The effects of cementless femoral stem shape and proximal surface texture on 'fit-and-fill' characteristics and on bone remodeling

We measured the post-operative radiological "fit and fill" of two different femoral stem designs, one with a straight proximally porous-coated (Bi-Metric, n=50) and the other with a proximally anatomic, hydroxyapatite-coated and distally over-reamed stem (ABG, n=26). A comparison was then...

Full description

Saved in:
Bibliographic Details
Published in:International orthopaedics 2000, Vol.24 (4), p.184-190
Main Authors: LAINE, H.-J, PUOLAKKA, T. J. S, MOILANEN, T, PAJAMÄKI, K. J, WIRTA, J, LEHTO, M. U. K
Format: Article
Language:English
Subjects:
Adult
Aged
Arthroplasty, Replacement, Hip - instrumentation
Biological and medical sciences
Bone Remodeling - physiology
Coated Materials, Biocompatible
Durapatite
Female
Hip Joint - diagnostic imaging
Hip Prosthesis
Humans
Male
Medical sciences
Middle Aged
Original Paper
Orthopedic surgery
Prosthesis Design
Radiography
Retrospective Studies
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Titanium
Treatment Outcome
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We measured the post-operative radiological "fit and fill" of two different femoral stem designs, one with a straight proximally porous-coated (Bi-Metric, n=50) and the other with a proximally anatomic, hydroxyapatite-coated and distally over-reamed stem (ABG, n=26). A comparison was then made between the clinical and radiological 5-year follow-up data of these two series and also of the bone remodeling changes around the stems. The observed differences in "fit and fill" parameters in the metaphyseal region were minute. However, in the diaphyseal bone the straight stem had substantially more cortical contact. The clinical results were excellent for both groups. Subsidence (>2 mm) was more frequent with the anatomical ABG stems, although the ABG stems had better bone ingrowth in the lower metaphyseal area. The present results indicate that the anatomical design may improve the fit and fill of a femoral stem in the metaphysis. On the other hand, a looser fill of the diaphyseal bone made the stems of this type more susceptible to subsidence. The straight stem with tight diaphyseal fit showed excellent stability, but the good bone ingrowth and remodeling around the distal part of the stem indicates stress transfer through this region and increased stress shielding of the proximal metaphyseal femur.
ISSN:0341-2695
1432-5195
DOI:10.1007/s002640000150