title: Do the cup surface properties influence the initial stability?
abstract: This project tests the relationship between the acetabular cup surface characteristics and their initial stability by comparing uncemented (Trabecular Metal (TM) and Trilogy) and cemented polyethylene shells. We hypothesised that different surface properties of uncemented cups will influence the cup stability. Mounted directly onto host bone, TM and cemented cups were significantly more stable than Trilogy cups (P < 0.01), with minimal difference between TM and cemented cups (P > 0.1). On 100% graft bed, there was marginal difference between all three cup types (P > 0.1). Incremental cavitary and segmental defects resulted in reducing stability, with cemented cups being minimally more stable (P > 0.1). TM cups possess satisfactory initial stability in bone graft constructs. This study demonstrates that TM shells are marginally less stable than cemented cups in the absence of significant host bone contact.
authors.affiliation: University Hospital Southampton NHS Foundation Trust.
authors.forename: Vitali
authors.initials: V
authors.lastname: Goriainov
authors.affiliation: Great Western Hospital, Swindon; University of Southampton.
authors.forename: Andrew
authors.initials: A
authors.lastname: Jones
authors.affiliation: University of Southampton; Invibio Ltd.
authors.forename: Adam
authors.initials: A
authors.lastname: Briscoe
authors.affiliation: University of Southampton.
authors.forename: Andrew
authors.initials: A
authors.lastname: New
authors.affiliation: University Hospital Southampton.
authors.forename: Douglas
authors.initials: D
authors.lastname: Dunlop
mesh_terms: D000077:Acetabulum / Q000503:physiopathology / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip; D001672:Biocompatible Materials; D001696:Biomechanical Phenomena; D001843:Bone Cements; D016025:Bone Transplantation; D002102:Cadaver; D005270:Femur Head / Q000637:transplantation; D006622:Hip Prosthesis; D006801:Humans; D007593:Joint Instability / Q000209:etiology* / Q000503:physiopathology; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D001843:Bone Cements; D020959:Polyethylene
keywords: acetabular defects; bone grafting; initial acetabular cup stability; revision hip arthroplasty; rotational torsional testing