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· DOS Abstracts
Safety of Vitamin E infused high wall liners for
routine use in primary THA: Single center, short
term follow-up of 767 cases
Nanna Sillesen Hylleholt, Christopher Barr J., Peter Gebuhr, Henrik Malchau,
Henrik Husted, Troelsen Anders
Department of Orthopedics Copenhagen University Hospital Hvidovre,
Hvidovre Hospital; Harris Orthopaedic Laboratory, department of orthopedics,
Massachusetts General Hospital, Harvard Medical School
Background:
Vitamin E infused highly crosslinked polyethylene liners (VEPE)
offer the potential for reduced wear and osteolysis. The extended liners, includ-
ing the high wall type, leaving parts of the polyethylene uncovered, have been
hypothesized to result in increased wear and the potential for liner fracture.
Introduction of new implants should be monitored closely to capture any signs
of compromising patient safety.
Purpose / Aim of Study:
The aim of this study was to determine the short-
term safety profile of high wall VEPE for primary total hip replacement (THA),
focusing on liner related complications.
Materials and Methods:
We included 767 consecutive THAs operated from
July 2010 to March 2013 with use of a high wall VEPE liner (E1, Biomet). The
preferred components used were an uncemented cup (Exceed ABT, Biomet
(100 %) and an uncemented stem (Bimetric, Biomet (98 %)). Majority of heads
were size 36mm (67 %) and 32mm (32 %).The data collected included demo-
graphics, implant data, complications, reoperations, and deaths. Acetabular cup
position was measured using Martell Hip Analysis Suite in a subgroup of 407
THAs. Length of follow- up was 1.1-3.8 years.
Findings / Results:
There were no revisions due to liner failure. Revisions in-
cluded 5 open reductions, 11 soft-tissue revisions for infection, 28 isolated
stem revisions (periprosthetic fractures), 2 isolated cup revisions, and 7 com-
bined cup and stem revisions. The subgroup with cup position measurements
showed 77% were in the combined acceptable zone of cup abduction (30-55°)
and version (5-35°).
Conclusions:
Early follow-up of routine use of VEPE high wall liners for primary
THA have not shown any liner associated complications or revisions. Continued
monitoring of new materials are important to capture any signs of compromised
patient safety.
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