title: Comparison of different distal designs of femoral components and their effects on bone remodeling in 1-stage bilateral total hip arthroplasty.
abstract: To evaluate the effects of distal design of a proximally coated femoral component on periprosthetic bone remodeling, we prospectively performed 21 one-stage bilateral total hip arthroplasties using a distally tapered and a distally cylindrical stem with the same proximal design, randomized to side. All hips showed good outcomes clinically and radiographically at the final follow-up, average of 7 years postoperatively. Cancellous condensation was always found in Gruen's zones 2 and 6 around the cylindrical stem and in regions between zones 2 and 3 and between zones 6 and 5 around the tapered stem. Bone mineral density of Gruen's zones 2 and 6 was significantly lower around the tapered stem. These results suggested more distal loading in hips with the tapered stem than in those with the cylindrical stem.
authors.affiliation: Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Jinno
authors.forename: Daisuke
authors.initials: D
authors.lastname: Koga
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Asou
authors.forename: Sadao
authors.initials: S
authors.lastname: Morita
authors.forename: Atsushi
authors.initials: A
authors.lastname: Okawa
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D016723:Bone Remodeling; D005260:Female; D005269:Femur; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design