Tehran University of Medical Sciences Journal of Modern Rehabilitation 2538-385X 10 1 2016 08 28 13 17 EN Seyedeh Zahra Anousheh MSc, Department of Orthotics & Prosthetic, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Behnam Hajiaghaei Lecturer, Department of Orthotics & Prosthetic, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Hassan Saeedi Assistant Professor, Department of Orthotics & Prosthetic, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Hossein Gholizadeh Postdoctoral Fellow, Department of Rehabilitation, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Canada. 2016 08 28 2016 08 28 Introduction: Transtibial amputation is the most common amputation in lower limbs. Volume loss of residual limb occurs during daily use of prostheses, which results in pistoning between residual limb and prosthetic socket. The goal of this study was to design and fabricate a pneumatic suspension system in transtibial supracondylar prostheses and to evaluate its effect on residual limb pistoning. Material and Methods: Five unilateral transtibial amputees were participated in this study. After designing and fabricating pneumatic  suspension system,  its  effect  on  residual  limb pistoning was evaluated using photographic method in five static stages including full weight bearing, semi weight bearing, non-weight bearing, 30 N and 50 N loads. Results: Residual limb pistoning was reduced using pneumatic suspension system during non- weight bearing, 30 N and 50 N static loading. Conclusion:   The   use   of   pneumatic   suspension   system   would   reduce pistoning   in supracondylar transtibial prostheses. https://jmr.tums.ac.ir/index.php/jmr/article/view/3 https://jmr.tums.ac.ir/index.php/jmr/article/download/3/11