Article

Finite element analysis has been universally employed for the stress
and strain analysis in lower extremity prosthetics. The socket adapter was the
principal subject of interest due to its importance in deciding the knee motion
range. This article focused on the static and dynamic stress analysis
of the designed hybrid adapter developed by the authors. A standard mechanical
design validation approach using von Mises was followed. Four materials were
considered for the analysis, namely, carbon fiber, oil-filled nylon, Al-6061, and
mild steel. STUDY DESIGN: The paper analyses the static and dynamic stress on
designed hybrid adapter which incorporates features of conventional male and
female socket adapters. The finite element analysis was carried out for possible
different angles of knee flexion simulating static and dynamic gait situation.
METHODS: Research was carried out on available design of socket adapter.
Mechanical design of hybrid adapter was conceptualized and a CAD model was
generated using Inventor modelling software. Static and dynamic stress analysis
was carried out on different materials for optimization. RESULTS: The finite
element analysis was carried out on the software Autodesk Inventor Professional
Ver. 2011. The peak value of von Mises stress occurred in the neck region of the
adapter and in the lower face region at rod eye-adapter junction in static and
dynamic analyses, respectively. CONCLUSIONS: Oil-filled nylon was found to be the
best material among the four with respect to strength, weight, and cost. CLINICAL
RELEVANCE: Research investigations on newer materials for development of improved
prosthesis will immensely benefit the amputees. The study analyze the static and
dynamic stress on the knee joint adapter to provide better material used for
hybrid design of adapter.
CI - (c) The International Society for Prosthetics and Orthotics 2013.

Langue : ANGLAIS