Analysis of the influence of the seat foam density in the posture of hemiplegic wheelchair users using computerized photogrammetry

Abstract

The use of a wheelchair after a stroke is often necessary, and this device can assist in support and proper positioning in sitting posture. However, there is not much scientific evidence proving the benefits of adaptations in wheelchairs for individuals with a motor and sensory impairments, mainly those with hemiplegia. The aim of this study is to assess whether adaptation with foam of different densities is effective in improving the sitting posture of hemiplegic wheelchair users. The study was carried out on 18 participants (seven female and eleven male), hemiplegics, wheelchair users and with an average age = 61. The computerized photogrammetry technique was used to analyze the posture of the participants sitting in foams of different densities. In order to perform the statistical analysis, the Shapiro–Wilk hypothesis test was used to assess the normality of the data. The results highlight the improvement not only in pelvic alignment, but also the trunk and head using different combinations of density foam seats. In addition, the results suggest that the use of densities 33 kg/m3 and 40 kg/m3 is sufficient to have a better body alignment.