Preserving Shoulder Health and Preventing Repetitive Strain Injury with the Empulse M90 Power Assist Zac was injured in a car accident when he was 19 years old, resulting in an incomplete C 5-6 spinal cord injury. Now in his 30s, Zac has been using a manual wheelchair and states that he feels the stress on his shoulders when he is rolling up a ramp or moving over rough terrain. 2025-11-13 Keep Reading