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ROENTGEN STEREOPHOTOGRAMMETRIC ANALYSIS: AN EFFECTIVE TOOL TO PREDICT IMPLANT SURVIVAL AFTER AN ALL-POLY UNICOMPARTMENTAL KNEE REPLACEMENT. A 10 YEARS FOLLOW-UP STUDY D.Bruni, MD; L.Bragonzoni, PhD; M.Gagliardi, MD; M.Bontempi, PhD; Akkawi I, MD; G.Raspugli,MD, Tedi M, MD; S.Patella, MD; Prof. M.Ma Rizzoli Orthopaedic Institute – Bologna, Italy

D.Bruni, MD; L.Bragonzoni, PhD; M.Gagliardi, MD; M.Bontempi, PhD; Akkawi I, MD; G.Raspugli,MD, Tedi M, MD; S.Patella, MD; Prof. M.Marcacci, MD. Rizzoli

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D.Bruni, MD; L.Bragonzoni, PhD; M.Gagliardi, MD; M.Bontempi, PhD; Akkawi I, MD; G.Raspugli,MD, Tedi M, MD; S.Patella, MD; Prof. M.Marcacci, MD. Rizzoli Orthopaedic Institute Bologna, Italy Slide 2 The RSA system - background What is RSA? Roentgen Stereophotogrammetric Analysis Slide 3 What it is used for? The RSA system - background Slide 4 how it works? The RSA system - background Slide 5 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) Slide 6 Evaluation mode: 1. Clinical evaluation:Knee Society Score (KSS) system [1] 2. Radiographic evaluation: RSA acquisition and software processing of data Materials and Methods Maximum Total Point Motion (MTPM) [1] 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. Slide 7 Results: RSA evaluation Slide 8 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 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 1year MPTM differences between 1-2 year > 0,2mm High risk of Aseptic loosening Slide 12