Methods and devices for providing electromagnetic field treatment to a subject having a metal-containing implant or prosthesis at or near the treatment site. These treatment methods can include calibrating the treatment devices such that the treatment field provided is not distorted or affected by the presence of metal in the target location. Additionally, embodiments of the invention provide for wearable and adjustable electromagnetic treatment devices with reinforcing support members to maintain the structure of flexible metal applicators, which generate the therapeutic electromagnetic field.