Final answer:
The most appropriate protocol for a 5-year-old client after a flexor tendon repair is the fabrication of an orthosis.
Step-by-step explanation:
The most appropriate protocol for a 5-year-old client after a flexor tendon repair would be the fabrication of an orthosis. An orthosis is a device used to support and stabilize the affected area. In this case, an orthosis for the hand, wrist, and forearm would assist in bending the hand up toward the shoulder, tilting the hand to the side away from the body, stabilizing the wrist, and bending the fingers to make a fist.