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Related Experiment Videos

A clinically practical method of manually assessing polyethylene liner thickness.

D Pollock1, C J Sychterz, C A Engh

  • 1Anderson Orthopaedic Research Institute, P.O. Box 7088, Alexandria, VA 22307, USA.

The Journal of Bone and Joint Surgery. American Volume
|December 13, 2001
PubMed
Summary

The wear-template method accurately measures polyethylene wear in hip implants, outperforming other manual radiographic techniques. This simple method aids orthopaedists in assessing component thickness for patient care.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Radiographic Imaging

Background:

  • Orthopedic surgeons often rely on manual radiographic methods to assess polyethylene wear in hip implants due to limited access to advanced computer-assisted techniques.
  • The clinical accuracy of these manual methods for polyethylene wear assessment has not been thoroughly validated.
  • This study compares the accuracy of manufacturer-developed wear templates against other common manual radiographic techniques.

Purpose of the Study:

  • To compare the accuracy of the wear-template method with two other manual radiographic techniques (Dorr and Livermore methods) for assessing polyethylene wear.
  • To determine the clinical usefulness of these manual methods in evaluating polyethylene thickness in individual patients.

Main Methods:

  • Seventeen retrieved polyethylene liners were analyzed after an average of 12.0 years in situ.

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  • Direct measurement of the minimum polyethylene thickness was performed using digital calipers.
  • Polyethylene thickness was also measured on pre-revision anteroposterior pelvic radiographs using the Dorr, Livermore, and wear-template methods.

    • Main Results:

    • The wear-template method demonstrated the lowest mean error (-0.04 ± 0.28 mm), significantly more accurate than the Dorr method (1.54 ± 1.21 mm).
    • The Livermore method also showed a low mean error (0.07 ± 0.62 mm), with both methods not significantly different from zero.
    • While accurate, all methods exhibited wide ranges of error; the wear-template method had the narrowest limits of agreement.

    Conclusions:

    • The wear-template method is recommended for practicing orthopedists due to its accuracy, simplicity, and efficiency in assessing polyethylene thickness.
    • This method involves placing a template over the radiograph and measuring distances, requiring no manufacturer-specific data.
    • Compared to other methods, the template technique is less time-consuming and easier to explain to patients.