Hip arthroplasty apparatus and methods are described to determine an orientation of an acetabular cup impactor the acetabular cup impactor being moveable to a desired orientation relative to a patient s pelvic region for implantation of an acetabular cup. In one embodiment an electronic orientation sensor is transitionable between a first location on the patient s pelvic region and a second location on the acetabular cup impactor. In a second embodiment an image capture device is locatable on the acetabular impactor or the patient s pelvic region to capture images including markers located on the other of the patient s pelvic region or the acetabular impactor.
