Open AccessStanding interface stresses as a predictor of walking interface stresses in the trans-tibial prosthesis
Author(s) -
Santosh G. Zachariah,
Joan E. Sanders
Publication year - 2001
Publication title -
prosthetics and orthotics international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.729
H-Index - 52
eISSN - 1746-1553
pISSN - 0309-3646
DOI - 10.1080/03093640108726566
Subject(s) - sagittal plane , tibia , shear stress , materials science , weight bearing , stress (linguistics) , structural engineering , orthodontics , anatomy , composite material , medicine , surgery , engineering , linguistics , philosophy
Interface pressures and shear stresses within the socket, in standing and walking, were measured for two unilateral, male, trans-tibial amputee subjects, during two sessions each. The ratios of equal weight-bearing standing stresses to peak walking stresses showed regional variation, ranging from 0.24:1 for pressure over the anterior region to 1.01:1 for resultant interface shear stress over the lateral region. Interface stresses in standing were only moderate predictors of peak walking stresses. The best correlation coefficient between standing in full weight-bearing and peak walking stress was 0.88 for pressure over the lateral region. As the amputees progressed from minimal to full weight-bearing in standing, and then to walking, the interface stresses increased in a nonlinear fashion, consistent with the assumption that the anterior tibia provides much resistance to the bending moment in the sagittal plane during walking.