The concept of double mobility was developed by Prof. Gilles Bousquet in 1975 with the aim of treating habitual hip luxation.13 The system consists of a metal casing with a highly polished internal surface and a movable polyethylene inlay, in which a press-fitted prosthesis head moves. This provides a greater range of motion with less abrasion14, 15, 16 and reduced risk of luxation.15, 17, 18 It was on the basis of this principle that the BiMobile Acetabular Cup System came about.
The development of the bimobile acetabular cup system drew on many years of experience with successful implant systems and fixation concepts plus state-of-the-art material and coating technologies. The result is the versatile BiMobile Acetabular Cup System.
The cementless BiMobile Acetabular Cup is available with a TiCaP double coating. The TiCaP double coating combines the properties of a highly porous layer of pure titanium for primary fixation and calcium phosphate coating, which together provide optimal primary and secondary implant stability.4, 5 A special macrostructure on the cup equator increases primary stability.9
The BiMobile Dual Mobility System is available in two versions, either cemented or cementless. The metal casings in both versions are fabricated from biocompatible, sturdy EndoDur CoCrMo material.1, 2 The inner surface is highly polished in order to minimize wear.
The cemented BiMobile Acetabular Cup has a finely matt-finished SatinLink surface, which is also a feature of the SP II stems. Latitudinal and longitudinal groove-like structures reinforce the fixation and allow air to escape when the implant is pressed into the cement bed.
The UHWMPE inlay can be combined with LINK prosthesis heads made of CoCrMo or ceramic with a 22 mm or 28 mm diameter.