Standing interface stresses as a predictor of walking interface stresses in the trans-tibial prosthesis.
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.
Zachariah
S G
SG
Departments of Bioengineering and Rehabilitation Medicine, University of Washington, Seattle, USA.
Sanders
J E
JE
D000328:Adult; D000671:Amputation, Surgical / Q000379:methods* / Q000534:rehabilitation*; D001186:Artificial Limbs; D001696:Biomechanical Phenomena; D005684:Gait; D006801:Humans; D007866:Leg; D008297:Male; D011187:Posture; D011237:Predictive Value of Tests; D011312:Pressure; D011474:Prosthesis Design; D017755:Prosthesis Fitting; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D013977:Tibia / Q000601:surgery*; D016138:Walking / Q000502:physiology; D016474:Weight-Bearing