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Novel anterior coracoglenoid line utilizing magnetic resonance imaging (MRI) corresponds with critical glenoid bone loss

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Abstract

Objective

Glenoid bone loss is estimated using a best-fit circle method and requires software tools that may not be available. Our hypothesis is that a vertical reference line drawn parallel to the long axis of the glenoid and passing through the inflection point of the coracoid and glenoid will represent a demarcation line of approximately 20% of the glenoid. Our aim is to establish a more efficient method to estimate a surgical threshold for glenoid insufficiency.

Methods

Fifty patients with normal glenoid anatomy were randomly chosen from an orthopedic surgeon’s database. Two orthopedic surgeons utilized T1-weighted sagittal MRIs and the coracoglenoid line technique to determine the percentage of bony glenoid anterior to vertical line. Two musculoskeletal radiologists measured the same 50 glenoids using the circle technique. Differences were determined using dependent t test. Reliability was compared using interclass correlation coefficient and Kappa. Validity was compared using Pearson correlation coefficient.

Results

Mean surface area of the glenoid anterior to the vertical line was on average 21.69% ± 3.12%. Surface area of the glenoid using the circle method was on average 20.86% ± 2.29%. Inter-rater reliability of the circle method was 0.553 (fair). Inter-rater reliability of the vertical line technique was 0.83 (excellent). There was a linear relationship between circle and vertical line measurements, r = 0.704 (moderate to high).

Conclusion

The coracoglenoid line appears to represent a line of demarcation of approximately 21% of glenoid bone anterior to the coracoglenoid line. Our technique was found to be reliable, valid, and accurate.

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Acknowledgements

The authors would like to acknowledge and thank John Popovich Jr., PhD, DPT, ATC for his expertise and assistance with performing the statistical analysis for this project.

Each author certifies that he or she has no commercial associations (e.g., consultancies, stock ownership, equity interest, patent/licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article.

IRB approval was obtained through Michigan State University. MSU study ID: STUDY00002101. This study was performed in accordance with the ethical standards in the 1964 Declaration of Helsinki and well as the US Health Insurance Portability and Accountability Act (HIPAA)

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Authors and Affiliations

  1. Michigan State University Orthopedic Surgery Residency, McLaren Greater Lansing Hospital, 401 W. Greenlawn Ave, Lansing, MI, 48910, USA

    Neil Olmscheid, Stanley D. Crawford & Christopher Dickinson

  2. Department of Radiology, Michigan State University, 846 Service Road, East Lansing, MI, 48824, USA

    Ryan S. Fajardo & Jeffrey J. Knake

  3. Michigan State University, Michigan State University Sports Medicine Faculty, 4660 South Hagadorn Road, Suite 420, East Lansing, MI, 48823, USA

    Christopher L. Wilcox

  4. Orthocollier, 1250 Pine Ridge Rd, #202, Naples, FL, 34108, USA

    Patrick Joyner

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  1. Neil Olmscheid
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  2. Stanley D. Crawford
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Correspondence to Neil Olmscheid.

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Olmscheid, N., Crawford, S.D., Dickinson, C. et al. Novel anterior coracoglenoid line utilizing magnetic resonance imaging (MRI) corresponds with critical glenoid bone loss. Skeletal Radiol 51, 1433–1438 (2022). https://doi.org/10.1007/s00256-021-03981-8

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  • DOI: https://doi.org/10.1007/s00256-021-03981-8

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