A set of instruments for theimplantation of an acetabular prosthesis(100), comprises at least one tool (1 2) designedto operate in the acetabular cavity(101) of a patient and at least one emitter(3) jointly associable with said tool anddesigned to emit a control signal (31 ) tobe aligned with a reference signal (30)which identifies a correct orientation ofsaid tool (1 2) relative to the acetabularcavity (101).