Abstract
The use of orthoses can lead to discomfort due to the abnormal loading of skin in areas that are unaccustomed to support forces. To promote the comfort of the users a standard recommendation for the design of these devices, is to lower these forces. Different strategies can be applied: increase the area of contact and lower the pressure or limit the area of contact to prescribed locations. Although pressure pain thresholds and indications for suitable locations to apply force are available [Pons, 2008], still it is essential to calculate the forces to infer about comfort. The present methodology allows the calculation of the interface forces, in this case between the lower limb and an Ankle-Foot Orthosis (AFO), using a two-dimensional computational multibody dynamics model. The input of this model encompasses the patient’s pathological data from a lab gait. With the ability to calculate the interface forces in the indicated locations, it is possible to design the orthotic device to the required function and comfort.
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