ISS 2017 Program
 

 


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IC13: Posture, the Missing Link in Finite Modeling

In a clinical setting the wheelchair's seat angles, knee angles and back support angles are adjusted according to the needs of the individual. Complications associated with these adjustments are common and include: increased stresses at weight bearing tissues, skin integrity issues, sliding and discomfort. But what is exactly the effect of these postural interventions on skin integrity, sliding tendency and the wheelchair user's comfort levels and can these effects be predicted? A 3 dimensional model which incorporates posture of the human body has been developed recently which can be used to investigate seat designs with respect to crash tests, comfort requirements and tissue deformation. This 3 - D model offers the opportunity to compute internal tissue stresses at the buttock area with different postures and seating angles. Because of the vast amount of possible postural adjustment options its effect on tissue loading would be impossible to obtain through clinical trials.
This presentation will show first the general capabilities of 3D Finite Element Modeling incorporating posture and its requirements for the applications to assess wheelchair designs and tissue deformation. Finally results regarding the influence of the posture and seat angles on tissue loads will be presented

 

Learning Objectives:

Upon completion of this session, attendees will be able to;

 

Faculty:

Alexander Siefert, PhD

Wolfel
Hochberg
Germany

Alexander Siefert has worked at Wolfel since 2003 and currently leads the Seating Department as an Engineering Director. He earned his PhD at the TU Darmstadt, focusing on the topic of "numerical modeling of mechanical properties of the human tissue and its implementation in a whole-body model." He published several papers in the field of human body modeling, and has given numerous presentations at international conferences for seating, human modeling, and pressure sores.

Bart Van Der Heyden
Wolfel
Hochberg
Germany

Bart is a licensed PT and has practiced as a physical therapist in Belgium, Germany and the UNITED STATES. He is specialised in wheelchair seating & mobility as well as wound care for more than 19 years.
He maintains a strong hands on working experience and helps out in the private physio practise (De Kine = Physical Therapy Practise) of his wife. He assesses many wheelchair users and provides innovative solutions for specific seating, mobility or wound care related concerns.

 

References:

    1. Siefert, A., & Siebert, T. (2012). Passive and Active Muscle Tissue Approach for Human Body Model CASIMIR. Proceedings of CMBBE 2012, Berlin, Germany, April 2012.
    2. Siefert, A., Pankoke, S., Wolfel, H-P. (2008). Virtual optimisation of car passenger seats : Simulation of static and dynamic effects on drivers' seating comfort. International Journal of Industrial Ergonomics. 38, 410 - 424.
    3. Oomens, C. et al (2003). Finite element Modelling of contracting skeletal muscle. Philosophical Transactions of the Royal Society B. 358, 1453-1460.



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