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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 yearType of studyMethodologyInput dataAssumptionsOutcome 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. 2010Average von Mises stress, RMSc of von Mises, loading rate, cadence
  1. a Transtibial amputee; b Energy Storage and Return; c Root mean square