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Related Experiment Videos

Head-neck modularity for total hip arthroplasty. Is it necessary?

W J Hozack1, J J Mesa, R H Rothman

  • 1Department of Orthopaedic Surgery, Jefferson Medical College, Philadelphia, Pennsylvania, USA.

The Journal of Arthroplasty
|June 1, 1996
PubMed
Summary

Modular femoral components offer convenience, but neck length adjustments are crucial. In 19% of total hip replacements, final neck length differed, highlighting the need for intraoperative adjustability in cementless femoral components.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Arthroplasty Research

Background:

  • Modular femoral components in total hip arthroplasty (THA) provide surgical flexibility.
  • Theoretical concerns exist regarding the long-term stability and outcomes of modular junctions.
  • Accurate restoration of leg length and hip biomechanics is critical in THA.

Purpose of the Study:

  • To evaluate the discrepancy between the pre-operative planned neck length and the final intraoperatively selected neck length for cementless femoral components.
  • To assess the implications of neck length adjustments on component selection and potential surgical complications in primary THA.

Main Methods:

  • A consecutive series of 100 primary cementless total hip arthroplasties were reviewed.
  • The planned neck length (based on broach trial reduction) was compared to the final impacted femoral component neck length.

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  • The frequency of neck length changes after femoral component impaction was recorded.

    • Main Results:

    • In 19% of cases, the final neck length chosen after femoral component impaction differed from the initial trial reduction selection.
    • Such discrepancies could lead to leg-length inequality or necessitate discarding appropriately sized femoral components.
    • This indicates a significant need for intraoperative neck length adjustability in cementless femoral components.

    Conclusions:

    • The ability to adjust femoral component neck length after impaction remains a clinically important feature in cementless total hip arthroplasty.
    • Failure to account for intraoperative adjustments can compromise surgical outcomes, including leg length equalization.
    • Further investigation into the factors influencing neck length selection and the long-term effects of modularity is warranted.