Valgus subsidence of the tibial component in cementless Oxford unicompartmental knee replacement

Journal article

The cementless Oxford unicompartmental knee replacement has been demonstrated to have superior fixation on radiographs and a similar early complication rate compared with the cemented version. However, a small number of cases have come to our attention where, after an apparently successful procedure, the tibial component subsides into a valgus position with an increased posterior slope, before becoming well-fixed. We present the clinical and radiological findings of these six patients and describe their natural history and the likely causes. Two underwent revision in the early post-operative period, and in four the implant stabilised and became well-fixed radiologically with a good functional outcome. This situation appears to be avoidable by minor modifications to the operative technique, and it appears that it can be treated conservatively in most patients. © 2014 The British Editorial Society of Bone and Joint Surgery.

Authors: Liddle, A; Pandit, H; Murray, D; Lobenhoffer, P; Jenkins, C

• Journal: Bone and Joint Journal
• Volume: 96 B
• Issue: 3
• Pages: 345-349
• Publication date: 2014-01-01
• DOI: 10.1302/0301-620X.96B3
• EISSN: 2049-4408