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KMID : 0386719930050010046
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Journal of the Korean Hip Society
1993 Volume.5 No. 1 p.46 ~ p.53
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Early Mechanical Failure of Polyethylene Liner in Cementless Metal-Backed Cup
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이중명
조덕연/박인섭/이중배
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Abstract
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Successful total hip arthroplasty in its current form was made by Sir John Charnley. The incidence of acetabular loosening appears to increaes at about 5-7 years after surgery. Over the last decade, a number of modifications in acetabular
component
design have been undertaken to solve this problem. In 1971, for purpose of reduction of peak stress occurring in cement and trabecular bone trabecular bone of the acetabulum, Harris reported a series of metal-backed acetabrlar components with
removable
polyethylene liners that could be replaced if excessive wear ocurred. Although long-term survivorship analysis has not demonstrated substantial improvement with the use of metal backing, most current acetabular designs retain the metal backing as
a
means of acetabular fixation. Even more, recent reports of porous-ingrowth of cementless cup have generally been favorable and few revision have been reported. The increasing use of cementless metal-backed acetabular components in total hip
arthroplaty
produced another mechanical interface that may fail: Mechanical failure of polyethylene liner in metal backed cup.
We report two cases of early failure of polyethylene liner in cementless metal backed cup, and
review previously reported articles.
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