Use Instructions

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The CTE has the capability to store up to 30 days of data in memory. If the data contained in the
CTE’s memory cannot be transmitted to the Cloud due to connectivity issues with a Base Station
and the implant has reached its memory limit, new data will overwrite the oldest data first. In
this scenario, data will be lost. The Home Base Station can store up to 45 days of transmitted
data if it is not able to connect to the Cloud but is still able to communicate with the implant
locally.
10.2. Canary Medical Gait Parameters Data Characteristics
The CTE collects raw sensor data that is transferred through a Base Station to the Cloud where it
is processed to generate the Canary Medical Gait Parameters listed in Table 5. These gait
parameters summarize activity metrics for the clinician after a patient undergoes TKA surgery.
The intent of the data is to provide information which is accessible to both the patient and their
clinician and to facilitate the delivery of healthcare to the patient by the clinician.
Table 5: Canary Medical Gait Parameters
Parameter Description Units
Walking Speed
Mean sagittal plane distance walked per unit
time. Directly calculated from cadence and
stride length for each gait cycle.
meters per
second/s
Cadence
Mean steps per minute. Derived from two
consecutive peak angular velocities.
steps per minute
Stride length Mean distance traveled during one gait cycle. meters
Knee ROM
Mean sagittal plane functional knee joint range
of motion. Difference between maximum and
minimum knee joint flexion.
degrees
Tibia ROM
Mean sagittal plane range of motion of the tibia
with respect to the floor. Difference between
the minimum and maximum tibia to floor angle.
degrees
Step Count Number of steps taken during a Sampling Day. steps
Physician Instructions for Use
DRAFT