Non-cemented hip stem based on design principles by Prof. Dr. K. Zweymüller

The Z-Stem™ prosthesis stem is a non-cemented hip endoprosthesis made of TiAl6V4 ELI (ISO 5832-3). The prosthesis has a double-tapered shape and a rectangular cross-section. The design of this non-cemented stem is based on the principles of biological cortical anchorage, as described by Prof. Dr. K. Zweymüller. This stem design has been in clinical use for more than 30 years.

With its conical shape and rectangular cross-section, the stem wedges epiphyseally and diaphyseally, thus establishing direct primary stability. The Z-Stem™ Prosthesis Stem can be used in both primary care and revisions.

Properties / technical data

  • Rotational stability thanks to its rectangular cross-section
  • The rough surface allows excellent integration of the stem into bone structure
  • The 12/14 stem taper corresponds to Merete taper specifications and can be combined with the BioBall™ system or Merete heads, i.e. metal heads with Merete GmbH XPE inlays and BIOLOX® delta* ceramic heads with BIOLOX® delta* inlays or XPE inlays
  • Non-cemented anchoring
  • Available in 14 different sizes as a standard variant with a 131° CCD angle or as a lateral variant with a 123° CCD angle
  • Material: TiAl6V4 ELI alloy

*BIOLOX® delta is a registered trademark of CeramTec GmbH.


  • Advanced wear of the hip joint due to degenerative, post-traumatic or rheumatic diseases, including advanced avascular necrosis of the femoral head, which cannot be treated using conservative or joint-preserving surgical procedures
  • Revisions of previous surgeries (rejection of total hip endoprosthesis, hemiarthroplasty or osteosynthetic treatment of a fracture near the femoral head and osteotomies near the hip joint)
  • Hemiarthroplasty with unpromising femoral neck fractures to be treated by osteosynthesis

Media library

Click here for current information on the Z-Stem™ hip stem. Please do not hesitate to contact Customer Service for additional information.

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