Revision total hip arthroplasty for pelvic osteolysis with well-fixed cementless cup

Treatment of pelvic osteolysis after total hip arthroplasty (THA) remains controversial. Clinical and radiographic outcomes of revision THA were evaluated in 62 hips with pelvic osteolysis and well-fixed cementless cups. The patients' mean age was 50.9 years, and the mean interval from primary to revision THA was 9.7 years. For revision, cementless cups were used in 51 hips, and cemented cups in 11 with acetabular reinforcement rings in 9. The mean duration of follow-up after revision THA was 5.9 years (range, 3.0-9.7 years). At final follow-up, the average Harris Hip Score was 92.4, and there was no radiographic complication except for 1 with change of inclination. Revision THA for pelvic osteolysis with well-fixed cementless cups showed favorable outcomes, and it can be preferentially used in young patients.     

Revision total hip arthroplasty

Two hundred and ten hips in 206 patients who had an initial total hip arthroplasty performed at the Mayo Clinic between 1969 and 1978 required revision of the arthroplasty at the Mayo Clinic for reasons other than infection. One hundred and sixty-two of the patients (166 hips) were followed both clinically and roentgenographically for two years or more. One hundred and forty-five (90 per cent) reported that they had improvement after the surgical revision. Complications that occurred with revision included deep sepsis, superficial would infection, dislocation, intraoperative femoral fracture, and postoperative femoral fracture. Roentgenographic analysis showed probable loosening in thirty-three acetabular components (20.1 per cent) and seventy-two femoral components (44 per cent). Symptomatic loosening (moderate to severe pain and probable roentgenographic loosening) was seen in thirty-five patients. Eight patients required a second revision for this reason, and seven others required a second revision for other reasons. Modified Harris hip scores, calculated for 108 hips, showed a good or excellent result in sixty-seven hips (62 per cent), a fair result in twelve (11 per cent), and a poor result in twenty-nine (27 per cent). Using a new Mayo Clinic hip score that incorporates roentgenographic data (which will be described) in the evaluation of 165 revised hips, there was a good or excellent result in eighty-five (52 per cent), a fair result in thirty-two (19 per cent), and a poor result in forty-eight hips (29 per cent). Although 90 per cent of the patients thought that their condition had improved, the high incidence of roentgenographic signs of probable loosening of a component is of serious concern.     

髋关节置换术后感染的手术治疗

目的探讨髋关节置换术后感染手术治疗的临床疗效。方法共11例髋关节置换术后感染患者,男6例,女5例,平均63岁(54～71岁)。术前Harris评分25～40分,平均33分。术前血沉均有升高,平均61mm/h(34～80mm/h)。所有患者术前、术中均进行细菌培养和药敏试验。11例中一期翻修6例,二期翻修5例,术后均置引流管引流并根据药敏试验应用抗生素。11例患者早期感染2例,晚期感染9例。术前穿刺及窦道脓液培养阳性8例,其中5例为表皮葡萄球菌,2例为大肠埃希氏菌,1例为金黄色葡萄球菌。结果术后11例患者随访12～31个月,平均17个月,感染均未复发,血沉、血常规检查正常,术后Harris评分为79～92分,平均84.2分,较术前平均提高51.2分(P<0.05)。结论髋关节置换术后感染,只要诊断明确,合理使用抗生素和抗生素骨水泥,一期翻修同样可以取得满意的临床疗效。     

全髋关节置换翻修术

全髋关节翻修术目前已成为临床髋关节外科领域中最重要研究课题之一,不仅仅因为需要施行关节翻修的患者数量逐年增加,而且更重要的髋关节翻修手术的基础理论研究和临床实践都面临巨大挑战.     

Revision total hip arthroplasty for metal-on-metal failure

Metal-on-metal (MoM) arthroplasty systems became popular in the early-2000s due to presumed advantages of improved wear characteristics and superior stability. However, subsequent reports of abnormal soft-tissue reactions to MoM implants and national registry data reporting high failure rates raised concerns. Early outcomes of revision total hip arthroplasty (THA) for adverse reaction to metal debris (ARMD) were poor, leading to development of surveillance programs and a trend towards early revision surgery. Patients with MoM arthroplasties require surveillance, comprehensive history and physical examination, imaging with ultrasound or magnetic resonance imaging (MRI), and laboratory evaluation including metal ion levels. Operative strategies for revision THA vary from exchange of modular components to extensive debridement and reconstruction with revision components. Surgeons should be aware of the increased risks of dislocation and infection following revision THA for ARMD. However, there is growing evidence that early revision surgery prior to extensive soft tissue destruction results in improved outcomes and decreased re-operation rates. It is estimated that >1 million MoM articulations have been implanted, with a large proportion still in situ. It is imperative to understand the aetiology, presentation, and management strategies for these patients to optimise their clinical outcomes.     

Reconstruction of major column defects and pelvic discontinuity in revision total hip arthroplasty

Acetabular reconstruction with severe bone loss after failed total hip arthroplasty is a difficult problem. Defects were defined as major segmental and cavitary loss (type III anterior or posterior) or pelvic discontinuity (type IV). Seventeen cases were treated, of which 7 were type III and 10 were type IV. Bulk allograft was used in 16 of 17 cases, of which 7 were whole acetabular grafts, 2 were posterior segmental acetabular grafts, and 7 were femoral heads. Fourteen of 17 patients were female. The extensile triradiate approach was used in 12 cases. Long pelvic bone plates were applied to the posterior column and anterior brim of the pelvis in most cases. Allografts united to host-bone in 15 cases. Average follow-up was 83 months. The overall revision rate was 47%, of which 3 of 7 press-fit and 2 of 10 cemented cups had failed. The dislocation rate for the extensile approach was 50%; 2 patients had excisional arthroplasty for infection, and 2 patients had exploration of the sciatic nerve for release from migrating pelvic plate screws. Because of the overall poor results, this approach cannot be recommended for general use.     

Pelvic discontinuity in revision total hip arthroplasty

BACKGROUND: Pelvic discontinuity is a distinct form of bone loss, occurring in association with total hip arthroplasty, in which the superior aspect of the pelvis is separated from the inferior aspect because of bone loss or a fracture through the acetabulum. The purpose of this study was to describe the population of patients who are at risk for this condition, to identify the characteristic radiographic features associated with it, and to report the results of revision total hip arthroplasty for the treatment of pelvic discontinuity. METHODS: The cases of all twenty-seven patients (thirty-one hips) who were identified as having a pelvic discontinuity at the time of a reoperation for a failed hip arthroplasty at one institution were reviewed retrospectively, and demographic information was collected. The preoperative radiographs and the operative notes were reviewed, and the postoperative results and complications were recorded. RESULTS: Pelvic discontinuity was identified in association with thirty-one (0.9 percent) of 3505 acetabular revisions. The mean age of the patients was sixty-one years (range, thirty-eight to eighty years). Twenty-eight hips were in women, and three were in men. Women (p < 0.001) and patients who had rheumatoid arthritis (p = 0.003) had a significantly increased risk of pelvic discontinuity. The radiographic findings included a visible fracture line through the anterior and posterior columns, medial translation of the inferior aspect of the hemipelvis relative to the superior aspect (seen as a break in Kohler's line), and rotation of the inferior aspect of the hemipelvis relative to the superior aspect (seen as asymmetry of the obturator rings) on a true anteroposterior radiograph. Two patients died within two years after the revision, and two had a resection arthroplasty for the treatment of the pelvic discontinuity; thus, twenty-seven hips were reconstructed and were eligible for follow-up at least two years after the operation. A number of different methods were used for reconstruction, but the results were best in patients who did not have severe segmental acetabular bone loss (type IVa [a satisfactory result in three of three hips]) and poorer in those who had severe segmental or combined segmental and cavitary bone loss (type IVb [a satisfactory result in ten of nineteen hips]) and in those who previously had been treated with irradiation to the pelvis (type IVc [a satisfactory result in three of five hips]). Nine of the twenty-seven hips needed another operation: four, because of aseptic loosening of the acetabular component; four, because of recurrent dislocation; and one, because of deep infection. Excluding three hips that were revised early because of infection or dislocation, a mechanically stable construct (that is, a stable socket and a possibly or definitely healed discontinuity) was obtained in seventeen of twenty-four hips. CONCLUSIONS: Pelvic discontinuity is uncommon, and treatment is associated with a high rate of complications. For hips with type-IVa bone loss and selected hips with type-IVb defects, in which a socket inserted without cement can be satisfactorily supported by native bone, we prefer to use a posterior column plate to stabilize the pelvis and a porous-coated socket inserted without cement. For most hips with type-IVb and type-IVc bone loss, we prefer to use particulate bone graft or a single structural bone graft protected with an antiprotrusion cage.     

Revision of infected total hip arthroplasty

Extension of infection down the medulla of the femur to the supracondylar region may occur in cases of chronic infected total hip arthroplasty. Because this cannot always be identified before operation, the femur should be reamed and flushed proximally from the lateral condyle in all cases where there is suspicion of infection around the femoral component. Where infection is unequivocal and extensive, a period of irrigation and suction drainage is advisable before final total hip arthroplasty. After the prosthesis has been inserted in either one or two stages, it is wise not to rely on antibiotic cement mixtures alone but to monitor the bacterial flora and prescribe local antibiotic therapy accordingly.     

Revision of failed total hip arthroplasty

Ninety-seven revisions of total hip replacements are reviewed with a median time of observation of 47 months. Satisfactory pain relief was obtained in 86%. There were six complete failures which were reduced to three by further surgery. One hip became infected and was excised. In 12 cases the revisions were complicated by peroperative fractures and in five by dislocations. Radiographic analysis disclosed a high percentage of periarticular ossification and 25 cases of radiographic loosening of the femoral implant.     

人工股骨头置换术后全髋关节翻修术的临床研究

目的探讨人工股骨头置换术后全髋关节翻修术的手术指征和技巧。方法回顾性分析1997年6月至2000年6月行人工股骨头置换术后全髋关节翻修术的56例患者的临床资料。其中男性31例,女性25例;年龄64—75岁,平均68岁。翻修原因中,人工股骨头置换术后髋臼磨损29例（51．8％）,髋臼磨损及股骨头中心性脱位14例（25．0％）,股骨柄松动12例（21．4％）,股骨柄断裂1例（1．8％）。Harris评分术前平均37分（28～40分）。所有病例均一期翻修,有骨质缺损者同时植骨。结果49例患者术后获得平均7年（5—8年）随访,7例失访。末次随访Harris评分平均88分（84～90分）。全部病例术后无伤口感染和神经血管损伤。5例患者出现并发症,其中扩髓时骨皮质不全骨折1例,术后下肢深静脉血栓3例,髋关节脱位1例。随访患者中无髋臼及股骨柄假体需要再度翻修。X线片显示人工关节假体位置正常,无松动感染征象。结论髋臼磨损及股骨头中心性脱位是人工股骨头置换术后全髋关节翻修的主要原因。中期临床随访结果显示,若手术指征正确,手术技巧娴熟,该翻修手术可以获得良好的临床效果。     

Early postoperative acetabular discontinuity after total hip arthroplasty

Periprosthetic acetabular fracture is a rare complication after total hip arthroplasty (THA). However, we have treated 2 patients with acute postoperative acetabular discontinuity that occurred 2 and 3 weeks after primary THA. Both fractures were in elderly osteoporotic female patients with minimal trauma and may have developed from unrecognized intraoperative fractures. Pelvic stability was restored with acetabular revision using medial morselized bone grafting and a cemented reconstruction cage. This report demonstrates that early postoperative periprosthetic acetabular discontinuity after THA is a risk in elderly patients with severe osteoporosis and that salvage of acetabular fixation can be achieved with cemented cage reconstruction and medial morselized bone grafting.     

Revision total hip arthroplasty due to pain from hypersensitivity to cobalt-chromium in total hip arthroplasty

We report a case with hypersensitivity to CoCr in total hip arthroplasty coupled with conventional polyethylene and CoCr femoral head. The patient complained of left hip pain and systemic fever, and computed tomography imaging revealed a periprosthetic cystic lesion, so we performed revision total hip arthroplasty using a titanium stem and ceramic head and highly crosslinked polyethylene. Hip pain and cystic lesion disappeared 3 years after revision surgery.     

Intraoperative pelvic motion in total hip arthroplasty

In total hip arthroplasty (THA) in which the posterolateral approach is used, the pelvis can be easily inclined to roll both backward or forward on the operating table during the procedure. We prospectively studied 30 posterolateral-approach primary THA cases in which the surgeon used a specially devised goniometer that measured motions of the pelvis in the horizontal, frontal, and sagittal planes. We found that the pelvis primarily tilted forward during surgery, averaging 14.57 degrees of anterior tilt in the horizontal plane. The pelvic motion primarily occurred while the Hohman retractor was being applied to the femur to expose the acetabulum. Assessment of pelvic motion during surgery is an important component for successful positioning and placement of the acetabular cup with the posterolateral-approach THA.     

Revision total hip arthroplasty with cemented femoral component

We reviewed retrospectively the results of 28 hips (25 patients) after revision of the femoral component with use of a cemented stem, because of aseptic loosening. The mean duration of follow-up was 4.43 years (range 2–12 years). Over the course of the study period, repeat revision was done in 4 hips after an average of 4.45 years. Three hips had a repeat revision of the femoral component because of aseptic loosening and one for a deep infection. The rate of loosening of the femoral component was 32.4% (9 hips) at an average of 5.22 years. The 5-year survival rate was 76.9% with mechanical failure as end point; and 90% with re-revision of femoral component because of aseptic loosening as end point. The cement mantle was the principal factor, which was significantly associated with a better survival rate of femur fixation (P < 0.05). No correlation was noted between quality of bone loss at the time of revision, bone graft or the use of long stems, and the survival rate of femoral component. By improving the cementing technique and in selected patients, the use of cemented femoral stem could be a good alternative for aseptic loosening THA.     

Revision total hip arthroplasty using third-generation cementing technique

A total of 83 consecutive first-revision total hip arthroplasties were performed in 83 patients using pressurized vacuum-mixed cement, a third-generation cementing technique. At a median follow-up of 3.6 years (range, 1.5-6.3 years), the overall failure rates (radiographic loosening, re-revision, or both) were 39% for the femoral components and 30% for the acetabular components. With definite radiographic loosening as an endpoint, the cement-bone interface achieved was the only significant factor to predict stem durability, with an adjusted odds ratio of 1.8 (95% confidence interval, 1.1-3.0). On the acetabular side, bone stock was the only significant factor, with an adjusted odds ratio of 5.3 (95% confidence interval, 4.0-27.7). In this retrospective cohort study, femoral cement pressurization per se did not appear to improve the results over those of other studies using second-generation techniques.     

Revision total hip arthroplasty using a cementless modular femoral hip design

The difficulty in selecting the "ideal" components for revision total hip arthroplasty is one factor leading to poor outcomes. For femoral hip components, loosening rates of femoral revision have been reported with different types of designs. Because of improved rates with more porous components, the use of cementless femoral revision is highly attractive. This article describes a cementless femoral revision component, the ZMR system, which addresses the challenges and design goals of revision as well as surgical philosophy: off-the-shelf flexibility, proximal-distal extensive fixation, restoration of kinematics (offset, let lengths, anteversion, and muscle tensioning), and implant integrity.     

Changes in pelvic tilt following total hip arthroplasty

Background  

It is important to understand chronological changes in pelvic tilt after total hip arthroplasty (THA). In this study, we first investigated changes in pelvic tilt after THA. Second, we determined the correlation between preoperative pelvic tilt and the extent of postoperative changes in the pelvic tilt. Third, we evaluated the effects of changes in pelvic tilt on postoperative function and disability.