Since its creation in 1977, the Original M.E. Müller Straight Stem prosthesis has remained essentially unchanged; very good 20-year results confirm its well-founded concept. In only 26 years (1977–2003), the Original M.E. Müller Straight Stem had been implanted over a million times around the world.
The fluted structure of the stem, with the two particularly marked longitudinal grooves A/P in the stem axis, enables very good cement adhesion. The small proximal collar serves to compress the cement, prevents the stem from sinking into the cement, and, together with the fine-blasted surface of the Straight Stem, it achieves a very stable anchorage of the implant. (https://www.zimmerbiomet.com/)