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Postoperative alignment just after Oxford medial unicompartmental knee arthroplasty affect lateral osteoarthritis progression?
Author(s):
Hara K. (Japan)
,
Hara K. (Japan)
Affiliations:
Tatsumi I.
,
Tatsumi I.
Affiliations:
Matsue R.
Matsue R.
Affiliations:
ESSKA Academy. Hara K. 05/09/18; 209602; P10-1039 Topic: Joint Replacement
Dr. Kenji Hara
Dr. Kenji Hara
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Abstract
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Objectives: The aim of this study is to assess that postoperative alignment just after Oxford medial unicompartmental knee arthroplasty (UKA) affect lateral osteoarthritis (OA) progression.

Methods: A total of 393 UKAs were performed for OA of the knee from February 2012 to September 2015 at our institution. We analyzed the lateral OA progression after UKA retrospectively at a minimum of one year follow-up. We measured femoro-tibial angle (FTA) on the preoperative, the immediate postoperative, and the latest follow-up postoperative X-ray. All the cases were divided into the two groups, Valgus group and non-Valgus group, according to the immediate postoperative FTA. Valgus group had 16 cases those FTA was under 173 degree, non-Valgus group had 377 cases those FTA was 173 and more. We defined Change of FTA that was calculated the difference between the immediate postoperative FTA and the latest FTA. We compared the lateral OA progression, preoperative FTA and Change of FTA between the two groups.

Results: In Valgus group, the lateral OA progression was observed in 3 cases (18.8%), in non-Valgus group, 17 cases (4.5%) were observed. In valgus group, the lateral OA progression more occurred than in non-Valgus group (p=0.041). The preoperative FTA was 183.1±4.6 degree and 186.4±4.6 degree, respectively. The preoperative FTA in Valgus group was smaller than that of in non-Valgus group (p=0.005). There was no significant difference in Change of FTA between the two groups.

Conclusions: The lateral OA progression can be occurred, when the postoperative alignment is valgus. We should avoid over correct when we choose the thickness of bearing, and should also take care not to damage MCL. However, the lateral OA progression was occurred in spite of normal alignment postoperatively. We have to more research the reason why the lateral OA progression is occurred in normal alignment postoperatively.

Keywords:
Oxford UKA, lateral OA, alignment
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