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Basic principles and uniform terminology for the head-neck junction in hip replacement.

Paul H Werner1, Harmen B Ettema, Florian Witt

  • 11 Isala Hospital, Department of Orthopaedic Surgery and Traumatology, Zwolle - The Netherlands.

Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
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Summary

Metal-on-metal hip replacement issues highlight the need for clear terminology. This review proposes "male taper" and "female taper" for the head-stem junction to improve understanding of hip implant locking mechanisms.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Materials Science

Background:

  • Recent failures in large head metal-on-metal hip replacements have increased focus on the head-neck junction.
  • Understanding the locking mechanism, assembly, and strength factors of this junction is crucial.

Purpose of the Study:

  • To review and catalog the varied terminology used for the hip replacement head-stem junction.
  • To propose a standardized terminology for improved clarity and consistency.

Main Methods:

  • A systematic literature review was conducted following PRISMA guidelines.
  • Independent searches of PubMed, CINAHL, and MEDLINE databases were performed.
  • 53 articles were included from an initial search of 518.

Main Results:

  • No established consensus on uniform terminology for the head-stem junction was identified.
  • Significant variability exists in taper designs and naming conventions across manufacturers.

Conclusions:

  • A uniform terminology is essential to simplify the complex issue of hip implant junctions.
  • "Male taper" (for the stem) and "female taper" (for the head) are proposed as standardized terms.
  • Understanding assembly techniques and locking principles remains critical for hip implant success.