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 ...
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 ...
How do postural parameters vary during walking in asymptomatic adults? A registration technique of subject-speciﬁc 3D skeletal reconstruction during gait Article dans une revue avec comité de lectureASSI, Ayman; BAKOUNY, Ziad; YARED, Fares; OTAYEK, Joeffroy; BIZDIKIAN, Aren Joe; GHANEM, Ismat; KREICHATI, Gaby; PILLET, Hélène; BONNET, Xavier; SKALLI, Wafa (Elsevier, 2018)Postural skeletal alignment is altered with age due to intervertebral disc and joint degeneration, consequently aﬀecting quality of life (QoL) and activities of daily living, such as gait. Postural alignment parameters of ...
O 095—How do postural parameters vary during gait in children with cerebral palsy? A 3D subject-speciﬁc skeletal segment registration technique Article dans une revue avec comité de lectureMASSAAD, Abir; ASSI, Ayman; BIZDIKIAN, Aren Joe; BAKOUNY, Ziad; KHALIL, Nour; GHANEM, Ismat; PILLET, Hélène; BONNET, Xavier; SKALLI, Wafa (Elsevier, 2018)Postural parameters, calculated in static position on frontal and sagittal radiographs, are altered in ambulant children with cerebral palsy (CP) and are known to be related to gait abnormalities [1,2]. Most of these ...
Development and evaluation of a new methodology for Soft Tissue Artifact compensation in the lower limb Article dans une revue avec comité de lectureLAHKAR, Bhrigu K.; ROHAN, Pierre-Yves; ASSI, Ayman; PILLET, Helene; BONNET, Xavier; THOREUX, Patricia; SKALLI, Wafa (Elsevier BV, 2021)Skin Marker (SM) based motion capture is the most widespread technique used for motion analysis. Yet, the accuracy is often hindered by Soft Tissue Artifact (STA). This is a major issue in clinical gait analysis where ...