Metastatic Rectal Adenocarcinoma of the Hip and Knee Joints: A Case Series

Two cases are presented of patients with a history of metastatic rectal adenocarcinoma presenting with a painful joint effusion. Both cases are potential examples of metastasis to periarticular bone with local infiltration to the synovium, which is one proposed mechanism of intrasynovial metastasis. While skeletal metastases are a relatively common occurrence in metastatic adenocarcinoma, intraarticular metastasis is extremely rare. These cases highlight the need to consider metastasis in the differential of joint swelling in the setting of a history of adenocarcinoma.

Investigation of contact behavior on a model of the dual-mobility artificial hip joint for Asians in different inner liner thicknesses

BACKGROUND The four components that make up the current dual-mobility artificial hip joint design are the femoral head,the inner liner,the outer liner as a metal cover to prevent wear,and the acetabular cup.The acetabular cup and the outer liner were constructed of 316L stainless steel.At the same time,the inner liner was made of ultra-high-molecular-weight polyethylene(UHMWPE).As this new dual-mobility artificial hip joint has not been researched extensively,more tribological research is needed to predict wear.The thickness of the inner liner is a significant component to consider when calculating the contact pressure.AIM To make use of finite element analysis to gain a better understanding of the contact behavior in various inner liner thicknesses on a new model of a dual-mobility artificial hip joint,with the ultimate objective of determining the inner liner thickness that was most suitable for this particular type of dual-mobility artificial hip joint.METHODS In this study,the size of the femoral head was compared between two diameters(28 mm and 36 mm)and eight inner liner thicknesses ranging from 5 mm to 12 mm.Using the finite element method,the contact parameters,including the maximum contact pressure and contact area,have been evaluated in light of the Hertzian contact theory.The simulation was performed statically with dissipated energy and asymmetric behavior.The types of interaction were surface-to-surface contact and normal contact behavior.RESULTS The maximum contact pressures in the inner liner(UHMWPE)at a head diameter of 28 mm and 36 mm are between 3.7-13.5 MPa and 2.7-10.4 MPa,respectively.The maximum von Mises of the inner liner,outer liner,and acetabular cup are 2.4–11.4 MPa,15.7–44.3 MPa,and 3.7–12.6 MPa,respectively,for 28 mm head.Then the maximum von Mises stresses of the 36 mm head are 1.9-8.9 MPa for the inner liner,9.9-32.8 MPa for the outer liner,and 2.6-9.9 MPa for the acetabular cup.A head with a diameter of 28 mm should have an inner liner with a thickness of 12 mm.Whereas the head diameter was 36 mm,an inner liner thickness of 8 mm was suitable.CONCLUSION The contact pressures and von Mises stresses generated during this research can potentially be exploited in estimating the wear of dual-mobility artificial hip joints in general.Contact pressure and von Mises stress reduce with an increasing head diameter and inner liner’s thickness.Present findings would become one of the references for orthopedic surgery for choosing suitable bearing geometric parameter of hip implant.

Characterisation of wear particles from biomedical carbon/carbon composites with different preforms in hip joint simulator

A hip joint simulator was employed to predict the clinical wear behaviour of carbon/carbon （C/C） composites with needled carbon cloth preform and carbon felt preform. Wear particles generated from the two kinds of C/C composites were isolated and characterised by the size distribution and morphology. The evolvement of wear particles in the hip joint simulator was proposed. The results show that the wear particles from two kinds of C/C composites have a size ranging from submicron to tens of micrometers. The wear particles have various morphologies including broken fiber, fragment fiber, slice pyrolytic carbon and spherical pyrolytic carbon. C/C composites with needled carbon cloth preforms have larger size range and more broken fiber particles and slice pyrolytic carbon particles in comparison with C/C composites with carbon felt preforms. The evolvement of pyrolytic carbon particles is caused by surface regularization, whereas, the evolvement of carbon fiber particles is related to stress direction in the hip joint simulator.

保留假体清创联合更换组配式部件治疗全髋关节置换后急性假体周围感染

背景:全髋关节置换后假体周围感染是影响假体使用寿命的常见原因,保留假体清创联合更换组配式组件成为治疗全髋关节置换后急性期假体周围感染的新方法。目的:观察采用保留假体清创联合更换组配式部件治疗人工全髋关节置换后急性期假体周围感染的临床疗效。方法:选择2018年7月至2022年2月在黄石市中心医院骨科进行手术治疗的22例初次全髋置换后急性期假体周围感染患者,所有患者感染时间均为初次置换3周以内,术中取关节液及感染滑膜行细菌培养均证实为急性期感染,采用保留假体清创联合更换组配式组件治疗。术前、术后3,6个月以及末次随访,以白细胞计数、血沉、C-反应蛋白评价感染情况,以Harris髋关节功能评分量表评价髋关节功能改善情况,以疼痛目测类比评分了解患者疼痛缓解情况,采用配对样本t检验分析手术前后各指标改善情况。结果与结论:(1)非假体周围感染原因死亡1例后失访,予以排除,其余21例患者均获得临床随访,随访时间均在1年以上,平均随访时间为(19.52±3.88)个月,其中20例患者手术治疗成功,1例失败,感染控制率为95%;(2)患者术后3,6个月以及末次随访的白细胞计数、血沉、C-反应蛋白水平均较术前下降(P<0.05),Harris髋关节功能评分均较术前提高(P<0.05),疼痛目测类比评分均较术前下降(P<0.05),差异均有显著性意义(P<0.05);(3)提示全髋关节置换后急性期假体周围感染患者选择保留假体清创联合更换组配式组件的治疗方法能有效控制髋关节感染,改善髋关节功能,缓解感染导致的髋部疼痛。

运动疗法激活臀肌改善青年男性膝前痛患者的下肢肌力

背景:目前发现膝前痛与下肢生物力学有关,但仍缺少臀肌训练对膝关节及下肢日常活动影响的研究。目的:探究臀肌激活运动疗法对青年男性膝前痛患者髋、膝关节肌群肌肉力量和疼痛的影响。方法:纳入25例男性青年膝前痛患者,随机分为2组,臀肌激活组12例和空白对照组13例。臀肌激活组进行40 min/次、3次/周、为期6周的臀肌激活运动;空白对照组不进行任何干预。入组和干预6周后评估患侧髋关节、膝关节在60(°)/s和180(°)/s下等速屈伸运动测试的相对峰力矩、总功、屈伸肌群比值、肌肉耐力值,爬楼运动测试中停止爬楼的楼层,以及目测类比评分。结果与结论:①等速屈伸运动测试:髋关节,干预后臀肌激活组在60(°)/s和180(°)/s的相对峰力矩较干预前显著提高29.74%和25.95%(P=0.022,P=0.024);空白对照组在180(°)/s时的肌耐力较干预前降低12.12%(P=0.000)。膝关节,干预后臀肌激活组在60(°)/s和180(°)/s的相对峰力矩较干预前显著提高18.69%和7.27%(P=0.006,P=0.033);空白对照组各指标干预前后无著性变化(P>0.05)。②爬楼运动测试:臀肌激活组爬楼运动停止时的楼层数较空白对照组高(6.41±6.1)层(P=0.024),干预后较干预前增高(P=0.016);空白对照组干预前后无显著改变(P>0.05)。③疼痛评估:干预后臀肌激活组目测类比评分显著低于空白对照组(P=0.036),干预后较干预前降低(P=0.000);空白对照组干预前后无显著性变化(P>0.05)。结果表明:6周臀肌激活运动疗法可改善下肢肌群的爆发力和耐力,减轻膝前痛程度,对于膝前痛患者有必要进行臀肌训练,以促进康复。

有限元法在儿童发育性髋关节发育不良及治疗中的作用

背景:发育性髋关节发育不良常易导致患儿肢体畸形,其诊疗的相关研究已逐渐明确;近来有限元法因其优势在发育性髋关节发育不良的相关研究中受到学者重视。目的:通过文献检索综述有限元法在儿童发育性髋关节发育不良及治疗中的研究进展,分析总结其优势与不足,并探讨未来进一步研究的方向及应用前景。方法:应用计算机在Pub Med、SCI、CBM和中国知网数据库中检索2014年1月至2023年11月发表的相关文献,以“developmental dysplasia(dislocation) of the hip,dysplasia of the hip,finite element analysis(method),pavlik harness,fixation in herringbone position,biomechanics,pelvic osteotomies,pemberton,salter,dega,periacetabular osteotomy,children”为英文检索词,以“发育性髋关节发育不良,发育性髋关节脱位,髋关节发育不良,儿童,有限元,Pavlik吊带,人字型固定,生物力学,骨盆截骨术,髋臼周围截骨术”为中文检索词,同时纳入少量远期文献,通过筛选最终纳入62篇文献进行分析。结果与结论:(1)儿童发育性髋关节发育不良髋关节力学环境异常,髋臼内部压力不均匀、应力增大并集中,关节接触面积减小,股骨颈局部应力集中;(2)在Pavlik吊带及人字型固定位患髋力学环境改善,集中的高应力区域消失,关节接触面积增加,但外展角度过大会导致髋臼及股骨头外侧应力增加;(3)骨盆截骨术治疗后髋关节及骶髂关节应力环境得到改善,3种截骨术没有单一的铰链,其应力负载部位因患儿年龄而存在差异;(4)髋臼周围截骨术治疗后关节接触压力接近正常,而非球形股骨头者恢复困难;(5)术后X射线片表现不能说明关节接触力学达到最佳;(6)提示利用有限元法可以获得体内无法测量的信息,其在虚拟环境中操作不受时间和伦理的限制;能直观地看到正常与发育性髋关节发育不良患者髋关节应力变化的区域,从力学角度说明治疗的有效性,为需要截骨手术治疗的患者建立特定的有限元模型、量身定做手术计划;发育性髋关节发育不良的有限元建模及儿童髋关节材料特性参数尚无规范、统一的标准,由于有限元固有的局限性,目前还不能分析同时包含骨骼、软骨、韧带、肌肉等元素的模型;有限元分析操作难度较大,虽有优势但不具普适性,且目前的研究样本量较少,还需进一步扩大及验证。

声发射技术在关节外科中的应用及价值

背景:声发射技术是无损检测中最可靠和完善的技术之一,被广泛用于机械、土木和水下声学等多个领域的损伤检测。近年来,声发射技术获得较大发展,在医学工程领域得到初步应用,特别是在人体关节的摩擦评估以及植入物监测方面具有优势。目的:总结声发射技术在关节外科中的应用现状、存在问题及未来的发展方向。方法:检索1989年1月至2024年3月PubMed数据库、Web of Science数据库、中国知网、万方数据库发表的相关文献,中文检索词为“声学,髋关节置换术,髋关节假体,假体失效,膝关节骨关节炎,膝关节,监测,人工关节”;英文检索词为“acoustics,hip replacement arthroplasties,hip prosthesis,prosthesis failure,knee osteoarthritides,knee joint,monitoring,artificial joint”。初检得到文章2991篇,根据纳排标准,最终纳入80篇文章进行综述分析。结果与结论:①在关节外科领域中,声发射技术主要用于关节疾病早期的发现与诊断,以及关节置换术中骨裂和术后假体下沉、植入物磨损、无菌性松动、骨裂等的检测;②声发射技术的优势可以弥补传统检测方法的不足,提早发现关节炎,降低术中的损伤风险,监测并减少术后并发症,提高手术安全性和临床效果。

关节翻修领域热点问题:感染、康复护理、骨缺损及假体松动

背景:随着国内人口老龄化进展,关节置换手术的数量不断增长,与之对应的是关节翻修手术的数量也随之增加。定性、定量分析关节翻修领域的研究现状、研究热点和研究前沿具有重要意义。目的:通过文献计量学方法对近20年来关节翻修领域相关文献进行可视化分析,探索该领域的研究热点与动态趋势,以期为进一步研究提供参考。方法:计算机检索中国知识资源总库(CNKI)、中文科技期刊数据库(VIP)、中国学术期刊数据库(万方数据)2003-01-01/2022-12-31收录的关节翻修的相关文献,使用Note Express(3.9.0.9588)软件剔除重复数据,并采用CiteSpace(6.2.R6)、VOS viewer(1.6.20)和Excel(2016)软件对发文量、作者及机构合作网络、关键词共现、突现及聚类绘制科学知识图谱。结果与结论:①共纳入文献1806篇,近20年该领域年发文量总体态势趋于稳定;②对合作网络分析可知,发文量最多和中介中心性最高的作者是周一新,发文量最多的机构是周一新任职的北京积水潭医院,而中介中心性最高的机构是中国人民解放军总医院;③对关键词分析可知,关节翻修领域的研究热点主要集中在髋关节、感染、康复护理、骨缺损和假体松动等方面;④对关节翻修领域的文献进行可视化分析有利于理清研究脉络,为研究学者们提供研究思路及方法,并揭示该领域的研究态势和前沿热点。

Anterior muscle sparing approach for total hip arthroplasty

The purpose of this review is to examine the validity of positive claims regarding the direct anterior approach(DAA) with a fracture table for total hip arthroplasty. Recent literature regarding the DAA was searched and specific claims investigated including improved early outcomes, speed of recovery, component placement, dislocation rates, and complication rates. Recent literature is positive regarding the effects of total hip arthroplasty with the anterior approach. While the data is not definitive at present, patients receiving the anterior approach for total hip arthroplasty tend to recover more quickly and have improved early outcomes. Component placement with the anterior approach is more often in the "safe zone" than with other approaches. Dislocation rates tend to be less than 1% with the anterior approach. Complication rates vary widely in the published literature. A possible explanation is that the varianceis due to surgeon and institutional experience with the anterior approach procedure. Concerns remain regarding the "learning curve" for both surgeons and institutions. In conclusion, it is not a matter of should this approach be used, but how should it be implemented.

Longitudinal evaluation of time related femoral neck narrowing after metal-on-metal hip resurfacing

AIM: To track the short-term neck narrowing changes in Birmingham metal-on-metal hip resurfacing(MOMHR) patients. METHODS: Since 2001, the Center for Hip and Knee Replacement started a registry to prospectively collect data on hip and knee replacement patients. From June 2006 to October 2008, 139 MOMHR were performed at our center by two participate surgeons using Birmingham MOMHR prosthesis(Smith Nephew, United States). It is standard of care for patients to obtain low, anteriorposterior(LAP) pelvis radiographs immediately after MOMHR procedure and then at 3 mo, 1 year and 2 year follow up office visits. Inclusion criteria for the present study included patients who came back for follow up office visit at above mentioned time points and got LAP radiographs. Exclusion criteria include patients who missed more than two follow up time points and those with poor-quality X-rays. Two orthopaedic residency trained research fellows reviewed the X-rays independently at 4 time points, i.e., immediate after surgery, 3 mo, 1 year and 2 year. Neck-to-prosthesis ratio(NPR) was used as main outcome measure. Twenty cases were used as subjects to identify the reliability between two observers. An intraclass correlation coefficient at 0.8 was considered as satisfied. A paired t-test was used to evaluate the significant difference between different time points with P < 0.05 considered to be statistically significant.RESULTS: The mean NPRs were 0.852 ± 0.056, 0.839 ± 0.052, 0.835 ± 0.051, 0.83 ± 0.04 immediately, 3 mo, 1 year and 2 years post-operatively respectively. At 3 mo, NPR was significantly different from immediate postoperative X-ray(P < 0.001). There was no difference between 3 mo and 1 year(P = 0.14) and 2 years(P = 0.53). Femoral neck narrowing(FNN) exceeding 10% of the diameter of the neck was observed in only 4 patients(5.6%) at two years follow up. None of these patients developed a femoral neck fracture(FNF). CONCLUSION: Femoral neck narrowing after MOMHR occurred as early as 3 mo postoperatively, and stabilized thereafter. Excessive FNN was not common in patients within the first two years of surgery and was not correlated with risk of FNF.

Can periprosthetic hip joint infections be successfully managed by debridement and prosthesis retention?

To evaluate the current literature about how successfully periprosthetic hip joint infections can be managed by debridement and prosthesis retention.A literature search was performed through Pub Med until September 2013.Search terms were"DAIR(debridement,antibiotics,irrigation,and retention)"alone and in combination with"hip"as well as"hip infection+prosthesis retention".A total of 11 studies reporting on 292 cases could be identified.Five different treatment modalities have been described with varying success rates(debridement-21%infection eradication rate;debridement+lavage-75%infection eradication rate;debridement,lavage,with change of modular prosthesis components-70.4%infection eradication rate;debridement,lavage,change of modular prosthesis components+vacuum-assisted closure-92.8%infection eradication rate;acetabular cup removal+spacer head onto retained stem-89.6%infection eradication rate).With regard to the postoperative antibiotic therapy,no general consensus could be drawn from the available data.Debridement,antibiotic therapy,irrigation,and prosthesis retention is an acceptable solution in the management of early and acute hematogenous periprosthetic hip joint infections.The current literature does not allow for generalization of conclusions with regard to thebest treatment modality.A large,multi-center study is required for identification of the optimal treatment of these infections.

Hip joint center localisation: A biomechanical application to hip arthroplasty population

AIM: To determine hip joint center(HJC) location on hip arthroplasty population comparing predictive and functional approaches with radiographic measurements.METHODS: The distance between the HJC and the mid-pelvis was calculated and compared between the three approaches. The localisation error between the predictive and functional approach was compared using the radiographic measurements as the reference. The operated leg was compared to the non-operated leg.RESULTS: A significant difference was found for the distance between the HJC and the mid-pelvis when comparing the predictive and functional method. The functional method leads to fewer errors. A statistical difference was found for the localization error between the predictive and functional method. The functional method is twice more precise.CONCLUSION: Although being more individualized, the functional method improves HJC localization and should be used in three-dimensional gait analysis.

Survival outcomes of cemented compared to uncemented stems in primary total hip replacement

Total hip replacement(THR) is a successful and reliable operation for both relieving pain and improving function in patients who are disabled with end stage arthritis.The ageing population is predicted to significantly increase the requirement for THR in patients who have a higher functional demand than those of the past. Uncemented THR was introduced to improve the long term results and in particular the results in younger, higher functioning patients. There has been controversy about the value of uncemented compared to cemented THR although there has been a world-wide trend towards uncemented fixation. Uncemented acetabular fixation has gained wide acceptance, as seen in the increasing number of hybrid THR in joint registries, but there remains debate about the best mode of femoral fixation.In this article we review the history and current worldwide registry data, with an in-depth analysis of the New Zealand Joint Registry, to determine the results of uncemented femoral fixation in an attempt to provide an evidence-based answer as to the value of this form of fixation.

A Biomimetic Hip Joint Simulator and its Application in in vitro Study of the Integrity of Replacement Cemented Hip

A biomimetic hip joint simulator that can be used to evaluate the outcome of the cemented total hip replacement has been designed, manufactured and evaluated. The simulator produces motion in the extension/flexion plane, with a socket to rotate internal/externally. At the same time a dynamic loading cycle is applied. A validation test was performed on a cemented femoral stem within a novel composite femur. The hone quality has a strong effect on the stem migration and on the integrity of the interfaces. The migration of the stem is a combination of 3-D translation and rotation of the stem. Under the same loading conditions, weak bone allows more stem migration than strong bone. There is a great decrease in the strength of the stem-cement interface after the dynamic test, and the weak bone composite exhibited a greater reduction in interfacial strength than the strong bone composite. The decrease of the interfacial strength indicates that the primary bonding between the stem and the cement mantle had deteriorated and the integrity of stem-cement interface was damaged. The study demonstrates the value of using a hip joint simulator to investigate stem migration and interface integrity within the cemented hip replacement, suggesting that method can be used for in vitro evaluation of the biomaterials used in the cemented hip replacements.

Dynamic knee valgus kinematics and their relationship to pain in women with patellofemoral pain compared to women with chronic hip joint pain

Background:Dynamic knee valgus(DKV)is an abnormal movement pattern visually characterized by excessive medial movement of the lower extremity during weight bearing.Differences in hip and knee kinematic components of DKV may explain the emergence of different pain problems in people who exhibit the same observed movement impairment.Using a secondary analysis of exiting data sets,we sought to determine whether hip and knee frontal and transverse plane angles during a functional task differed between women with patellofemoral pain and women with chronic hip joint pain and the relationship between joint-specific kinematics and pain in these 2 pain populations.Methods:In the original studies,3-dimensional hip and knee kinematics during a single-limb squat were obtained in 20 women with patellofemoral pain and 14 women with chronic hip joint pain who demonstrated visually classified DKV.Pain intensity during the squat was assessed in both groups.For the secondary analysis,kinematic data were compared between pain groups using their respective control groups as a reference.Within each pain group,correlation coefficients were used to determine the relationship between kinematics and pain during the squat.Results:Hip adduction and contralateral pelvic drop were greater in those with chronic hip joint pain compared to those with patellofemoral pain(effect sizes ≥0.40).Greater knee external rotation(r= 0.47,p= 0.04)was correlated with greater knee pain in those with patellofemoral pain,while greater hip adduction(r = 0.53,p = 0.05)and greater hip internal rotation(r = 0.55,p = 0.04)were correlated with greater hip pain in those with chronic hip joint pain.Conclusion:Hip frontal plane motion was greater in those with chronic hip joint pain compared to those with patellofemoral pain.In both groups,greater abnormal movement at the respective joint(e.g.,knee external rotation in the patellofemoral pain group and hip adduction and internal rotation in the chronic hip joint pain group)was associated with greater pain at that joint during a single-limb squat.

One-stage total hip arthroplasty for advanced hip tuberculosis combined with developmental dysplasia of the hip:A case report

BACKGROUND A patient with advanced tuberculosis of the hip joint combined with Crowe type IV developmental dysplasia of the hip(DDH)and a drainage sinus is a rare condition.There are no previous reports of this condition,and it is a complex challenge for surgeons to develop a treatment scheme.CASE SUMMARY We report a 73-year-old male patient with severe hip pain and drainage sinus of the left hip for one month.Approximately 40 years ago,a drainage sinus occurred at the lateral left hip was healed at the local hospital with anti-infectious therapy.After the sinus healed,gradual pain occurred in the left hip for 40 years.Approximately one month prior,hip pain was sharply aggravated,and a drainage sinus reoccurred in the left hip.The X-ray and computed tomography examinations showed destruction of the head and neck of the left femur,as well as an acetabular deformity.The results of Mycobacterium tuberculosis antibody and Xpert were positive.Therefore,the patient was diagnosed with advanced TH combined with Crowe type IV DDH.After 22 d of treatment with anti-tuberculosis chemotherapy,the sinus healed,and the patient underwent one-stage total hip arthroplasty(THA)surgery consisting of debridement,osteotomy,and joint replacement.After surgery,the patient received anti-tuberculosis chemotherapy drugs for nine months,with no recurrent infection.After one year of follow-up,the Harris score of the patient increased from 21 pre-THA to 86.CONCLUSION Although drainage sinuses are a contraindication to one-stage THA,one-stage THA is still an effective and safe surgical method after the sinus heals.

Chromium Content in the Human Hip Joint Tissues

Objective Chromium has many important functions in the human body. For the osseous tissue, its role has not been clearly defined. This study was aimed at determining chromium content in hip joint tissues. Methods A total of 91 hip joint samples were taken in this study, including 66 from females and 25 from males. The sample tissues were separated according to their anatomical parts. The chromium content was determined by the AAS method. The statistical analysis was performed with U Mann-Whitney＇s non-parametric test, P〈0.05. Results The overall chromium content in tissues of the hip joint in the study subjects was as follows： 5.73 μg/g in the articular cartilage, 5.33 μ/g in the cortical bone, 27.86 μ/g in the cancellous bone, 5.95 μg/8 in the fragment of the cancellous bone from the intertrochanteric region, and 2.28 μ/g in the joint capsule. The chromium contents were observed in 2 group patients, it was 7.04 μ/g in people with osteoarthritis and 22.59 μ/g in people with fractures. Conclusion The observed chromium content was highest in the cancellous bone and the lowest in the joint capsule. Chromium content was significantly different between the people with hip joint osteoarthritis and the people with femoral neck fractures.

Two-stage revision arthroplasty for coagulase-negative staphylococcal periprosthetic joint infection of the hip and knee

BACKGROUND Periprosthetic joint infections(PJIs)are frequently caused by coagulase-negative Staphylococci(CoNS),which is known to be a hard-to-treat microorganism.Antibiotic resistance among causative pathogens of PJI is increasing.Two-stage revision is the favoured treatment for chronic CoNS infection of a hip or knee prosthesis.We hypothesised that the infection eradication rate of our treatment protocol for two-stage revision surgery for CoNS PJI of the hip and knee would be comparable to eradication rates described in the literature.AIM To evaluate the infection eradication rate of two-stage revision arthroplasty for PJI caused by CoNS.METHODS All patients treated with two-stage revision of a hip or knee prosthesis were retrospectively included.Patients with CoNS infection were included in the study,including polymicrobial cases.Primary outcome was infection eradication at final follow-up.RESULTS Forty-four patients were included in the study.Twenty-nine patients were treated for PJI of the hip and fifteen for PJI of the knee.At final follow-up after a mean of 37 mo,recurrent or persistent infection was present in eleven patients.CONCLUSION PJI with CoNS can be a difficult to treat infection due to increasing antibiotic resistance.Infection eradication rate of 70%-80%may be achieved.

Management of failed metal-on-metal total hip arthroplasty

The theoretical advantages of metal-on-metal(MOM)bearing couples in total hip arthroplasty(THA) have been recently balanced by concerns regarding adverse local and systemic effects. Higher than anticipated early revision rates have been reported by several joint registries. Failed MOM hips present with a spectrum of symptoms and findings and traditional methods of failure must be considered in addition to the failure modes that appear to be unique to the MOM bearing couple. Metal hypersensitivity and soft tissue immune reactions remain incompletely understood and require careful ongoing study. The tools available to evaluate MOM THAs and the indications for revision surgery remain to be defined. Outcomes following revision of MOM hips appear to depend on appropriate evaluation, early identification, and appropriate surgical management.

Developing an enhanced recovery after surgery program for oncology patients who undergo hip or knee reconstruction surgery

Enhanced recovery after surgery(ERAS)protocols are applied in orthopedic surgery and are intended to reduce perioperative stress by implementing combined evidence-based practices with the cooperation of various health professionals as an interdisciplinary team.ERAS pathways include pre-operative patient counselling,regional anesthesia and analgesia techniques,post-operative pain management,early mobilization and early feeding.Studies have shown improvement in the recovery of patients who followed an ERAS program after hip or knee arthroplasty,compared with those who followed a traditional care approach.ERAS protocols reduce post-operative stress,contribute to rapid recovery,shorten length of stay(LOS)without increasing the complications or readmissions,improve patient satisfaction and decrease the hospital costs.We suggest that the ERAS pathway could reduce the LOS in hospital for patients undergoing total hip replacement or total knee replacement.These programs require good organization and handling by the multidisciplinary team.ERAS programs increase patient's satisfaction due to their active participation which they experience as personalized treatment.The aim of the study was to develop an ERAS protocol for oncology patients who undergo bone reconstruction surgeries using massive endoprosthesis,with a view to improving the surgical outcomes.