Year: 1995
Type: dissertation
Abstract: Fatigue fractures of the femoral component of cementless hip prostheses are rare occurrences at present, but may become more widespread in the future as the demand increases for porous coated cementless hip arthroplasty in young, active, and heavy patients.Whereas the fatigue fracture of high strength forged alloys is unlikely, a risk of fatigue fracture may exist for sintered porous coated stems since the fatigue strength of these implants is relatively low.The low fatigue strength of porous coated stems is due to the combined effects of the use of cast alloys, the exposure of the cast alloy to high temperatures during the sintering process, and the presence of stress concentrations where the porous coating beads contact the substrate surface.Furthermore, due to load sharing between the bone and prosthesis, bone loss may increase the risk of stem fracture.Recent dual energy xray absorptiometry measurements have demonstrated substantial and progressive bone loss around cementless prostheses which lead to stem fatigue fracture.Table Bl: Comparison of the finite element and composite beam stresses in the prosthesis.............
Author: Emily A Sun
Language: English
Subfield: Surgery
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2255677906