Valgus subsidence of the tibial component in cementless Oxford unicompartmental knee replacement.
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.
['Liddle|A D|AD|', 'Pandit|H G|HG|', 'Jenkins|C|C|', 'Lobenhoffer|P|P|', 'Jackson|W F M|WF|', 'Dodd|C A F|CA|', 'Murray|D W|DW|']
D000368:Aged D019645:Arthroplasty, Replacement, Knee D005260:Female D006801:Humans D007720:Knee Prosthesis D008297:Male D008875:Middle Aged D020370:Osteoarthritis, Knee D011183:Postoperative Complications D011474:Prosthesis Design D011859:Radiography D012086:Reoperation D013977:Tibia D017211:Treatment Failure D016896:Treatment Outcome
Unicompartmental knee replacement Revision Arthroplasty Cementless fixation Hydroxyapatite Loosening