Tissue Shape and Deformation Versus Pressure as a Characterization of the Seating Interface

Influence of bicycle seat pressure on compression of the perineum: A MRI analysis

“…One fundamental limitation of these indirect approaches is they are unable to determine which structures are compressed and where peak compression occurs in relation to the bicycle seat. Interface pressure, for example, cannot be used to infer internal stress and compression (Levine et al, 1990), and oxygen pressure or blood flow techniques only give insight into vascularity of the dorsal and not the deep penile arteries (Pretorius et al, 2001). The cavernous spaces that contain the deep penile arteries, such as the urethral artery within the corpus spongiosum and the cavernosal arteries within the corpora cavernosa, can reliably be viewed and measured with magnetic resonance imaging (MRI) (John et al, 1999;Pretorius et al, 2001).…”

Pressure changes under the ischial tuberosities of seated individuals during sacral nerve root stimulation

“…Levine et al investigated the dynamic changes in seat interface pressure using surface functional electrical stimulation (FES) of the gluteus maximus [23][24][25]. Interestingly, their results indicated that FES can change the shape of loaded buttocks, which significantly reduces pressure under the ITs and redistributes it over other parts of the seat interface.…”

Pressure Distribution on Wheelchair Cushions in Static Sitting and During Manual Propulsion

“…The most common tests conducted to study the antidecubitus properties of cushions are based on the pressure measurement under the patient's sitting surface, and in general trials in static sitting posture only are performed (Della Valle et al 1992, Levine et al 1990, Shaw 1991, Springle and Schuch 1993. Such a protocol does not consider needs of all the subjects with residual autonomous mobility, for whom are important not only the antidecubitus features, but also the requirements of posture stability, cushion transportability and, in general, comfort while moving with his own wheelchair.…”