Abstract: An orthopedic angular measuring device including an elongated shaft having a longitudinal axis and configured for attachment to a bone engaging member, at least one marker associated with the shaft which is intraoperatively visible to determine the position or orientation of the bone engaging member relative to an image as the device is displaced relative to an angle or orientation. In one embodiment, the angular measure device is configured to attach to an acetabular cup for insertion of the cup into a patient's hip or acetabulum.