title: Appositional bone bridging of primary gaps in the dome area of uncemented, porous acetabular components.
abstract: Reported here are two cases of primary hybrid arthroplasties using a cemented stem and an uncemented, porous acetabular component. Because of the configuration of the acetabula, a residual central gap remained after implantation of the socket. Unimpacted grafts were used to fill the spaces. The gaps, amounting to 4 to 5 mm on the postoperative radiographs, had disappeared at the 30-40-month follow-up examination, with no radiolucent lines at the bone-implant interface. Both sockets were evaluated by roentgen stereophotogrammetric analysis for 2 years, and by using this technique for detecting micromovements, central migration as a reason for the disappearance of the gaps was precluded. Bony apposition of primary gaps of up to 5 mm in the central area of well-fixed porous acetabular components seems possible.
authors.affiliation: Department of Orthopaedics, Malmö General Hospital, Sweden.
authors.forename: I
authors.initials: I
authors.lastname: Onsten
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D016025:Bone Transplantation; D002484:Cementation; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis / Q000379:methods*; D006801:Humans; D008875:Middle Aged; D016062:Porosity; D011859:Radiography