title: Mid-term study of bone remodeling after femoral cemented stem implantation: comparison between DXA and finite element simulation.
abstract: This five-year prospective study was designed to investigate periprosthetic bone remodeling associated with two cemented stem models, ABG-II (Stryker) and VerSys (Zimmer), randomly implanted in patients older than 75 years. The sample consisted of 64 cases (32, ABG-II; 32, VerSys). Inclusion criterion was diagnosis of osteoarthritis recommended for cemented total hip arthroplasty. Besides clinical study, Finite Element (FE) simulation was used to analyze biomechanical changes caused by hip arthroplasty. Bone Mineral Density (BMD) measurements showed a progressive increase in bone mass throughout the entire follow-up period for both stems, well correlated with FE results except in Gruen zones 4, 5, 6 for ABG-II and in zones 4, 5 for VerSys, denoting that remodeling in those zones does not depend on mechanical factors but rather on biological or physiological ones.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Miguel Servet University Hospital, Medicine School, University of Zaragoza, Zaragoza, Spain; Orthopaedic Surgery, Miguel Servet University Hospital, Zaragoza, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Herrera
authors.forename: Sarai
authors.initials: S
authors.lastname: Rebollo
authors.forename: Elena
authors.initials: E
authors.lastname: Ibarz
authors.forename: Jesús
authors.initials: J
authors.lastname: Mateo
authors.forename: Sergio
authors.initials: S
authors.lastname: Gabarre
authors.forename: Luis
authors.initials: L
authors.lastname: Gracia
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D001696:Biomechanical Phenomena; D015519:Bone Density; D016723:Bone Remodeling / Q000502:physiology*; D002484:Cementation; D003198:Computer Simulation; D005260:Female; D005269:Femur / Q000503:physiopathology / Q000601:surgery; D020342:Finite Element Analysis; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008954:Models, Biological; D015207:Osteoarthritis, Hip / Q000503:physiopathology / Q000601:surgery*; D011446:Prospective Studies
keywords: DXA; bone remodeling; cemented prostheses; finite elements; hip prostheses