title: Fixation of non-cemented total hip arthroplasty femoral components in a simulated proximal bone defect model.
abstract: An accelerated sequential proximal femoral bone loss model was used to measure the initial stability of three noncemented femoral stem designs: fully porous-coated, proximally porous-coated, and dual-tapered, diaphyseal press-fit (N=18). Only dual-tapered, diaphyseal press-fit stems remained stable with as much as 105 mm of bone loss, with average cyclic micromotion remaining below 25 μm in ML and below 10 μm in AP planes. In contrast, with proximally coated and fully coated stem designs with circular or oval cross-sections, 60mm of bone loss, resulting in lower than 10 cm of diaphyseal bone contact length, led to gross instability, increasing average cyclic micromotions to greater than 100 μm prior to failure. Therefore, the results provide support for using a dual-tapered stem in revision cases with proximal bone loss.
authors.affiliation: The J. Vernon Luck, Sr. Orthopaedic Research Center, Los Angeles Orthopaedic, Hospital/UCLA, Los Angeles, California; UCLA and Orthopaedic Hospital Department of Orthopaedic Surgery, University of California, Los Angeles, California.
authors.forename: Sophia N
authors.initials: SN
authors.lastname: Sangiorgio
authors.forename: Edward
authors.initials: E
authors.lastname: Ebramzadeh
authors.forename: Ashleen R
authors.initials: AR
authors.lastname: Knutsen
authors.forename: Sean L
authors.initials: SL
authors.lastname: Borkowski
authors.forename: Jeremy J
authors.initials: JJ
authors.lastname: Kalma
authors.forename: Benjamin C
authors.initials: BC
authors.lastname: Bengs
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D001862:Bone Resorption; D002484:Cementation; D005269:Femur / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008954:Models, Biological; D011475:Prosthesis Failure
keywords: bone defect; bone loss; fixation; micromotion; non-cemented arthroplasty; revision arthroplasty