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Pelvic tracker effects on hip center accuracy using imageless navigation.

William M Mihalko1, Matthew J Phillips, Zair Fishkin

  • 1Department of Orthopedic Surgery, State University of New York, Buffalo, NY, USA. wmm4n@virginia.edu

Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery
|October 25, 2006
PubMed
Summary
This summary is machine-generated.

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Determining the hip joint center for knee surgery is crucial. While pelvic trackers showed differences, the lower extremity mechanical axis remained consistent, suggesting algorithms to mitigate pelvic movement noise are needed.

Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical imaging

Background:

  • Imageless computer-assisted total knee surgical systems often use the functional rotational center of the femoral head.
  • This landmark is critical for determining the lower extremity mechanical axis during surgery.
  • Current methods involve range of motion and center of rotation calculations of the femur relative to the pelvis.

Purpose of the Study:

  • To evaluate the accuracy of an algorithm for determining the lower extremity mechanical axis with and without a pelvic tracker.
  • To compare functional hip joint center calculations with true radiographic centers determined by CT data.

Main Methods:

  • The study utilized six lower extremities from three whole-body cadavers.
  • Functional hip joint centers were calculated with and without a pelvic tracker attached to the iliac crest.

Related Experiment Videos

  • These functional centers were compared to true radiographic centers derived from spiral CT scans.

    • Main Results:

    • Significant differences were observed in the calculated hip joint center locations.
    • The functional hip joint centers, with and without a pelvic tracker, differed from each other and from the CT-determined center.
    • No significant differences were found in coronal plane measurements, but sagittal plane measurements showed statistically significant variations.

    Conclusions:

    • Despite differences in hip joint center location, the resulting lower extremity mechanical axis determination showed minimal variation.
    • The study suggests that algorithms minimizing pelvic movement noise could eliminate the need for pelvic trackers in imageless computer-assisted surgery.