Article: PDF OnlyProsthetic foot rollover shapes with implications for alignment of transtibial prosthesesHansen, A. H.1; Childress, D. S.2,3; Knox, E. H.4 Author Information 1Department of Biomedical Engineering, Northwestern University, 345 East Superior Street, Room 1441, Chicago, IL, 60611, USA 2Department of Physical Medicine and Rehabilitation and Department of Biomedical Engineering, Northwestern University, Chicago, IL, USA 3Rehabilitation Engineering Research Center and Prosthetics Research Laboratory, Northwestern University Medical School, Chicago, IL, USA 4Engineering Systems Incorporated, Aurora, IL, USA Prosthetics and Orthotics International: December 2000 - Volume 24 - Issue 3 - p 205-215 doi: 10.1080/03093640008726549 Buy Metrics Abstract Rollover shape is introduced as a significant characteristic of prosthetic feet. The rollover shapes of the Flexwalk, Quantum, SACH, and SAFE prosthetic feet were determined using three methods; two involving quasistatic loading and one dynamic loading. The results show that foot rollover shape properties obtained by quasistatic and by dynamic methods are similar. Relationships between foot rollover shape and the alignment of transtibial prostheses are introduced that suggest ways to align transtibial prostheses without walking trials and iterations. The relationships may explain what prosthetists attempt to accomplish when they dynamically align a transtibial limb. They also explain why prosthetic feet with different mechanical properties usually necessitate different alignments, and may explain why a number of gait studies of transtibial amputees do not show major gait differences when walking is executed on various kinds of prosthetic feet. © International Society for Prosthetics and Orthotics 2000.