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Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis

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Engineering a trans-tibial prosthetic socket for the lower limb amputee.

Sheridan Laing¹, Peter Vs Lee, James Ch Goh

¹Department of Mechanical Engineering, Melbourne School of Engineering, University of Melbourne, Australia.

Annals of the Academy of Medicine, Singapore

|June 17, 2011

Summary

Pressure casting offers a promising alternative to traditional patella-tendon bearing (PTB) sockets for trans-tibial amputees, potentially improving stump/socket interface pressure and comfort. Further research is needed to fully understand its biomechanical principles.

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Area of Science:

Biomedical Engineering
Prosthetics and Orthotics

Background:

Review of prosthetic socket designs for trans-tibial amputees, focusing on patella-tendon bearing (PTB) and pressure casting techniques.
Examination of the underlying biomechanics, clinical implications, and current state of trans-tibial socket technology.

Purpose of the Study:

To compare the theory, biomechanics, and clinical outcomes of PTB sockets versus pressure casting techniques.
To address methods for examining and comparing different prosthetic socket designs.

Main Methods:

Systematic review of journal papers over 50 years focusing on trans-tibial socket design.
Analysis of clinical significance and evolution of knowledge in the field.

Main Results:

Traditional PTB socket engineering relies on unproven empirical derivations and biomechanical theory.
Pressure casting techniques, based on hydrostatic theory, offer a more uniform stump/socket interface pressure.

Conclusions:

Pressure casting shows potential for creating comfortable trans-tibial prosthetic sockets, serving as an alternative to PTB designs.
Further quantitative biomechanical studies, including gait analysis and interface pressure measurements, are necessary to validate pressure casting theory.