Table 6 Studies on DTI in transtibial prosthetic users using analytical modelling
From: Exploring the role of transtibial prosthetic use in deep tissue injury development: a scoping review
Author and year | Type of study | Methodology | Input data | Assumptions | Outcome measures |
|---|---|---|---|---|---|
Portnoy et al. 2007 [37] | In Silico Study | - Application of Hertz contact theory for calculation of contact pressure between bone and soft tissue - Evaluation of sensitivity of pressure calculations to tibial radius, muscle thickness and mechanical properties | - Tissue morphology (X-Ray [29]) - Poisson’s ratio (literature) | - Soft tissue: isotropic, homogeneous, linear elastic - No friction between bone and soft tissue - Tibia simplified as flat-ended cylinder - Only vertical bone displacement | Contact pressure between tibia and soft tissue |
Portnoy et al. 2010 [31] | Experimental Study | - Development of portable monitor based on an axi-symmetric indentation problem - Use of monitor on 18 TTAa s to record internal loads during walking on complex terrain - Comparison of internal loads between patient groups and surfaces | - Interface pressure (pressure sensor) - Tissue morphology (X-Rays) - Shear modulus, friction between skin and socket (literature) | - Soft tissue: isotropic, homogeneous, linear elastic - No differentiation between muscle, fat, and skin - Tibia simplified as flat-ended cylinder | Average von Mises stress, loading rate, stress-time integral |
Portnoy et al. 2012 [32] | Experimental Study | - Use of portable pressure monitor [31] on 10 TTAs - Assessment of internal stress during walking on complex terrain - Comparison of outcomes for ESRb foot and hydraulic foot | - See Portnoy et al. 2010 | - See Portnoy et al. 2010 | Average von Mises stress, RMSc of von Mises, loading rate, cadence |