Chest Pain (GERD) Dimitrios Stefanidis, MD, PhD Steven B. Goldin, MD, PhD.
D.Bruni, MD; L.Bragonzoni, PhD; M.Gagliardi, MD; M.Bontempi, PhD; Akkawi I, MD; G.Raspugli,MD, Tedi...
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Transcript of D.Bruni, MD; L.Bragonzoni, PhD; M.Gagliardi, MD; M.Bontempi, PhD; Akkawi I, MD; G.Raspugli,MD, Tedi...
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.Marcacci, MD.
Rizzoli Orthopaedic Institute – Bologna, Italy
The RSA system - background
What is RSA?
Roentgen Stereophotogrammetric Analysis
What it is used for?
The RSA system - background
how it works?
The RSA system - background
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 [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.
Results: RSA evaluation
Results: RSA evaluation
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
Clinical results
Results: Clinical-radiographic correlation
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
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