Dual mobility is a concept well-known by orthopedic surgeons in France. The prosthetic head is mobile in a retentive polyethylene liner which remains free in a metal cup.
Under CHARNLEY’s « low friction » principle, the small articulation begins to move until the femoral neck mobilizes the polyethylene component in the large articulation.
The implant stability is guaranteed by the large diameter of the femoral head, close to the anatomy.
This concept induces a contact with the free edge of the femoral stem. This acts as the 3rd articulation, as described by Dr Daniel NOYER.
Therefore, this is a “dual mobility cup with 3 articulations”.