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Research Papers

Design and Preliminary Evaluation of a Novel Brace for Boutonniere Deformity

[+] Author and Article Information
Mark E. Rentschler

 University of Colorado, Boulder, CO 80309-0427mark.rentschler@colorado.edu

Scott A. Macdonald

 University of Colorado, Boulder, CO 80309-0427

J. Med. Devices 4(2), 021002 (Aug 04, 2010) (7 pages) doi:10.1115/1.4001862 History: Received November 07, 2009; Revised May 04, 2010; Published August 04, 2010; Online August 04, 2010

Boutonniere deformities are a common injury to the extensor mechanism of the finger. The deformity results in fixed contraction in the middle finger joint and is severely debilitating to functionality. Due to the complexity of the extensor mechanism, surgical repair is difficult, which usually requires multiple procedures, and in some cases is unsuccessful. Nonsurgical treatment of the deformity has not dramatically improved in many years and usually requires long-term use of braces and physical therapy. This work is focused on design and preliminary evaluation of an improved boutonniere brace to correct the deformity with emphasis on lower costs, integrating therapeutic techniques such as heat and motion to increase blood flow and patient comfort. A review of the current state of the art is presented along with the design approach used to develop an improved device. Experimental test results are also presented. This work demonstrates a new device and approach for treatment of boutonniere deformities that may translate to treatment of other conditions such as arthritis.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

X-ray taken after injury that indicates onset of boutonniere deformity

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Figure 2

Anatomy of the finger before (top) and after boutonniere deformity (bottom)

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Figure 3

The DeRoyal LMB spring finger extension assist (20) brace during use (top) and the Joint-Jack (19) brace during use (bottom)

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Figure 4

Isometric view of the candidate IBB design

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Figure 5

Top view (top) and side view (bottom) of IBB during use

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Figure 6

Electronic circuit diagram for the IBB therapy system

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Figure 7

Side view of the IBB design with modeled finger included

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Figure 8

IBB and finger free-body diagrams

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