A system for use in conjunction with a hip prosthesis is shown. A customized patient-specific acetabular orthopedic surgical instrument and a customized patient-specific femoral orthopedic surgical instrument are disclosed. A method for fabricating and using the orthopedic surgical instruments is also disclosed. A method for using the customized patient-specific acetabular orthopedic surgical instrument is disclosed. A method for using the customized patient-specific femoral orthopedic surgical instrument is disclosed.