The strength of a cement acetabular locking mechanism.
To minimize the morbidity associated with revision of a well-fixed acetabular shell, some surgeons advocate cementing a polyethylene liner into the shell when a liner exchange is not possible. So far the strength of this cement locking mechanism has been measured on only a few specimens. The purpose of this study is to correct that oversight by measuring the push-out and lever-out strengths of an acetabular polyethylene liner cemented into a porous-coated shell. We cemented acetabular liners into porous-coated acetabular shells using first-generation cementing techniques. Each of 30 specimens was tested for its push-out or lever-out strength. The results suggest that the strength of a cemented polyethylene liner locking mechanism is similar to that of an uncemented acetabular shell.
Meldrum
R D
RD
Department of Orthopaedics, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA. rmeldrum@iupui.edu
Hollis
J M
JM
D000077:Acetabulum / Q000601:surgery*; D001696:Biomechanical Phenomena; D019544:Equipment Failure Analysis; D006622:Hip Prosthesis; D006801:Humans; D020959:Polyethylene; D019904:Polymethyl Methacrylate; D011474:Prosthesis Design; D012086:Reoperation
D020959:Polyethylene; D019904:Polymethyl Methacrylate