Nowadays, total hip replacement represents the most common orthopaedic surgery performed to restore proper functioning of the hip joint in patients affected by chronic hip pain and disability. There are different available prosthesis designs, from those that replace only the proximal femoral bone (endoprosthesis) to those that replace the entire joint (arthroprosthesis) and, by exploiting the modularity of the implant, it is possible to choose the prosthesis that best matches the patient's anatomy, age, weight and level of activity. Modular prostheses present issues related to the establishment of relative micromotions between coupled components, which can lead to the failure of the implant due to wear of contacting surfaces at the junction (i.e., trunnionosis) and, consequently, to the need for revision surgery.