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QUANTIFICATION OF THE PERFORMANCE OF MONO- AND BI-PLANAR 3D FLUOROSCOPY COMPARED TO MARKER-BASED RSA

Accurate knowledge of joint kinematics is fundamental for research and clinical purposes. Radiologic based joint kinematic estimation technique have been recently used to study intact joint in-vivo kinematics. Bi-planar methods are more accurate but expensive and invasive, while mono-planar ones are less reliable but more suitable for the clinical practice. The aim of the present work is to quantify the performance of a novel alignment algorithm, through a comparison of monoand bi-planar fluoroscopic methods using the marker based Roentgen stereophotogrammetric analysis as gold-standard. Five repetitions of a simulated walking task with bone phantoms were analyzed. The dominant source of error for the bi-planar method was the longitudinal symmetry of the bones. The mono-planar technique was limited in the estimation of the out-of-plane pose parameters, but as good as bi-planar for the in-plane pose parameters. With error of the order of the millimeter and the degree, considering the limited cost and analysis time, monoplanar fluoroscopy can be sufficient for clinical analysis.