An orthopedic device comprising: an acetabular guide (100, 200) including: a patient-specific engagement surface (108, 208) designed to be complementary and mateable with a corresponding surface of the patient's pelvic anatomy as determined during a pre-operative plan of the patient by a three-dimensional reconstruction of the anatomy of the patient using two-dimensional medical images, the patient-specific engagement surface having a first portion mateable with a portion of an acetabulum of the patient; a guiding element (104, 204) extending from the acetabular guide (100, 200) opposite to the first portion of engagement surface, the guiding element (104, 204) defining a bore (106, 206) designed to be oriented along an alignment axis for an acetabular implant when the acetabular guide (100, 200) is engaged to the acetabulum; and first and second marker elements extending from a portion of the acetabular guide (100, 200) outside the acetabulum of the patient, the marker elements defining corresponding first and second bores for guiding first and second marker pins into a bone portion of the patient; characterised in that the orthopedic device further comprises a secondary guide designed during the pre-operative plan to include first and second secondary marker elements complementary to the first and second marker elements of the acetabular guide (100, 200) for receiving the first and second marker pins when the first and second marker pins are attached to a bone portion of the patient. an acetabular guide (100, 200) including: a patient-specific engagement surface (108, 208) designed to be complementary and mateable with a corresponding surface of the patient's pelvic anatomy as determined during a pre-operative plan of the patient by a three-dimensional reconstruction of the anatomy of the patient using two-dimensional medical images, the patient-specific engagement surface having a first portion mateable with a portion of an acetabulum of the patient; a guiding element (104, 204) extending from the acetabular guide (100, 200) opposite to the first portion of engagement surface, the guiding element (104, 204) defining a bore (106, 206) designed to be oriented along an alignment axis for an acetabular implant when the acetabular guide (100, 200) is engaged to the acetabulum; and first and second marker elements extending from a portion of the acetabular guide (100, 200) outside the acetabulum of the patient, the marker elements defining corresponding first and second bores for guiding first and second marker pins into a bone portion of the patient; characterised in that the orthopedic device further comprises a secondary guide designed during the pre-operative plan to include first and second secondary marker elements complementary to the first and second marker elements of the acetabular guide (100, 200) for receiving the first and second marker pins when the first and second marker pins are attached to a bone portion of the patient. a patient-specific engagement surface (108, 208) designed to be complementary and mateable with a corresponding surface of the patient's pelvic anatomy as determined during a pre-operative plan of the patient by a three-dimensional reconstruction of the anatomy of the patient using two-dimensional medical images, the patient-specific engagement surface having a first portion mateable with a portion of an acetabulum of the patient; a guiding element (104, 204) extending from the acetabular guide (100, 200) opposite to the first portion of engagement surface, the guiding element (104, 204) defining a bore (106, 206) designed to be oriented along an alignment axis for an acetabular implant when the acetabular guide (100, 200) is engaged to the acetabulum; and first and second marker elements extending from a portion of the acetabular guide (100, 200) outside the acetabulum of the patient, the marker elements defining corresponding first and second bores for guiding first and second marker pins into a bone portion of the patient; characterised in that the orthopedic device further comprises a secondary guide designed during the pre-operative plan to include first and second secondary marker elements complementary to the first and second marker elements of the acetabular guide (100, 200) for receiving the first and second marker pins when the first and second marker pins are attached to a bone portion of the patient.