Titanium prostheses coated with hydroxyapatite (HAp) provide a biocompatible surface for interaction with bone tissue. Recent studies demonstrated that the bone surface has an electrical potential that influences attachment of osteoblastic cells to the bone. Therefore, the HAp surface could benefit from an electric potential equal to bone. This could be achieved with HAp flame deposition, where HAp particles are molten and accelerated towards the substrate. An electric field is directed onto the coating while injecting water vapor to impart an electric field on the surface of the HAp layer. The research study reports on the electrical potential formed on the surface after such processing.