RESUMEN
Background: The treatment of isolated internal tibiofemoral knee osteoarthritis on young and active patients is controversial. This treatment can be a high tibial osteotomy or a joint replacement that can be a partial unicompartmental knee arthroplasty [UKA] or total knee replacement [TKR]. The aim of our study is the long-term evaluation of functional outcome of partial unicompartmental knee arthroplasty [UKA] in elderly patients under than 60 years
Methods: This is a retrospective study of 25 unicompartmental knee arthroplasties in 22 patients, collected between1993 and 2003 whose age was less than 60 years. The minimum follow-up was 10 years. At last follow, an analysis of IKS score [International Knee Score] with assessment of both articular and functional components have been established. The Radiological score of Knee Society [KS] was used
Results: At mean 14.2 years [min: 10, max: 20], the mean of knee flexion was 110 [degree sign]. The IKS function score going 47 points preoperatively to 77 points postoperatively and IKS score 40 points knee preoperatively to 94 points postoperative. The radiological assessment found a postoperative mean tibiofemoral mechanical axis of 174.8 [degree sign] [172 [degree sign] min, max 182 [degree sign]]. The survival of implants at 12 years postoperatively was 84%
The survival of the prostheses was de84 to 12%, with a revision for polyethylene wear, a second for conflict of the femoral component with tibia thorns responsible of chronic pain, a third revision for infection and two for osteoarthritis evolution
Conclusion: The long-term evaluation of patients with a unicompartmental does not objective an obvious deterioration of outcome with a normal rate of revision comparatively to other series without particular difficulties during revision