Final answer:
After a right BKA, if a client complains of pain in the right toe, they are experiencing phantom limb pain, which occurs due to continued brain reception of nerve signals from the amputated limb.
Step-by-step explanation:
If after a right below-knee amputation (BKA), the client complains of pain in his right toe, he is experiencing phantom limb pain. Phantom limb pain is a phenomenon where individuals perceive sensations, often painful, in the limb that has been amputated. This happens because the brain continues to receive signals from nerves that originally carried impulses from the missing limb, a form of neural activity that can cause the sensation of pain in a part of the body that no longer exists.