Cases reported "prosthesis failure"

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1/1032. Failure of the hinge mechanism of a trispherical total wrist arthroplasty: a case report and review of the literature.

    We report a patient with rheumatoid arthritis who developed late catastrophic failure of the hinge mechanism of her trispherical total wrist arthroplasty. This was associated with synovitis secondary to wear debris from titanium, cement, and polyethylene which produced exuberant flexor and extensor tendon synovitis and median nerve compression. ( info)

2/1032. A rotating-hinge knee replacement for malignant tumors of the femur and tibia.

    We evaluated the 2- to 7-year results of a rotating-hinge knee replacement after excision of malignant tumors of the knee joint. There were 25 distal femoral and 7 proximal tibial replacements. The 5-year prosthetic survival for distal femoral replacements was 88%, compared with 58% for proximal tibial replacements. Seven patients underwent prosthetic exchange: 1 for aseptic loosening, 2 for wound slough and perioperative infection, and 4 for articulating component failure. One patient underwent above-knee amputation owing to skin necrosis. The median functional scores at the latest follow-up were 27 by the International Society of limb salvage evaluation system and 80 by the Hospital for Special Surgery Knee Score system. This implant is a promising choice for joint reconstruction after excision of tumors at the knee joint. ( info)

3/1032. thrombosis of mitral valve prosthesis presenting as abdominal pain.

    A 67-year-old woman presented with abdominal pain, anemia, and leukocytosis. Five years previously, the patient had undergone mitral valve replacement with a St. Jude bileaflet mechanical prosthesis. After her admission, echocardiography confirmed an immobile leaflet of the prosthetic valve. At urgent surgery, thrombosis and pannus, obstructing the disc, were found, and the mechanical valve was replaced with a bioprosthesis. The incidence of mitral valve thrombosis is low, ranging from 0.1% to 5.7% per patient per year. patients who receive inadequate anticoagulation, particularly with valve prostheses in the mitral position, have an increased risk for thrombus or pannus formation. Presentation varies, from symptoms of congestive heart failure or systemic embolization, to fever or no symptoms. New or worsening symptoms in a patient with a prosthetic heart valve should raise concerns about prosthetic dysfunction. Aggressive investigation and, if indicated, urgent or emergency surgery for treatment can be lifesaving. ( info)

4/1032. Revision hip arthroplasty in patients with a history of previous malignancy.

    BACKGROUND AND OBJECTIVES: The potential association between implants and malignancy has been discussed in the literature, but never as a cause of loosening of joint arthroplasty. methods: The records of all patients who underwent revision arthroplasty at our institution between 1992 and 1995 were reviewed. RESULTS: Among 93 patients who underwent revision hip arthroplasties, 11 (11.8%) had a history of previous malignancy. At surgery, in 2 of these patients, metastasis was found to be the cause of loosening in the affected hip. CONCLUSIONS: When revision hip arthroplasty is considered, patients with a history of malignancy require attenuated pre-, intra-, and postoperative workup. Management algorithm in such cases is proposed. ( info)

5/1032. Severe migratory granulomatous reactions to silicone gel in 3 patients.

    In humans implanted with silicone gel breast prostheses, a mild foreign body response results in the formation of a collagenous capsule around the prosthesis. Although many such patients may show evidence of a microscopic granulomatous foreign body reaction upon examination of capsular material at explantation of a prosthesis, it is unusual to have large, palpable granulomas, even in the presence of rupture or leakage. Rare patients have had severe local inflammation and complications resulting from silicone migration to the axilla, arm, or abdominal wall. We describe 3 patients who had deforming granulomas after implant rupture, along with other consequences of silicone gel migrating down the upper extremity. Silicone gel, once it leaves the implant, is not biologically inert and in some persons can elicit profound pathologic responses. ( info)

6/1032. Expeditious diagnosis of primary prosthetic valve failure.

    Primary prosthetic valve failure is a catastrophic complication of prosthetic valves. Expeditious diagnosis of this complication is crucial because survival time is minutes to hours after valvular dysfunction. The only life-saving therapy for primary prosthetic valve failure is immediate surgical intervention for valve replacement. Because primary prosthetic valve failure rarely occurs, most physicians do not have experience with such patients and appropriate diagnosis and management may be delayed. A case is presented of a patient with primary prosthetic valve failure. This case illustrates how rapidly such a patient can deteriorate. This report discusses how recognition of key findings on history, physical examination, and plain chest radiography can lead to a rapid diagnosis. ( info)

7/1032. Intra- and extraoral prostheses using osseointegrated implants after maxillofacial surgery.

    Maxillary and orbital defects due to the resection of maxillary tumors in six cases were treated utilizing maxillofacial prostheses employing pure titanium osseointegrated implants (Branemark system). A total of 17 fixtures were installed in the maxillary region, and 16 achieved osseointegration. For the orbital region, nine fixtures were installed, and all fixtures integrated well. Using these fixtures as anchors, four maxillary prostheses and three orbital prostheses were set. The stability of the prostheses were improved by anchors, and the prostheses were highly satisfactory to the patients. ( info)

8/1032. Rapid tibial polyethylene failure in porous-coated anatomic total knees as a cause of clinical failure.

    Among 52 patients with porous-coated anatomic total knee arthroplasties, three (6%) underwent revision surgery because of failure of the tibial polyethylene at two years and three months, four years and three months, and four years and nine months after surgery. Thinning of the tibial polyethylene may have contributed to the failure in one patient. Heat pressing fabrication and the articular geometry possibly played a role in the development of failure in all three patients. Surgical latitude of the prosthetic design was considered to be too narrow to be applied to knee joints with severe deformity, for which knee prostheses with more intrinsic stability might be appropriate. ( info)

9/1032. mitral valve prosthesis disk embolization during transeptal atrioventricular junction ablation.

    We report a case of disk embolization from a Bjork-Shiley mitral valve prosthesis (Shiley Inc., Irvine, CA, USA) which occurred during transeptal atrioventricular (RV) junction ablation. The disk lodged in the lower thoracic aorta. The patient was treated successfully by emergency valve replacement, and the escaped disk has been left in situ with no complications. ( info)

10/1032. Difficulty in removal of the distal locking device of the Brooker-wills tibial nail.

    Complications in removal of the Brooker-wills tibial nail were encountered in eight patients, and breakage of the distal fins occurred in four of these patients. Although none of the patients experienced residual effects related to removal of the tibial nail, the procedure is associated with potential risks such as infection or nonunion. Three methods of nail removal are described. ( info)
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