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