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Published in: Clinical Orthopaedics and Related Research® 2/2011

01-02-2011 | Symposium: Papers Presented at the Hip Society Meetings 2010

The Incidence of Acetabular Osteolysis in Young Patients With Conventional versus Highly Crosslinked Polyethylene

Authors: Nathan A. Mall, MD, Ryan M. Nunley, MD, Jin Jun Zhu, MD, PhD, William J. Maloney, MD, Robert L. Barrack, MD, John C. Clohisy, MD

Published in: Clinical Orthopaedics and Related Research® | Issue 2/2011

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Abstract

Background

Osteolysis is a major mode of hip implant failure. Previous literature has focused on the amount of polyethylene wear comparing highly crosslinked polyethylene (HXPLE) with conventional liners but has not clarified the relative incidence of osteolysis with these two liners.

Questions/purposes

We determined (1) the incidence of osteolysis in HXLPE versus conventional polyethylene (CPE), (2) the ability to detect and evaluate the size of lytic lesions using radiographs compared with CT scans, (3) head penetration in hips without and with lysis, and (4) determined whether acetabular position, head size, and UCLA activity score contributed to lysis.

Methods

We compared head penetration and osteolysis on plain radiographs and presence and volume of osteolysis on CT scans in 48 patients with HXLPE (mean, 46.5 years) and 50 patients with CPE (mean, 43.2 years). The minimum followup was 5 years (average, 7.2 years; range, 5.1–10.9 years),

Results

Osteolysis was apparent on CT in a larger number of patients with CPE liners than HXLPE liners: 12 of 50 (24%) versus one of 48 (2%), respectively. We found no correlation between head penetration and volume of osteolytic lesions. Head penetration was greater in patients with osteolysis. Smaller head sizes were associated with greater wear and those with osteolysis had smaller head sizes; however, there was no difference in acetabular component position or UCLA activity in those with lysis compared with those without.

Conclusions

HXLPE diminished the incidence of osteolysis, but the lack of correlation between penetration and volume of osteolysis suggests other factors other than wear contribute to the development of osteolysis.

Level of Evidence

Level III, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
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Metadata
Title
The Incidence of Acetabular Osteolysis in Young Patients With Conventional versus Highly Crosslinked Polyethylene
Authors
Nathan A. Mall, MD
Ryan M. Nunley, MD
Jin Jun Zhu, MD, PhD
William J. Maloney, MD
Robert L. Barrack, MD
John C. Clohisy, MD
Publication date
01-02-2011
Publisher
Springer-Verlag
Published in
Clinical Orthopaedics and Related Research® / Issue 2/2011
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI
https://doi.org/10.1007/s11999-010-1518-y

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