Initial stability of press-fit acetabular components under rotational forces.
The primary goal of this study was to determine the initial press-fit stability in acetabular components without screw fixation. Mechanical testing was performed with the implantation of press-fit acetabular components in cadaveric specimens. No significant difference was found in load to failure testing between 1 and 2 mm of under-reaming. However, there was significant variability in bending forces required to create 150 μm of micromotion ranging from 49.3 N to 214.4 N. This study shows that cups implanted in a press-fit fashion, which are felt to be clinically stable, have high degrees of variability in resisting load and may be at risk for loosening. There is a need for more objective intra-operative techniques to test cup stability.
Department of Orthopaedic Surgery, Orthopaedic Research Laboratory, MCV/VCU Medical Center, Richmond, Virginia.
Keith A
KA
Fehring
Department of Orthopaedic Surgery, Orthopaedic Research Laboratory, MCV/VCU Medical Center, Richmond, Virginia.
John R
JR
Owen
Department of Orthopaedic Surgery, Orthopaedic Research Laboratory, MCV/VCU Medical Center, Richmond, Virginia.
Anton A
AA
Kurdin
Department of Orthopaedic Surgery, Orthopaedic Research Laboratory, MCV/VCU Medical Center, Richmond, Virginia.
Jennifer S
JS
Wayne
Department of Orthopaedic Surgery, Orthopaedic Research Laboratory, MCV/VCU Medical Center, Richmond, Virginia.
William A
WA
Jiranek
D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D001696:Biomechanical Phenomena; D002102:Cadaver; D006621:Hip Joint / Q000503:physiopathology* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008875:Middle Aged; D011474:Prosthesis Design
acetabular component; hip arthroplasty; stability