title: High initial stability in porous titanium acetabular cups: a biomechanical study.
abstract: Initial stability with limited micromotion in uncemented total hip arthroplasty acetabular components is essential for bony attachment and long-term biomechanical fixation. This study compared porous titanium fixation surfaces to clinically established, plasma-sprayed designs in terms of interface stability and required seating force. Porous plasma-sprayed modular and metal-on-metal (MOM) cups were compared to a modular, porous titanium designs. Cups were implanted into polyurethane blocks with1-mm interference fit and subsequently edge loaded to failure. Porous titanium cups exhibited 23% to 65% improvement in initial stability when compared to plasma-sprayed cup designs (P=.01): a clinically significant increase, based on experience and prior literature. The results of this study indicate increased interface stability in porous titanium-coated cups without significantly increasing the necessary force and energy required for full seating.
authors.affiliation: Joint Replacement Surgeons of Indiana Foundation, Inc., Mooresville, Indiana, USA.
authors.forename: Scott R
authors.initials: SR
authors.lastname: Small
authors.forename: Michael E
authors.initials: ME
authors.lastname: Berend
authors.forename: Leah A
authors.initials: LA
authors.lastname: Howard
authors.forename: Renee D
authors.initials: RD
authors.lastname: Rogge
authors.forename: Christine A
authors.initials: CA
authors.lastname: Buckley
authors.forename: Merrill A
authors.initials: MA
authors.lastname: Ritter
mesh_terms: D000077:Acetabulum; D001696:Biomechanical Phenomena; D020099:Coated Materials, Biocompatible; D006622:Hip Prosthesis; D008422:Materials Testing; D011474:Prosthesis Design; D014025:Titanium
chemical_list: D020099:Coated Materials, Biocompatible; D014025:Titanium