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Results for “Joint Prosthesis”

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At least 991 records · Page 55Linked to original sources
PubMed1989

Surgical management of advanced hemophilic arthropathy. An overview of 20 years' experience.

Advanced hemophilic arthropathy often causes moderate to severe pain and significant incapacity by the third or fourth decade of life. Most of these patients can be managed conservatively with clotting factor replacement on demand, therapeutic exercises, antiinflammatory drugs, orthoses, and activity restriction. Some patients, however, have such severe pain and disability and frequent need for clotting factor replacement that reconstructive surgery is required. Over the last 20 years at the present authors' institution, 168 such procedures have been performed. Of these, 141 were primary procedures and 27 were reoperations for persisting or recurring symptoms, failed prostheses, and infection. End-result analysis at the latest follow-up examination indicates that all patients are improved in terms of recurrent hemarthroses and pain, and all but two are improved in terms of function. Results are analyzed and compared with existing reports in the world literature in order to determine appropriate indications for surgery and which procedures are most successful.

Adult↗
PubMedDate not supplied

Total femur and total knee replacement. A preliminary report.

Osteogenic sarcoma, a highly malignant tumor of bone, is generally treated by amputation. This is a report of 19 cases of excision of the entire femur because of skip areas which are occasionally seen. The femur usually has the lowest cure rate according to site of involvement. In total femur replacement, the whole bone is removed while the limb is saved. The operation consists of isolating the neurovascular bundle and removing the knee joint and femur including some surrounding normal tissue for margin of safety. The femur and knee replacements are made entirely of metal. The resultant extremity is weak, but functional. The patients can walk without support, but their gait is better using a cane and/or an ischial weight bearing brace.

Adolescent↗
PubMed1987

Cockup deformity of the great toe hallux extensus.

Cockup of the great toe is characterized by persistent extension of the first metatarsophalangeal joint; the interphalangeal joint also may be involved. The syndrome has many causes, all easily diagnosed. Surgery is indicated in nearly every instance and will produce a corrected or improved result. The type of surgery--whether reefing, lengthening, or transposition of tendons, implant arthroplasty, or arthrodesis--is tailored to the underlying cause.

Arthrodesis↗
PubMedDate not supplied

Computed tomography of humeral head cup arthroplasties. A preliminary report.

Computed tomography (CT) was employed to evaluate resurfacing metal cup arthroplasties, in shoulders affected by rheumatoid arthritis. Reconstruction of the information obtained, with the high frequency filter, resulted in an image of the cement and skeletal structures inside the cup. This new application of CT may prove valuable in assessing the complications and results of cup arthroplasties.

Arthritis, Rheumatoid↗
PubMed1988

Implant arthroplasty in the rheumatoid arthritic patient.

Implant arthroplasty was introduced with the intention that it would relieve pain, provide stability, provide motion, and allow the part to be mobilized. It is a relatively recent phenomenon and long-term results remain difficult to predict.

Ankle Joint↗
PubMedDate not supplied

Fracture mechanics principles applied to implant medical devices--a review.

Historically, the fatigue behavior of materials and structures, including biomaterials and implant devices, was analyzed using stress-life (S-N) techniques, i.e. by determining the number of cycles to failure at a calculated peak stress. The development of fracture mechanics technology has made the crack-growth aspect of fatigue analysis a more exact science, providing more precise data on the properties of materials, incorporating more geometric and metallurgical information from the structure, and, in some cases, providing for updated in-service lifetime predictions. Over the past decade, the medical implant industry and researchers have adopted this analytical tool to varying degrees. The result has been the development of some improved materials, operative procedures, and devices, based on a more exact knowledge of the properties most critical to assuring the long-term durability of devices. Examples of the application of fracture mechanics technology to orthopedic and cardiovascular devices and the potential for further applications are reviewed.

Biomechanical Phenomena↗