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The design of the CR stem system embarks consequently on the principle of the proximal force transmission. The cementless implant consists of a titanium casting alloy (TiA6V4). The microporous surface structure in the proximal area (pore size: 100 µm) and the compression flanks (principle of the collar without collar) allow the proximal force transmission. The cross profile of the stem guarantees a high rotation safety. The cemented stem implant consists of a CoCrMo casting alloy, is high-polished and has got a distal PMMA centraliser. Both versions can be implanted by the use of the same instruments. Planning a cementless implantation you use the stem that corresponds to the size of the previously used rasp, planning a cemented implantation you use the stem of one size smaller.