Analysis of humeral head displacements from sequences of biplanar X-rays: repeatability study and preliminary results in healthy subjects |
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| Authors: | Pierre-Yves Lagacé Fabien Billuart Xavier Ohl Wafa Skalli Patrice Tétreault Jacques de Guise |
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| Institution: | 1. Laboratoire de recherche en imagerie et orthopédie, Centre de recherche du Centre hospitalier de l'Université de Montréal , Montréal , Québec , Canada;2. Laboratoire de Biomécanique, Arts et Metiers ParisTech CNRS , Paris , France;3. école de technologie supérieure , Montréal , Québec , Canada pierre-yves.lagace.1@ens.etsmtl.ca;5. Laboratoire de Biomécanique, Arts et Metiers ParisTech CNRS , Paris , France;6. Service d'orthopédie, Centre hospitalier de l'Université de Montréal , Montréal , Québec , Canada;7. école de technologie supérieure , Montréal , Québec , Canada |
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| Abstract: | This work presents an accurate method to measure gleno-humeral translations in a controlled pseudo-kinematic environment. Low-dose biplanar X-rays were acquired from nine healthy subjects at three elevations of the arm in the scapular plane. On each set of images, shoulder bony landmarks were manually located in 3D using a dedicated software. Intra-observer and inter-observer repeatability of landmark identification, as well as humeral head center (GH) translations, were studied. Repeatability for the identification of GH in the global coordinate system (CS) was good with 95% confidence intervals (CIs) ranging from 0.57 to 2.25 mm. Scapular landmark CIs ranged from 0.80 to 12 mm. Gleno-humeral translations of small amplitude ( < 6 mm) were detected in seven out of nine subjects. The results obtained here confirm that calibrated low-dose stereo-radiography is a promising tool for the functional analysis of the shoulder. |
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| Keywords: | shoulder repeatability stereo-radiography gleno-humeral bony landmarks |
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