| Device Requirement | Verification Activity |
| 1. Device will operate under a maximum angular velocity for the knee joint corresponding to specific gait velocities | Goniometer will be used to measure positions at each angle. Video recording will record the angular position over time. Angular velocity will be calculated from these values. |
| 2.1 Device must provide resistance during active flexion 2.2 Device must provide assistance during active extension | Mathematical model of the force vector at the point of insertion below the knee to resolve torque |
| 3. Device must allow normative knee joint angles for the four phases of walking gait | Use a goniometer to measure knee angles at maximum extension and flexion |
| 4. Must accommodate the middle 90% of adults 60 years old and up | Measure the maximum and minimum distance between the top and bottom sections of the device using a flexible tape measure. Measure the maximum and minimum circumference at each section with straps using a flexible tape measure. |
