title: Bone remodeling around porous metal cementless acetabular components.
abstract: Bone remodeling around cementless acetabular components after total hip arthroplasty has not been well characterized. A randomized, prospective study of total hip arthroplasty was performed comparing 2 cementless acetabular implants: a solid titanium and a more elastic porous tantalum design. Seventeen hips (9 porous tantalum, 8 titanium) underwent quantitative computed tomography at mean of 7.7 years, and adjacent bone mineral density (BMD) was calculated. The absolute and relative decrease in BMD from preoperative level was less in zones 9 to 15 mm adjacent to the porous tantalum compared to the titanium component (P <or= .02) and predominated posterosuperiorly. The relative BMD increased in all regions adjacent to the porous tantalum component from 5% to 40% over the control. This data demonstrates stress-shielding likely occurs less around a highly porous metal implant of material with an elastic modulus similar to bone.
authors.affiliation: Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06034-4037, USA.
authors.forename: R Michael
authors.initials: RM
authors.lastname: Meneghini
authors.forename: Kerry S
authors.initials: KS
authors.lastname: Ford
authors.forename: Cynthia H
authors.initials: CH
authors.lastname: McCollough
authors.forename: Arlen D
authors.initials: AD
authors.lastname: Hanssen
authors.forename: David G
authors.initials: DG
authors.lastname: Lewallen
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D015519:Bone Density / Q000502:physiology; D016723:Bone Remodeling / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D011446:Prospective Studies; D013635:Tantalum; D014025:Titanium; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D013635:Tantalum; D014025:Titanium