Abstract
External reaction forc es acting via various body support surfaces are required to support the body und er gravity and exte rn al locomotive forces. These biomechanical forces act on the skin in contact with the body support surface and concomitantly deform the associated subcutaneous tissues. Example s include the forces acting on the buttock tissues during wheelchair propulsion, the forces acting on the plantar foot tissu es during standing and walking, and the forces acting on the residual limb tissues via the prosthetic socket during ambulation. In many contexts of rehabilitation, such as patients who need to be bedridden for a long time, subj ects who are wheelchair-bound because of spinal cord injuries, as well as subj ects with neuropathic feet, excessive exposure to unwarranted forces at the body support interfaces could lead to decubitus ulcer, which is commonly referred to as pressure sore. If these excessive epidermal loadings are not appropriately accommodated or relieved in a timely manner, either actively or passively, they can lead to extreme discomfort and serious clinical complications. This paper reviews our work on the biomechanics of body support interfaces since the mid 90’s and highlights some of the major challenges in pre ssure sore research. This paper summarizes our dynamic pressure measurement studies at the seating/buttock interfaces, the prosthetic socket/residual limb interfaces, and the insole/plantar foot interfaces under various conditions. It revisits a biomechanical criterion for pressure sore, proposed in terms of tissue compaction following interstitial fluid flows under epidermal loading. This paper describes the development of our tissue property assessment apparatus, namely the Tissue Ultrasound Palpation System (TUPS). It also presents our recent experimental studies on the effects of externally applied epidermal loadings on cutaneous blood perfusion. This paper is relevant to the design of these body support surfaces, such as prosthetic sockets, seat cushions and foot orthoses.
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Mak, A.F.T., Tarn, E.W.C., Tsung, B.Y.S., Zhang, M., Zheng, Y.P., Zhang, J.D. (2003). Biomechanics of Body Support Surfaces: Issues of Decubitus Ulcer. In: Hwang, N.H.C., Woo, S.LY. (eds) Frontiers in Biomedical Engineering. Topics in Biomedical Engineering International Book Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8967-3_8
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