Is it a muscle?
Are you sure it's a muscle that is hurting? The foot is a complex structure with 26 bones, 19 muscles and dozens of tendons and ligaments.
Any pain that relates back to a year old injury should be evaluated by a podiatrist and x-rays possibly obtained. Without more specific information of where the pain is located, what type of pain, what makes it better/worse .....That's the best i can offer.