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Background

The acknowledged benefit of the direct anterior (DA) approach is early functional return. Most surgeons in the U.S. use cementless femoral replacement given the negative track record of some cemented designs. However, delayed osseointegration of a femoral stem typically seen in older patients with poor bone quality will delay recovery, diminishing the benefits of the DA approach. Registry studies have shown a higher revision rate and complications in this patient population leading to a renewed interest in cemented fixation.

Questions posed

To achieve the functional benefits of the DA approach and the fixation benefits of cemented replacement, this study combined the 2 techniques posing the following questions:1) Does the limited access of the DA approach adversely affect the cement technique? 2) Does such a cementing technique reduce the incidence of cementless complications?


The Bone & Joint Journal
Vol. 98-B, Issue 10_Supple_B | Pages 34 - 40
1 Oct 2016
Emerson RH Alnachoukati O Barrington J Ennin K

Aims

Approved by the Food and Drug Administration in 2004, the Phase III Oxford Medial Partial Knee is used to treat anteromedial osteoarthritis (AMOA) in patients with an intact anterior cruciate ligament. This unicompartmental knee arthroplasty (UKA) is relatively new in the United States, and therefore long-term American results are lacking.

Patients and Methods

This is a single surgeon, retrospective study based on prospectively collected data, analysing a consecutive series of primary UKAs using the Phase III mobile-bearing Oxford Knee and Phase III instrumentation.

Between July 2004 and December 2006, the senior author (RHE) carried out a medial UKA in 173 patients (213 knees) for anteromedial osteoarthritis or avascular necrosis (AVN).

A total of 95 patients were men and 78 were women. Their mean age at surgery was 67 years (38 to 89) and mean body mass index 29.87 kg/m2 (17 to 62).

The mean follow-up was ten years (4 to 11).