[Primary stability of press-fit acetabulum cups using a new acetabulum reamer].
The aim of the present study was to assess the initial stability of uncemented press-fit acetabular components using a newly developed reamer designed to optimize the surgical preparation of the acetabulum. Ten synthetic human pelves were used to investigate the stability of 20 uncemented press-fit acetabular components, each of which was tested in a servohydraulic testing machine for 6 cycles under an axial load of 2.4 kN. The results of the micrometric measurements revealed satisfactory stability for a reaming depth of 2 mm, and a press-fit of 2 mm. Micromotion was less than 200 microns in all the anatomical sections of the acetabulum (ischium 63 microns, pubis 150 microns, ilium 85 microns). A press-fit of 4 mm and the smaller reaming depth of 1 mm were associated with a substantial decrease in mechanical stability.
Hofmeister
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Orthopädische Klinik mit Poliklinik, Friedrich-Alexander-Universität Erlangen-Nürnberg.
Pitto
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Schramm
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D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D019544:Equipment Failure Analysis; D006622:Hip Prosthesis; D006801:Humans; D011474:Prosthesis Design; D017755:Prosthesis Fitting