Sensors

• 6 degrees of freedom

  • 3 axis accelerometer

    • Calculates linear rate of change

  • 3 axis gyroscope

    • Calculates angular rate of change

  • No magnetometer

    • Cannot calculate yaw

• X-Rotation: Pitch

• Y-Rotation: Roll

• Z-Rotation: Yaw

Sensor is oriented on the patient so the +Z axis points away from the front of the patient and the +Y axis points up from the ground.

• X-Rotation: flexion and extension

• Y-Rotation: internal and external rotation

• Z-Rotation: abduction and adduction

In order to calculate the rotation of the leg, we need to use the intrinsic axis. A rotation matrix was implemented to calculate the value. However, because our sensor only calculates Pitch and Roll, we could not use this method to accurately measure rotation of the leg.

Experimental data was used to evaluate rotation values at different pitch levels. More to show in the studies and results section.