Component Position and Metal Ion Levels in Computer-navigated Hip Resurfacing Arthroplasty

Abstract Background Metal ion levels are used as a surrogate marker for wear in hip resurfacing arthroplasties. Improper component position, particularly on the acetabular side, plays an important role in problems with the bearing surfaces, such as edge loading, impingement on the acetabular compone...

Full description

Saved in:
Bibliographic Details
Published in:The Journal of arthroplasty 2017-01, Vol.32 (1), p.119-124
Main Authors: Mann, Stephen M., MD, FRCS(C), Kunz, Manuela, PhD, Ellis, Randy E., PhD, Rudan, John, MD, FRCSC
Format: Article
Language:English
Subjects:
Acetabulum
Adult
Aged
Arthroplasty, Replacement, Hip - methods
Biomarkers
Chromium - blood
Cobalt - blood
Cohort Studies
component position
computer navigation
Female
Femur - surgery
Hip - surgery
Hip Joint - surgery
Hip Prosthesis - adverse effects
hip resurfacing
Humans
ion levels
Male
metal-on-metal
Metal-on-Metal Joint Prostheses - adverse effects
Metals
Middle Aged
Multivariate Analysis
Orthopedics
Prosthesis Design
Prosthesis Failure
Surgery, Computer-Assisted
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Abstract Background Metal ion levels are used as a surrogate marker for wear in hip resurfacing arthroplasties. Improper component position, particularly on the acetabular side, plays an important role in problems with the bearing surfaces, such as edge loading, impingement on the acetabular component rim, lack of fluid film lubrication, and acetabular component deformation. There is little data regarding femoral component position and its possible implications on wear and failure rates. The purpose of this investigation was to determine both femoral and acetabular component positions in our cohort of mechanically stable hip resurfacing arthroplasties, and to determine if these were related to metal ion levels. Methods One hundred and fourteen patients who had undergone a computer-assisted metal-on-metal hip resurfacing were prospectively followed. Cobalt and chromium levels, Harris Hip and UCLA Activity scores in addition to measures of the acetabular and femoral component position and angles of the femur and acetabulum were recorded. Results Significant changes included increases in the position of the acetabular component compared to the native acetabulum, increase in femoral vertical offset and decreases in global offset, gluteus medius activation angle, and abductor arm angle (p
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2016.06.028