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Dislocation of polyethylene liner in uncemented Harris Galante II acetabulum: report of 6 cases.

We report the dislocation of 6 liners out of the metal backing shells of Harris Galante II cementless total hip prostheses implanted between 1993 and 1996. The time between primary implantation and failure varied from 46 to 95 months. The dislocations were probably the result of suboptimal mechanical fixation of the polyethylene liner in the shell compounded by suboptimal positioning of the acetabular component. In 5 cases, both the metal backing and the liner were revised because of broken tines. In one case, only the liner was exchanged.

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Perioperative morbidity and mortality after reconstruction for metastatic tumors of the proximal femur and acetabulum.

An observational cohort study was performed on 90 hip arthroplasties performed in 84 patients for metastatic disease of the hip. Significant improvement was noted with both 3-month and 6-month function scores vs preoperative function scores (P < .001). Complications included 1 intraoperative femur fracture, 2 cases of deep venous thrombosis, 1 peroneal nerve palsy, 1 deep infection, and 5 dislocations. Eight (8.8% of 90 procedures, 9.4% of 84 patients) patients died during the initial hospital stay. Although the risk of mortality after hip arthroplasty for metastatic diseases is perhaps higher than previously expected, improvement in postoperative function scores in surviving patients was significant and perioperative morbidity in this complex patient population was acceptably low.

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Minimally invasive ilioinguinal approach to the acetabulum.

The classic ilioinguinal approach is a gold standard in acetabular surgery. We developed a modification, a minimally invasive method that entails a median lower abdominal approach with extraperitoneal dissection and exposure of the pubic symphysis. The second incision is lateral, next to the iliac crest. This allows an easy, safe and quick exposure of the anterior iliac ring as well as easy access to the posterior column and wall towards the sacroiliac joint. The iliac vessels and nerves are thereby protected, and no preparation of neurovascular structures is required. The technique was applied in 23 clinical cases and compared with the classic ilioinguinal approach in 9 similar cases over the same period.

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Preliminary results and complications following limited open reduction and percutaneous screw fixation of displaced fractures of the acetabulum.

Twenty-four patients underwent attempted closed or limited open reduction of displaced acetabular fractures. If reduction was successful, the fractures were stabilized with percutaneous screws. Group 1 was composed of elderly patients with complex fractures and radiographic findings that were felt to be predictive of post-traumatic arthritis. In these patients, percutaneous screw fixation was used to improve fracture anatomy, allow mobilization and total hip replacement later, if necessary. In group 1, anatomical reduction was not felt to be a necessity. Group 2 was composed of young patients with simple fracture types. For group 2, anatomical reduction was the goal. In 23/24 patients, closed or limited open reduction was successful. In group 1, maximum displacement averaged 10 mm preoperatively, 3 mm postoperatively. In group 2, maximum displacement averaged 7 mm preoperatively, 1 mm postoperatively. One elderly patient was lost to follow-up and one died, leaving 21 patients with an average follow-up of 12 months. All the fractures healed. One patient had a transient femoral nerve palsy, and two elderly patients had minor losses of reduction due to unprotected ambulation after surgery. Five of the elderly patients have gone on to total hip arthroplasty. The average Harris Hip scores in groups 1 and 2 were 85 and 96, respectively.

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Surgical management of fractures of the acetabulum: the Sheffield experience 1976-1994.

Of 56 acetabular fractures treated in Sheffield between 1976 and 1994, 43 fractures in 40 patients underwent open reduction and internal fixation. This paper reviews the surgically managed fractures with emphasis on the quality of operative reduction and outcome, in particular the development of degenerative osteoarthritis leading to total hip replacement. A good clinical result following operative management was seen to correlate closely with a near perfect reduction; in contrast, all cases with a poor reduction underwent joint replacement in the follow-up period. The relatively few cases managed at a major referral centre in this series suggest that either the incidence of acetabular fracture is low in the area or that only a proportion of cases are referred from the surrounding district general hospitals.

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Periprosthetic fractures of the acetabulum.

Periprosthetic acetabular fractures during and after total hip replacement occur infrequently. Intraoperative fractures have risen with the use of press fit cementless fixation techniques and postoperative fractures are increasing because of the long-term problems associated with osteolysis. This article outlines the classification and management of these fractures.

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Acute periprosthetic fracture of the acetabulum associated with osteolytic pelvic lesions: a report of 3 cases.

Three cases of acute acetabular fracture around uncemented porous-coated acetabular components associated with osteolytic lesions of the pelvis are reported. In each case, the fracture occurred through an area of severe osteolysis that contributed to the structural failure of the pelvis. None of the fractures were associated with significant trauma, and none of the implants demonstrated evidence of loosening before the fracture. When marked pelvic osteolysis develops around the acetabular component of a total hip arthroplasty, the possibility of pelvic fracture must be considered. Total hip arthroplasty patients with osteolysis should be followed with radiographs at regular and frequent intervals. When osteolysis progresses, early intervention should be strongly considered because appropriate treatment may prevent fracture occurrence.

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Reconstruction of the deficient acetabulum with an oblong prosthesis: three- to seven-year results.

A retrospective review was conducted to determine the intermediate-term results of a noncustomized, oblong, porous-coated, cementless, acetabular component designed to obtain stability on host bone while maintaining an anatomic hip center. The clinical and radiographic results were reviewed in 18 patients (3 primary, 15 revision). All patients had substantial acetabular rim defects before reconstruction with the Johnson and Johnson E-15 or E-25 oblong components. The average follow-up was 4.5 years (range, 3.4-6.9 years), with an average postoperative Harris Hip Score of 91 points. Radiographic analysis revealed no prosthetic migration and near anatomic restoration of the hip center.

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[Fractures of acetabulum and pelvic ring--epidemiology and clinical outcome].

From 1980 to 1995 inclusive we conducted a study on pelvic ring and acetabular fractures in Kantonspital Chur (KSC). 118 patients were studied and of these 51 had pelvic ring fractures and 67 acetabular fractures. Most of the patients with pelvic ring fractures had additional severe injuries and almost two thirds of them were polytraumatised and very shocked. One third of the acetabular patients were polytraumatised and about one fifth shocked. The length of the hospital stay was also noteworthy--an average of 47 days for the pelvic ring fractures and 30 days for the acetabular fractures. These injuries mainly affected patients in the active working age group (20-60 years of age). 56 of these had acetabular fractures and 39 had pelvic ring fractures. From 51 patients (76%) treated with acetabular fractures and 45 with pelvic ring fractures (88%) (i.e. of total 96 (81%)) we have summarised our results. About two thirds of the patients were followed up at one year and the AO documentation form completed. The remainder were sent a questionnaire. The results showed that 84% of the acetabular fracture group and 83% of the pelvic ring fractures had a good or excellent final result. Radiological complications noted in the acetabular fracture group were early signs of degenerative disease (18), a slight pelvic tilt (8), heterotopic ossification (7), early evidence of femoral head necrosis (3) and 1 definite pseudoarthrosis. Additionally 7 patients had significant motor or sensory loss. By comparison, those with pelvic ring fractures showed less in the way of radiological complications. 17 patients were seen to have a slight tilt, 9 showed initial signs of arthrosis and there was 1 pseudoarthrosis. Of the 5 patients in this group with neurological damage, 3 had difficulty in achieving an erection and 2 had urological problems. One patient who had a pelvic ring fracture had to have a caesarean section for a subsequent pregnancy.

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Reconstruction of segmental defects during revision procedures of the acetabulum with the Burch-Schneider anti-protrusio cage.

Sixty-three Burch-Schneider rings in 62 patients with segmental or combined defects were followed up after a mean of 5.45 years. The mean Harris hip score was 74.9 points. Aseptic loosening occurred in 3 cases, and septic loosening occurred in 2 cases. All cases of aseptic loosening had Paprosky stage IIIb defects and defects of the posterior column. Radiologic migration analysis showed increased migration with increase in the Paprosky defect stage, defects of the posterior column, and cranial defects. The cage has the lowest migration and loosening rate in cases with medial defects or anterior column defects. Surgical treatment of defects of the posterior column is associated with an increased rate of aseptic loosening, whereas implantation with cranial defects shows a higher migration rate with no significant increase in loosening.

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The incidence of cement extrusion from the acetabulum in total hip arthroplasty.

Acetabular cement extrusion (CE) is a common finding after total hip arthroplasty, but the incidence is unclear from the literature, and there is no accepted way of measuring it. We report a retrospective observational study of 100 patients (25 consecutive patients from each of 4 consultants, 112 hips) to determine the site and incidence of CE on postoperative radiographs, and to measure its area and the maximum distance of the extruded cement from the edge of the cement mantle. We found that 50 of 112 (44.6%) hips showed evidence of CE, with a 15.2% incidence of CE > 200 mm(2).

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[Acetabulum fractures. Diagnosis, classification, evaluation].

Diagnostics of acetabular lesions rest on careful explored medical history, clinical findings and X-ray-examination. Apart from standard radiography (pelvis a. p., injured hip a. p., iliac-oblique and obturator-oblique), which enables classification and supports strategic therapy decisions, computed tomography is considered indispensable by the majority. Fragment interposition, marginal impaction and concomitant occult pelvic ring fractures are detected and are the basis for special tactical decisions in operative treatment. The classification of Letournel with 5 elementary and 5 associated fracture types is still widely used. The AO-classification gives a solid basis for scientific evaluation and is a fundamental for a therapeutic concept with its basic structure with types and groups, ascending according to damage severity. Evaluation of acetabular fractures has to include additional and concomitant lesions and expected late damages. Only an anatomic reconstruction of the weight bearing part of the socket gives a chance for functional restitution. Osteoarthritis and disabling ectopic ossifications are not always avoidable and are subsequently the cause of impairment and respectively loss of working ability.

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