The basic design of the twinSys stem system is based on the straight-stem prosthesis concept by Prof. Maurice E. Müller. The twinSys system has been distributed since 2003 with the aim of enabling surgeons to perform cemented and uncemented implan-tation with a single instrumentation.
The cemented twinSys stem is a straight monoblock prosthesis available in both Standard and Lateral versions. In relation to the rasp, the stem is under-dimensioned by 1 mm per side, offering sufficient space for a homogenous cement mantle.
The rounded, rectangular cross-section gives the implant its stability against rotational forces acting on it. According to the French philosophy of combining a highly polished stem with a thin cement mantle («composite beam»), no centring aid is necessary.1, 2
The triply conical stem geometry transforms the shear forces into compressive forces and allows wedging of the stem in the cement mantle, thereby minimising the risk of postoperative subsidence.3 By absorbing micro-movements between the implant and the cement mantle, the highly polished surface reduces the risk of prosthesis loosening.1, 2
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