Original Article

Medical & Biological Engineering & Computing

, Volume 51, Issue 3, pp 257-265

In vitro quantification of the performance of model-based mono-planar and bi-planar fluoroscopy for 3D joint kinematics estimation

  • Luca TersiAffiliated withHealth Sciences and Technologies, Interdepartmental Center for Industrial Research (HST-ICIR), University of Bologna Email author 
  • , Arnaud BarréAffiliated withLaboratory of Movement Analysis and Measurement (LMAM), Ecole Polytechnique Fédérale de Lausanne (EPFL)
  • , Silvia FantozziAffiliated withHealth Sciences and Technologies, Interdepartmental Center for Industrial Research (HST-ICIR), University of BolognaDepartment of Electrical, Electronic, and Information Engineering ″Guglielmo Marconi″ (DEI), University of Bologna
  • , Rita StagniAffiliated withHealth Sciences and Technologies, Interdepartmental Center for Industrial Research (HST-ICIR), University of BolognaDepartment of Electrical, Electronic, and Information Engineering ″Guglielmo Marconi″ (DEI), University of Bologna

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Abstract

Model-based mono-planar and bi-planar 3D fluoroscopy methods can quantify intact joints kinematics with performance/cost trade-off. The aim of this study was to compare the performances of mono- and bi-planar setups to a marker-based gold-standard, during dynamic phantom knee acquisitions. Absolute pose errors for in-plane parameters were lower than 0.6 mm or 0.6° for both mono- and bi-planar setups. Mono-planar setups resulted critical in quantifying the out-of-plane translation (error < 6.5 mm), and bi-planar in quantifying the rotation along bone longitudinal axis (error < 1.3°). These errors propagated to joint angles and translations differently depending on the alignment of the anatomical axes and the fluoroscopic reference frames. Internal-external rotation was the least accurate angle both with mono- (error < 4.4°) and bi-planar (error < 1.7°) setups, due to bone longitudinal symmetries. Results highlighted that accuracy for mono-planar in-plane pose parameters is comparable to bi-planar, but with halved computational costs, halved segmentation time and halved ionizing radiation dose. Bi-planar analysis better compensated for the out-of-plane uncertainty that is differently propagated to relative kinematics depending on the setup. To take its full benefits, the motion task to be investigated should be designed to maintain the joint inside the visible volume introducing constraints with respect to mono-planar analysis.

Keywords

3D Fluoroscopy Joint kinematics Mono-planar Bi-planar Roentgen stereophotogrammetric analysis