Real-time patient-specific finite element analysis of residual limb stresses in transtibial amputees during treadmill walking

Portnoy, Sigal; Yarnitzky, G.; Yizhar, Ziva; Kristal, Anat; Oppenheim, U.; Siev-Ner, Itzhak; Gefen, Amit

doi:10.1016/s0021-9290(06)85216-4

Cited by 2 publications

(1 citation statement)

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“…Derler and Gerhardt, 1 for instance, comprehensively reviewed the effect of different factors on skin friction such as skin surface roughness, superficial sebum, epidermal skin hydration, mechanical properties of skin and physicalchemical properties of contacting materials. Furthermore, some authors have based their studies on different parameters involved in activities where the skin is in cyclic contact against fabrics, 2 socketstump interaction for transtibial and transfemoral amputees during socket donning procedure 3 and gait 4,5 and cosmetic product application. [6][7][8] In vivo assessment of skin tribological response is a challenging task affected by many factors, namely: differences of skin characteristics such as oiliness, moisture, roughness, scars and hair presence 7,9 age, gender and ethnic group.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of friction coefficient between polypropylene and human skin using instrumented sclerometer

Ramírez

Pavón

Toro

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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Prosthetic devices are used to restore as much as possible not only the functionality, but also the self-esteem of patients who have been submitted to amputation surgeries. Typically, lower limb prostheses need a socket to act as a link with the human stump, so the contact stresses at the socket–stump interface are critical for the recovery process and the subsequent comfort perception of the patient as well. In this work, a broad experimentation to establish the coefficient of friction (COF) between socket material (polypropylene) and human skin was developed with the aid of an instrumented sclerometer, which was adapted to put in contact a polypropylene probe with human forearms. Seven factors were considered, but only sweat and hair skin were found to have a significant effect on COF, which varied from 0.22 to 0.45 in the tests. Lower values of COF were obtained when sweat was present at the interface, while the absence of both sweat and hair skin led to the highest value. The results are believed to be relevant for developing reliable finite element (FE) models for socket–stump interaction since the relation between normal and shear stresses at the interface of two interacting bodies is strongly determined by the COF.

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