Aiming device having radio opaque markers

摘要

An aiming arm (106) can include at least a pair of radiographic markers (160) that define a first radiographic image characteristic when a radiographic image source is not adequately aligned with the aiming arm and a second desired radiographic image characteristic when the radiographic image source is adequately aligned with the aiming arm. Once the radiographic image source has been aligned with the aiming arm the position of the aiming arm relative to an underlying implant can be visually inspected to determine whether the aiming arm is aligned with the underlying implant.