Materials and Methods 15 patients treated with UKA- allpoly tibial component, marked with tantalum beads. Average age at surgery: 71 years Average Follow Up: 10 years (range 4- 15)
Evaluation mode: 1. Clinical evaluation:Knee Society Score (KSS) system  2. Radiographic evaluation: RSA acquisition and software processing of data Materials and Methods Maximum Total Point Motion (MTPM)  Insall JN, Dorr LD, Scott RD, Scott WN. Rationale of the Knee Society clinical rating system. Clin Orthop Relat Res. 1989 Nov;(248):13-4.
Absolute values within 1° year: MTPM > 2mm in 3/4 revised patients MTPM < 2mm in 11/11 non revised patients MTPM differences between 1°-2° year: >0,2 mm in 4/4 revised patients <0,2mm in 11/11 non revised patients
Conclusions– Take Home Message 1. Even in the long-term static RSA is an efficient tool for the predictive evaluation of the state of fixation of an all-poly UKA 2. MTPM can be used as an early indicator of aseptic loosening: Absolute values > 2mm within 1°year MPTM differences between 1°-2° year > 0,2mm High risk of Aseptic loosening