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Related Experiment Videos

How close does an uncemented hip stem match the final rasp position?

Marco Barink1, Hjalmar Meijers, Maarten Spruit

  • 1Orthopaedic Research Laboratory, University Medical Centre Nijmegen, Nijmegen, The Netherlands.

Acta Orthopaedica Belgica
|January 27, 2005
PubMed
Summary

The final position of cementless hip implants may differ slightly from the trial rasp position. This study found minimal, clinically insignificant differences for the CLS and CBC-T systems, suggesting reliable implant placement in total hip arthroplasty.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Implant Design

Background:

  • Accurate implant positioning is crucial for successful total hip arthroplasty (THA).
  • Variability in the final position of cementless stems, like the CLS system, compared to the trial rasp has been observed.
  • Understanding rasp-stem correspondence is essential for predicting final implant alignment.

Purpose of the Study:

  • To investigate and quantify the rasp-stem correspondence of the cementless CLS system (Centerpulse).
  • To compare the rasp-stem mismatch of the CLS system with the CBC-T system (Mathys).
  • To assess the clinical relevance of any observed rasp-stem mismatch.

Main Methods:

  • A laboratory study was conducted to measure the positional differences between the trial rasp and the final implant stem.

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  • Measurements were performed in three orthogonal directions for both the CLS and CBC-T systems.
  • Geometric analysis focused on identifying sources of mismatch, particularly at the corners of the rasp and stem.

    • Main Results:

    • Both the CLS and CBC-T systems demonstrated an average rasp-stem mismatch of less than 2 mm in all three orthogonal directions.
    • The observed mismatch was primarily attributed to geometric differences at the corners between the rasp and the stem.
    • No significant correlation was found between specific geometric features and the degree of mismatch.

    Conclusions:

    • The rasp-stem mismatch for both the CLS and CBC-T systems is minimal and within acceptable limits.
    • The geometric characteristics at the corners of the rasp and stem are the main contributors to the observed mismatch.
    • The measured rasp-stem mismatch is not anticipated to have adverse clinical consequences in total hip arthroplasty.