Abstract
Sitting-acquired deep tissue injuries (SADTI) are the most serious type of pressure ulcers. In order to investigate the aetiology of SADTI a new approach is under development: a musculo-skeletal model which can predict forces between the chair and the human body at different seated postures. This study focuses on comparing results from a model developed in the AnyBody Modeling System, with data collected from an experimental setup. A chair with force-measuring equipment was developed, an experiment was conducted with three subjects, and the experimental results were compared with the predictions of the computational model. The results show that the model predicted the reaction forces for different chair postures well. The correlation coefficients of how well the experiment and model correlate for the seat angle, backrest angle and footrest height was 0.93, 0.96, and 0.95. The study show a good agreement between experimental data and model prediction of forces between a human body and a chair. The model can in the future be used in designing wheelchairs or automotive seats.
Highlights
IntroductionMore commonly known as pressure sores, are a frequent complication to spinal cord injury (SCI) patients
Pressure ulcers, more commonly known as pressure sores, are a frequent complication to spinal cord injury (SCI) patients
The results from the forces measured during the experiment and the estimated forces from the musculoskeletal model were compared as absolute values and trends of these while changing one parameter at the time
Summary
More commonly known as pressure sores, are a frequent complication to spinal cord injury (SCI) patients. It is estimated that 50–85% of all patients with SCI will experience a pressure ulcer during their life time [27]. These are very general prevalences covering a range of different types of pressure ulcers. The type of pressure ulcers that has motivated the present investigation is the sittingacquired deep tissue injury (SADTI) that wheelchair users, i.e. paraplegic and quadriplegic patients are susceptible to. [1] The prevalence of deep tissue injury is difficult to assess because it is usually only detected after it has reached the skin surface, at which point the injury’s origin is impossible to establish. For a more general introduction to the field of pressure ulcer research has been combined in a comprensive book by Bader, D. et al [3]
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