M.E.Müller™ Straight Stem
History
There are few implants that have made history and are still used to this
day. The Original Müller Straight Stem prosthesis falls into this category.
It was created by Professor M. E. Müller who, together with Sir John
Charnley, has not only left his mark on the whole field of hip replacement,
but made it possible in the first place.
Design Rationale
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.
Biomechanical Concept
Optimum adaptation
- Increases rigidity
- Decreases stress peaks
- Less micromotion
- Positive contact in the frontal plane
- Additional interlocking is often achieved in the sagital plane by the curvature of the femur
Dual fixation
- Selfinterlocking as a anchoring principle
- Bone cement only as a filling
MEM Features
Lateral and Standard version
For more than 20 years, the Straight Stem prosthesis has been available with an additional offset option, the lateralized Straight Stem prosthesis.
The lateralized Straight Stem prosthesis, with its 8 mm larger offset (neck displaced by 8 mm in medial direction) results in a lateralization of the femur. It is used for patients in whom the implantation of a standard version would result in an undesired medialization of the femur.
This modern concept allows reconstruction of the anatomical conditions.
Different offsets provide:
- possibility to adjust leg axis
- intraoperative options
More than 1,000,000 Original Müller Straight Stems have been implanted around the world.
