板出现部分吸收现象.术后2年.骨板与宿主骨融合,移植骨板吸收停止.结论 针对股骨假体周围骨折不同类型分别采取不同方法治疗能够取得较好疗效,同种异体皮质骨板移植在维持骨折稳定性、促进骨折愈合、增加局部骨量和改善骨强度方面有较好疗效.     

Two-year to five-year follow-up of femoral defects in femoral revision treated with the link MP modular stem

Femoral deficiency has been shown to adversely affect the results of revision total hip arthroplasty. Tapered titanium modular stems allow distal fixation of the fluted, conical portion of the implant in the setting of proximal bone loss. One hundred two consecutive hips with proximal bone loss underwent revision femoral reconstruction between 1998 and 2002 at 3 centers using the Link MP modular stem. Forty-three hips had Mallory type 3C femoral deficiency. Ninety-seven hips were observed for an average of 45 months (range, 24-72; median, 36 months). Clinically, mean Harris hip score improved from 36 to 84 (range, 54-99). Radiographically, 93 hips were considered stable, with no circumferential lucencies at the distal fixation surface. Three hips migrated and required revision, along with one periprosthetic fracture. Five other hips had nonprogressive migration of 1 to 2 mm.