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 remai...

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Bibliographic Details
Published in:The Journal of arthroplasty 2013-10, Vol.28 (9), p.1618-1624
Main Authors: Sangiorgio, Sophia N., PhD, Ebramzadeh, Edward, PhD, Knutsen, Ashleen R., MS, Borkowski, Sean L., MS, Kalma, Jeremy J., BA, Bengs, Benjamin C., MD
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Hip
bone defect
bone loss
Bone Resorption
Cementation
Femur - surgery
fixation
Hip Prosthesis
Humans
micromotion
Models, Biological
non-cemented arthroplasty
Orthopedics
Prosthesis Failure
revision arthroplasty
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Summary: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, 60 mm 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.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2013.01.017