title: Prospective comparison of differences in bone mineral density adjacent to two biomechanically different types of cementless femoral stems.
abstract: We compared the differences in bone mineral density (BMD) adjacent to two biomechanically different cementless femoral stems (Spotorno and Evolution-K). Measurements were performed within the first week after surgery and 3, 6, 12, and 24 months postoperatively in a prospective study of 31 patients with 37 total hip arthroplasties. A modified Harris hip score and a visual analogue score for patient satisfaction was used to evaluate the clinical outcome. For both stems, dual X-ray absorptiometry measurements revealed a decrease in BMD in Gruen zone 7. Patients with a Spotorno stem also had a significant decrease in BMD in zones 1 and 2. In patients with an Evolution-K stem, there was a positive correlation between the clinical outcome and BMD in Gruen zones 1 and 4. Our data suggest that periprosthetic bone loss is equal to if not less pronounced adjacent to the Evolution-K stem as compared to the Spotorno stem.
authors.affiliation: Department of Clinical Physiology and Nuclear Medicine, Herlev Hospital, University of Copenhagen, Copenhagen, Denmark. bozer@dadlnet.dk
authors.forename: B
authors.initials: B
authors.lastname: Zerahn
authors.forename: G S
authors.initials: GS
authors.lastname: Lausten
authors.forename: I-L
authors.initials: IL
authors.lastname: Kanstrup
mesh_terms: D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D015519:Bone Density; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design