Hip stem alignment guide

A prosthesis system, comprising:

• a trial prosthesis having a stem and a neck;
• a joint prosthesis having a stem and a neck;
• and
• a prosthesis alignment guide having a guide body, an alignment member, and a locking member, the guide body connectable to the respective necks of the trial prosthesis and joint prosthesis and having an alignment hole extending therethrough, the alignment member being slidably disposed within the alignment hole so that a first end thereof extends from the guide body, and the locking member being engaged to the guide body and moveable from a first position in which the locking member is disengaged from the alignment member and a second position in which the locking member engages the alignment member and secures it from slidable movement within the alignment hole,
• wherein when either the trial prosthesis or the joint prosthesis is implanted in a bone and the guide body is connected to a respective neck, the alignment member disposed through the alignment hole defines an axis that intersects a marking on the bone.

A method for aligning a hip prosthesis relative to a femur, comprising:

• inserting a prosthesis trial into a femur;
• pointing to a target location with an alignment member of an alignment guide mounted to a trunnion of the prosthesis trial;
• transferring the alignment guide to a trunnion of a joint prosthesis;
• inserting the joint prosthesis into the femur;
• and
• adjusting the position and orientation of the joint prosthesis within the femur until the alignment member of the alignment guide points to the target location.