title: [Primary stability of press-fit acetabulum cups using a new acetabulum reamer].
abstract: 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.
authors.affiliation: Orthopädische Klinik mit Poliklinik, Friedrich-Alexander-Universität Erlangen-Nürnberg.
authors.forename: V
authors.initials: V
authors.lastname: Hofmeister
authors.forename: R P
authors.initials: RP
authors.lastname: Pitto
authors.forename: M
authors.initials: M
authors.lastname: Schramm
mesh_terms: 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