1、CURRENT CONCEPTS IN JOINT REPLACEMENT TM SPRING 2004 The course objectives are:To facilitate faculty/participant discussion on contemporary hip,knee and shoulder arthroplasty use inclusive of design concepts,material advances and clinical results.To present solutions to difficult hip,knee and should
2、er management problems as well as surgical techniques which assist their solution.To evaluate the use of current fixation methods in primary and revision procedures including cement,hydroxyapatite,porous coated,press fit and impaction grafting applications.To address current concerns regarding impla
3、nt material limitations and biologic response as well as identify clinical intervention strategies.使会议参加者对当前髋关节、膝关节及肩关节的成形进行讨论，包括设计概念、材料发展和临床效果。提出对疑难的髋关节，膝关节肩关节如何解决的问题，以及相关的外科技术。评价当前的固定方法在原发和翻修操作步骤的应用，包括骨水泥压迫嵌入、压迫移植应用。发表当前一些新概念，如材料的研制、生物反应、以及确认临床发展的方向。Hip Arthroplasty:I.Introduction A.Demographics M
4、ore than 220,000 fractures of the hip occur each year in North America.Cost-greater than 9 billion dollar health care costs per year.eterogeneous patient population-some patients are active community ambulators but many are nursing home residents.B.Issues Optimal treatment of displaced femoral neck
5、fractures remains controversial.General agreement that patients regardless of age with non-displaced or valgus impacted fractures(stable)will be treated with internal fixation.General agreement that healthy patients 60 years or younger are good candidates for internal fixation.However,treatment of p
6、atients older than 60 years of age is controversial.C.Treatment Options Internal fixation Arthroplasty II.Questions 1.Which patients with displaced femoral neck fractures should be treated with internal fixation?Factors that should be considered include age,fracture type,activity level and overall h
7、ealth 2.Should patients being treated with an arthroplasty procedure receive a unipolar,bipolar or total hip arthroplasty?3.Is there evidence based information to support these decisions?III.Internal Fixation versus Prosthetic Replacement A.Clinical Data 1.Observational Studies Value limited by retr
8、ospective design,potential selection bias 2.Randomized trials Bias decreased by randomization However,randomized trials assessed a variety of different arthroplasty options which may not be clinically relevant today Small sample size:limit the ability of these trials to provide definitive guidance f
9、or the orthopaedic surgeon B.Meta Analyses(Cochrane database,Bhandari et al)1.Summary Results of Meta-Analyses Arthroplasty reduces the risk of revision surgery.Internal fixation-decreased blood loss,operative time,blood transfusion and risk of deep wound infection.Unfortunately,no definitive differ
10、ences were noted with respect to mortality,degree of residual pain,or functional levels between the two treatments 2.Primary Arthroplasty Versus Early Salvage After Failed Internal Fixation Conclusions:Patients undergoing internal fixation for a displaced femoral neck fracture need to be informed th
11、at if this treatment fails and that if a cemented hip is subsequently performed,the results may not be as good as a primary hip arthroplasty.(McKinley and Robinson,JBJS,2002)IV.Treatment Recommendations A.Internal Fixation Versus Arthroplasty 1.Young and healthy patients(less than 60 years of age)in
12、ternal fixation 2.Older patients-70 years of age or older-arthroplasty depending on activity level,overall health,bone stock 3.61-70 years of age-gray area,decision should be made based upon ability to obtain reduction,bone quality,general health,activity level and occupation.V.Arthroplasty Options
13、For Treatment of Displaced Femoral Neck Fractures A.Treatment Options 1.Decisions regarding treatment should be based on age,activity level quality of bone stock and overall health of the patient.2.Patients residing in nursing homes that are not community ambulators are probablybest treated with a u
14、nipolar arthroplasty as long as the hip joint is fairly well preserved B.Unipolar Versus Bipolar 1.Assessed in a number of randomized trials and retrospective reviews.Studies do not find a difference in overall outcomes or complication rates between unipolar and bipolar arthroplasty The extra cost m
15、ay not warrant the use of bipolar endoprosthesis in elderly patients.C.Cemented Versus Uncemented Arthroplasties 1.Assessed in a number of randomized studies but these studies were small and they are of variable quality.2.In general,cemented prostheses tend to provide better pain relief but it is no
16、t clear if this offsets the potential disadvantage with respect to cardiopulmonary issues when using cement in elderly patients.D.Total Hip Arthroplasty-Indications 1.Patients with moderate to severe degenerative changes of the hip.2.Based on the available data,it is difficult to determine if older patients with a femoral neck fracture will benefit from a THA.髋关节成形术髋关节成形术 I髋关节成形术髋关节成形术 A人口统计学人口统计学 1220000多例髋关节骨折发生于北美（每年）2费用，每年消耗900亿美元的保健费。3异源病人人口，有的病人是社区积极的活动者，有不少则是养老院的居住人员。B焦点焦点 1乐观治疗股骨颈移位仍有争论
