Acetabular spacer device (1), of the temporary and disposable type, adapted to be implanted in use in a bone cavity placed at a joint of the human body, such as a hip or shoulder j oint, wherein the acetabular spacer device (1) has a cup-like shape, substantially hemispherical, and comprises a first convex surface (2), adapted to be positioned at the bone cavity, a second concave surface (3) which defines a cavity (7), wherein the acetabular spacer device (1) comprises at least one pharmaceutical or medical substance, such as for example at least one antibiotic, adapted to treat during use an ongoing infection in the bone cavity.