1. Individual Project Update
January 18, 2005
Design of a Rotational Stability Measurement Device Stephanie Bechtold Katie Dillon, Kara Wagner Mentor: Thore Zantop, M.D.

2. 50,000 ACL reconstructions per year Debate over best method
Motivation
50,000 ACL reconstructions per year
Debate over best method
Single vs. double bundle
Evaluation currently only done in one plane
AP translation vs. axial rotation

3. Goals
Design a measurement device to accurately measure axial rotation of the knee
Fabricate prototype
Validate prototype
Create a set of baseline data

4. Aircast® Pneumatic Walker brace
Resources
Aircast® Pneumatic Walker brace
Nest of Birds Ascension Technology Corporation, Burlington, VT/USA
Universal force-moment sensor (JR3, Woodland, California)

5. Force applied to brace via UFS Sensor Position? Patient Position?
Previous Designs
Force applied to brace via UFS
Sensor Position?
Patient Position?

6. Design and build ergonomic leg rest Test sensor placement reliability
Work to be done
Design and build ergonomic leg rest
Test sensor placement reliability
Number of sensors
Repeatability of measurement
Which sensor is most reliable?
Develop Matlab code for data collection
Complete by end of this week
Preliminary testing of sensor placement to begin 1/20/05