title: Does the ingrowth surface make a difference? A retrieval study of 423 cementless acetabular components.
abstract: The effect of factors such as design, alloy and coating type on bony or fibrous tissue ingrowth was evaluated in a study of 423 retrieved cementless acetabular shells representing 16 shell designs. Small-beaded (250μm) porous coatings, either with or without hydroxyapatite (HA) coatings, proved to be the superior porous surface for bone ingrowth. Small-beaded shells that were Duofix coated had predominantly fibrous tissue ingrowth. In addition to bead size, alloy type and surface type have significant effect on bone ingrowth. In contrast, there is no significant association between bone ingrowth and time in situ, with most bone ingrowth occurring early. Although roughened, press-fit shells have acceptable clinical and Registry data, they showed some of the lowest ingrowth/ongrowth scores of all the shells tested.
authors.affiliation: Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Western Australia.
authors.forename: Eric
authors.initials: E
authors.lastname: Swarts
authors.affiliation: Department of Orthopaedics, Royal Perth Hospital.
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Bucher
authors.affiliation: Harry Perkins Institute for Medical Research, MRF Building, Royal Perth Hospital.
authors.forename: Michael
authors.initials: M
authors.lastname: Phillips
authors.affiliation: Faculty of Medicine, University of Western Australia, Crawley, Western Australia.
authors.forename: Francis H X
authors.initials: FH
authors.lastname: Yap
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D002484:Cementation; D020878:Device Removal; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D016348:Osseointegration; D015203:Reproducibility of Results; D012189:Retrospective Studies
keywords: acetabular shells; bone ingrowth; implant retrieval