Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Errors in measurement of acetabular index

N M Portinaro1, D W Murray, T P Bhullar

  • 1Ospedale San Raffaele, Milan, Italy.

Journal of Pediatric Orthopedics
|November 1, 1995
PubMed
Summary

Acetabular index measurement errors can occur due to patient positioning and observer variability. These errors, particularly with pelvic flexion/extension, can significantly impact diagnostic accuracy in pediatric hip assessments.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Knee arthroplasty compared with joint distraction for osteoarthritis: a phase III randomized controlled trial.

Bone & joint open·2025
Same author

The outcomes of acute periprosthetic joint infection following unicompartmental knee replacement managed with early debridement, Antibiotics, and implant retention.

The Knee·2024
Same author

No exponential rise in revision knee replacement surgery over the past 15 years: an analysis from the National Joint Registry.

Osteoarthritis and cartilage·2022
Same author

Five-year results of a randomised controlled trial comparing cemented and cementless Oxford unicompartmental knee replacement using radiostereometric analysis.

The Knee·2021
Same author

Age stratified, matched comparison of unicompartmental and total knee replacement.

The Knee·2020
Same author

Lifetime revision risk for medial unicompartmental knee replacement is lower than expected.

Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA·2020

Area of Science:

  • Pediatric Orthopedics
  • Radiographic Imaging Analysis
  • Biomedical Engineering

Background:

  • Accurate determination of the acetabular index is crucial for diagnosing developmental dysplasia of the hip.
  • Previous studies have identified potential sources of error in acetabular index measurement, including patient positioning and observer variability.
  • Quantifying these errors is essential for improving diagnostic reliability in pediatric populations.

Purpose of the Study:

  • To determine the magnitude of errors in acetabular index measurement.
  • To investigate the impact of pelvic rotation and flexion/extension on measurement accuracy.
  • To assess inter- and intraobserver variability in acetabular index determination.

Main Methods:

  • Postmortem radiographic studies were conducted on pediatric pelvic specimens.

Related Experiment Videos

  • Pelvic rotation and flexion/extension angles were systematically varied.
  • Obturator foramina ratio was used to control for pelvic rotation.
  • Inter- and intraobserver measurements were performed to quantify variability.

    • Main Results:

    • Pelvic rotation errors were +/- 3 degrees when the obturator foramina ratio was between 0.5 and 2.
    • Pelvic flexion/extension errors were +/- 3 degrees when confined to +/- 10 degrees.
    • Intraobserver error was +/- 2 degrees, and interobserver error was +/- 3 degrees, leading to a total error of +/- 5 degrees.
    • Errors could reach up to 10 degrees with uncontrolled pelvic flexion/extension (e.g., 20 degrees from neutral).

    Conclusions:

    • Significant errors can occur during acetabular index measurement due to patient positioning and observer variability.
    • Controlling pelvic flexion/extension is challenging and can lead to substantial measurement inaccuracies.
    • Surgeons must be aware of these potential large errors to ensure accurate pediatric hip assessments.