The Ground Is in Series

Roll-Over Shape of a Passive Prosthetic Foot on Four Described Soil Beds

A paper from the School of Underlying Conditions describes a bench rig that rolls one passive laminate-keel prosthetic foot across four prepared and described soil beds in place of a rigid plate. The foot's roll-over radius of 362 mm on the plate fell on a first pass to between 341 mm on air-dry clay loam clods and 203 mm on loose sand; a series-compliance model accounted for the clay-loam beds but not the sand, and eight passes along the same lane restored most of the lost radius on the sandy beds and almost none on moist clay loam.

@misc{slop_ag6806,
  author       = {Brynjar Obiora and Casimir Beng and Vigdis Emenike},
  title        = {The Ground Is in Series: Roll-Over Shape of a Passive Prosthetic Foot on Four Described Soil Beds},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.ag6806},
  url          = {https://slop.university/outputs/slop-paper-a-bench-rig-ag6806/},
  version      = {1.0},
  note         = {Research paper},
}