The Journal of Bone and Joint Surgery (American). 2005;87:1816-1821.
doi:10.2106/JBJS.D.01915
© 2005 The Journal of Bone and Joint Surgery, Inc.
Clinical Performance of a Durasul Highly Cross-Linked Polyethylene Acetabular Liner for Total Hip Arthroplasty at Five Years
Lawrence D. Dorr, MD1,
Zhinian Wan, MD1,
Cambize Shahrdar, MD2,
Leighellen Sirianni, OPA-C1,
Myriam Boutary, BS1 and
Andrew Yun, MD1
1 Arthritis Institute, 501 East Hardy Street, 3rd Floor, Inglewood, CA 90301.
E-mail address for L.D. Dorr:
patriciajpaul{at}yahoo.com
2 The Orthopedic Clinic, Willis Knighton Hospital, 8001 Youree Drive, Suite 600,
Shreveport, LA 71115
Investigation performed at the Arthritis Institute, Inglewood,
California
A video supplement to this article will be available from the
Video Journal of Orthopaedics. A video clip will be
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www.jbjs.org.
The Video Journal of Orthopaedics can be contacted at
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www.vjortho.com.
A commentary is available with the electronic versions of this article,
on our web site
(www.jbjs.org)
and on our quarterly CD-ROM (call our subscription department, at
781-449-9780, to order the CD-ROM).
In support of their research or preparation of this manuscript, one or more
of the authors received grants or outside funding from Zimmer. None of the
authors received payments or other benefits or a commitment or agreement to
provide such benefits from a commercial entity. No commercial entity paid or
directed, or agreed to pay or direct, any benefits to any research fund,
foundation, educational institution, or other charitable or nonprofit
organization with which the authors are affiliated or associated.
Background: Highly cross-linked polyethylene is currently the most
common articulation surface used for total hip arthroplasty. The hypothesis of
the present study was that the Durasul highly cross-linked polyethylene
acetabular liner would have less wear at five years than would a conventional
polyethylene liner used in association with the same total hip replacement
system.
Methods: Forty-three consecutive patients (fifty hips) underwent
total hip replacement with an uncemented titanium porous-coated metal cup and
a Durasul liner that was mated with a 28-mm cobalt-chromium femoral head.
Thirty-one patients (thirty-seven hips) were followed for at least five years.
Thirty-five other patients (thirty-seven hips) underwent total hip
arthroplasty with the same system but with a conventional polyethylene liner,
and these patients also were followed for five years. Clinical assessment was
performed with use of the Harris hip score and a patient self-assessment
examination. Radiographic analysis included measurements of acetabular
component position, fixation, and osteolysis. Femoral head penetration of the
Durasul liners was compared with that of the conventional liners.
Results: The clinical results as determined on the basis of Harris
hip scores and patient self-assessment examinations did not differ between the
Durasul group and the control group. The mean bedding-in penetration was 0.054
± 0.07 mm for the Durasul group and 0.059 ± 0.154 mm for the
control group. The subsequent penetration, with elimination of the bedding-in
wear, resulted in a linear wear rate of 0.029 ± 0.02 mm per year for
the Durasul group, compared with 0.065 ± 0.03 mm per year for the
control group (p < 0.005). The annual penetration at one and five years was
0.074 mm and 0.011 mm, respectively, for the Durasul group, compared with
0.151 mm and 0.04 mm, respectively, for the control group.
Conclusions: While the qualitative wear pattern of the highly
cross-linked polyethylene liner was the same as that of the conventional
polyethylene liner, the annual linear wear rate was 45% of that seen with the
conventional polyethylene liner. Therefore, we believe that these early data
support the continued use of this highly cross-linked polyethylene liner for
total hip arthroplasty.
Level of Evidence: Therapeutic Level III. See
Instructions to Authors for a complete description of levels of evidence.
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