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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...

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Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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Measuring acetabular component position on lateral radiographs - ischio-lateral method.

Nicholas Pulos1, John V Tiberi Iii, Thomas P Schmalzried

  • 1Pennsylvania University School of Medicine, Philadelphia, Pennsylvania 19104, USA. nicholas.pulos@uphs.upenn.edu

Bulletin of the NYU Hospital for Joint Diseases
|November 1, 2011
PubMed
Summary

The ischio-lateral method, using a skeletal reference, offers more consistent acetabular component measurements than the traditional film edge method. This improved accuracy in radiographic assessment aids in evaluating arthritis and arthroplasty outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Biomedical Engineering

Background:

  • Standard evaluation of arthritis and arthroplasty relies on plain film measurements using the film edge for orientation.
  • A novel approach, the ischio-lateral method, utilizes the ischial tuberosity as a skeletal reference for radiographic evaluation.

Purpose of the Study:

  • To evaluate the reliability and consistency of the ischio-lateral method for acetabular component measurement using lateral radiographs.
  • To compare the ischio-lateral method with the traditional film edge orientation method.

Main Methods:

  • Analysis of postoperative radiographs from 52 hips, with at least three true lateral views per hip.
  • Measurement of acetabular component position using both the historical film edge method and the ischio-lateral method.
  • Assessment of measurement consistency through standard deviation and intra-class correlation coefficients.

Main Results:

  • The ischio-lateral method demonstrated a significantly lower mean standard deviation (2.2°) compared to the historical method (3.7°, p < 0.001).
  • Fewer hips showed a standard deviation greater than ±4° with the ischio-lateral method (11.5%) versus the historical method (36.5%).
  • High intra- and inter-observer reliability was observed for the ischio-lateral method.

Conclusions:

  • The ischio-lateral method provides a more consistent and reproducible measurement of acetabular component position compared to the traditional film edge method.
  • This skeletal reference method enhances the reliability of radiographic assessments in orthopedic surgery without additional cost or complexity.