Subject-specific musculoskeletal model of the lower limb in a lying and standing position
Article dans une revue avec comité de lecture
Accurate estimation of joint loads implies using subject-specific musculoskeletal models. Moreover, as the lines of action of the muscles are dictated by the soft tissues, which are in turn influenced by gravitational forces, we developed a method to build subject-specific models of the lower limb in a functional standing position. Bones and skin envelope were obtained in a standing position, whereas muscles and a set of bony landmarks were obtained from conventional magnetic resonance images in a lying position. These muscles were merged with the subject-specific skeletal model using a nonlinear transformation, taking into account soft tissue movements and gravitational effects. Seven asymptomatic lower limbs were modelled using this method, and results showed realistic deformations. Comparing the subject-specific skeletal model to a scaled reference model rendered differences in terms of muscle length up to 4% and in terms of moment arm for adductor muscles up to 30%. These preliminary findings enlightened the importance of subject-specific modelling in a functional position.
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Article dans une revue avec comité de lectureJOLIVET, Erwan; DION, Elisabeth; ROUCH, Philippe; DUBOIS, Guillaume; CHARRIER, Remi; PAYAN, Christine; SKALLI, Wafa (Informa UK Limited, 2014)Magnetic resonance imaging (MRI) and computed tomography scans are used to assess muscle volume, but the manual segmentation, slice by slice, is long and tedious. We proposed an improvement in the deformation of a ...
A reference method for the evaluation of femoral head joint center location technique based on external markers Article dans une revue avec comité de lecturePILLET, Hélène; SANGEUX, Morgan; HAUSSELLE, Jérôme; EL RACHKIDI, Rami; SKALLI, Wafa (Elsevier, 2014)Accurate localization of joint centers is essential in movement analysis. However, joint centers cannot be directly palpated and alternative methods must be used. To assess the relative merits of these methods, a medical ...
Tibio-femoral joint constraints for bone pose estimation during movement using multi-body optimization Article dans une revue avec comité de lectureBERGAMINI, Elena; PILLET, Hélène; HAUSSELLE, Jérôme; THOREUX, Patricia; GUERARD, Sandra; CAMOMILLA, Valentina; CAPPOZZO, Aurelio; SKALLI, Wafa (Elsevier, 2011)When using skin markers and stereophotogrammetry for movement analysis, bone pose estimation may be performed using multi-body optimization with the intent of reducing the effect of soft tissue artefacts. When the joint ...
Validation of hip joint center localization methods during gait analysis using 3D EOS imaging in typically developing and cerebral palsy children Article dans une revue avec comité de lectureASSI, Ayman; SAURET, Christophe; MASSAAD, Abir; BAKOUNY, Ziad; PILLET, Hélène; SKALLI, Wafa; GHANEM, Ismat (Elsevier, 2016)Localization of the hip joint center (HJC) is essential in computation of gait data. EOS low dose biplanar X-rays have been shown to be a good reference in evaluating various methods of HJC localization in adults. The aim ...
Article dans une revue avec comité de lectureREBEYRAT, Guillaume; SKALLI, Wafa; RACHKIDI, Rami; PILLET, Hélène; MASSAAD, Abir; MEHANNA, Joe; SEMAAN, Karl; SAAD, Eddy; GHANEM, Ismat; ASSI, Ayman (Springer Science and Business Media LLC, 2022)Purpose: To assess dynamic postural alignment in ASD during walking using a subject-specific 3D approach. Methods: 69 ASD (51 ± 20 years, 77%F) and 62 controls (34 ± 13 years, 62%F) underwent gait analysis along with ...