Northwestern University Feinberg School of Medicine

Northwestern University Prosthetics-Orthotics Center

Further Development and Evaluation of the Junior Shape&Roll Prosthetic Foot

Co-Investigators: Edward Grahn, BSME, Dilip Thaker, Kerice-Ahmun Tucker, William Brett Johnson, PhD

Funded by: National Institute on Disability and Rehabilitation Research (NIDRR)

Status: Completed

Introduction

There are few prosthetic foot options for children with lower limb loss. In low-income areas, there are even fewer options. At the NU-RERC State-of-the-Science Conference in P&O conducted in 2006, Don Shurr, CPO, PT, stated that there are many adult feet, but few "little feet". Also, Mr. Shurr pointed out that it is not clear how prosthetic feet should change as children grow. Our previous RERC-funded studies of roll-over shape led to the development of the Shape&Roll Prosthetic Foot for adults in resource-limited areas. Based on the need for highly functional but low-cost pediatric prosthetic feet around the world, we are continuing our development of the Junior Shape&Roll Prosthetic Foot. During the last cycle of RERC funding, we collected important information on able-bodied children walking that will allow us to build low-cost but biomimetic prosthetic feet for children. Based on the information collected during the last RERC cycle, we have started developing the Junior Shape&Roll Prosthetic Foot. In this work, we finalized the designs for the Junior Shape&Roll Prosthetic Foot (sizes 11cm to 21cm) and disseminated information about how to fabricate it.

Specific Objectives

The objectives of this project are: (1) to finalize the design of the Junior Shape&Roll Prosthetic Foot (sizes 11 to 21 cm); (2) to ensure structural integrity of the feet using mechanical testing machines (modeled after the International Organization of Standardization's document on structural testing of prostheses - ISO 10328); (3) to gather subjective feedback and gait measurements from a small group of pediatric prosthetic foot users; and (4) to transfer the technology to a prosthetics manufacturing company.

Results

The design, fabrication and preliminary mechanical testing of the Shape&Roll Foot Jr. is described in a fabrication manual

Clinical Implications

Low-cost prosthetic components are especially relevant to the pediatric amputee population because they need to be continuously replaced as the child grows. The successful completion of this project will lead to a low-cost yet highly functional and biomimetic pediatric prosthetic ankle-foot system.

Patent Granted

Hansen A, Childress DS (2010) Prosthetic foot with adjustable flat region. Patent application #US20100030344 A1. https://www.google.com/patents/US20100030344?dq=Prosthetic+foot+with+adjustable+flat+region&hl=en&sa=X&ei=haqRVMHCB46nyASZooLIAw&ved=0CB8Q6AEwAA

Publications

Tucker K, Johnson WB, Gard S, Fatone S (2014) Fabrication Manual: Shape&Roll Prosthetic Foot Jr. Rehabilitation Engineering Research Center for Prosthetics and Orthotics, Northwestern University Prosthetics-Orthotics Center, Chicago, IL.