title: Long-term remodeling in proximal femur around a hydroxyapatite-coated anatomic stem: ten years densitometric follow-up.
abstract: Bone remodeling after a hip arthroplasty has been quantified with dual energy x-ray absorptiometry, usually for short-term follow-up. We used this technique to determine the long-term remodeling produced by a hydroxyapatite-coated, anatomic stem. Eighty patients with unilateral hip osteoarthritis were included in the study. The contralateral, healthy hip was taken as control. Bilateral dual energy x-ray absorptiometry scans were done before the surgery, at 15 days, and 1 and 10 years postoperatively. There was a decrease of bone mineral density in zones 1 and 7, which ranged from 12.2% to 27.3% at the end of the first year. There were no changes in zones 1 to 6 from the 1st to the 10th year, but there was a late decrease, up to 42.9%, in zone 7. The changes of bone mineral density promoted by this stem occurred in the first postoperative year. Late loss was seen only in area 7.
authors.affiliation: Department of Orthopaedic Surgery. Miguel Servet University Hospital, Zaragoza, Spain.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Panisello
authors.forename: Luis
authors.initials: L
authors.lastname: Herrero
authors.forename: Vicente
authors.initials: V
authors.lastname: Canales
authors.forename: Antonio
authors.initials: A
authors.lastname: Herrera
authors.forename: Angel A
authors.initials: AA
authors.lastname: Martínez
authors.forename: Jesús
authors.initials: J
authors.lastname: Mateo
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology; D001696:Biomechanical Phenomena; D015519:Bone Density / Q000502:physiology*; D016723:Bone Remodeling / Q000502:physiology*; D017886:Durapatite; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000502:physiology*; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D010012:Osteogenesis / Q000502:physiology*; D011446:Prospective Studies; D013997:Time Factors
chemical_list: D017886:Durapatite