1. Development of Device to Analyze the Motion of the Knee
Biomedical Engineers:
Tera George
Kelly Braun
Advisor: Dr. John Dawson
Orthopaedics

2. Specific Goal of Our Project
Design, build and test a device which will hold the femur of a dog and allow unconstrained motion of the knee joint.
Analyze this motion to determine the difference in movement between injured and non-injured knees.
Apply this knowledge to develop a similar method of testing knee joints in humans.

3. Anatomy and Physiology of the Knee
Bones: patella, femur, tibia, fibula
Four main ligaments
Patellar Tendon
Six degrees of motion

4. Current Methods of Knee Testing
Lachman’s Test
Anterior Drawer Test
Hopping Test (Unilateral)
Bilateral Running Test
MRI, not required, often overused
Through history and physical exam of patient cited at: Grand Rounds at Froedtert Hospital

5. Previous Work Literary search completed
Dissected and stored legs for testing
Learned about the relationships of the knee between the ligaments, tendons, bones.
Sketched and ordered parts for our device
Determined dimensions of device to be built

6. Designing Factors Able to hold onto quad muscle
High enough for tibia/fibula to swing without hitting the ground
Sturdiness
Easily wiped off
Allow for full 6 degrees of movement
Allow for various sizes of dog

7. Current Work Ordered and received our parts last Thursday
Are waiting to get into the machinist shop to cut the aluminum down to size (hopefully today)
Will build our device

8. Device Dimensions Device: Width/Length 12 inches Height 18 inches
Range of Dogs Legs: Approximately inches from femur head to end of tibia
Ability to hold dog’s legs of all lengths because of the use of a pipe

9. Engineering Discussion
Materials: Aluminum Tubing Nylon Steel Flats/Corners
Sturdy
Adjustable to user’s needs, ie more pipe clamps, varied height for varied lengths of legs

10. Future Work Complete building Test dog’s legs in our device
Gather more dog’s legs
Analyze the results and determine what the differences in movement are between injured and non-injured knees