ArticleArthroscopy, sports medicine, and rehabilitation2024
The Perfect Circle Technique Shows Poor Inter-rater Reliability in Measuring Anterior Glenoid Bone Loss on Magnetic Resonance Imaging.
Article in Arthroscopy, sports medicine, and rehabilitation, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- An Anatomic Study of the Human Glenoid Fossa: Implications for Preoperative Evaluation of Bone Loss in Patients With Traumatic Shoulder Instability.Orthopaedic journal of sports medicine · 2026Article
- Shoulder Instability in the U.S. Military: A Systematic Review of Epidemiology, Operative Management, and Outcomes.Journal of clinical medicine · 2025Review
- Glenoid Bone Loss After Unidirectional Versus Combined Shoulder Instability: Letter to the Editor.Orthopaedic journal of sports medicine · 2025Article
- Glenoid Bone Loss After Unidirectional Versus Combined Shoulder Instability: Response.Orthopaedic journal of sports medicine · 2025Article
- Comparison of Glenoid Bone Loss After Unidirectional Versus Combined Shoulder Instability in a Military Population.Orthopaedic journal of sports medicine · 2025Article
- Arthroscopic Bone Block Stabilization for Anterior Shoulder Instability with Subcritical Glenohumeral Bone Loss.Current reviews in musculoskeletal medicine · 2024Review
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Purpose: To evaluate the reliability of the perfect circle methodology for measurement of glenoid bone loss in patients with anterior glenohumeral instability. Methods: We performed a chart review of retrospectively collected patients who underwent isolated arthroscopic anterior labral repair between January 1 and June 30, 2021, using our institution's electronic medical records. The inclusion criteria included isolated anterior shoulder instability with anterior labral repair and corroborated tears on magnetic resonance imaging. A total of 9 raters, either sports or shoulder and elbow fellowship-trained orthopaedic surgeons, each evaluated the affected shoulder magnetic resonance imaging scans twice, with a minimum of 2 weeks between measurements. Measurements followed the "perfect circle" technique and included projected anterior-to-posterior glenoid diameter, amount of posterior bone loss, and percentage of posterior bone loss. Intrarater reliability and inter-rater reliability were then determined by calculating intraclass correlation coefficients (ICCs). Results: Ten consecutive patients meeting the selection criteria were chosen for inclusion in this analysis. Average estimated bone loss for the cohort was 2.45 mm, and the mean estimated glenoid diameter of the involved shoulder was 28.82 mm. The average percentage of bone loss measured 8.54%. The ICC for interobserver reliability was 0.55 for the perfect circle diameter and 0.17 for the anterior bone loss measurement (poorly to moderately reliable). The ICC for intraobserver reliability was 0.69 for the perfect circle diameter and 0.71 for anterior bone loss (moderately reliable). Conclusions: The perfect circle technique for estimating anterior glenoid bone loss on magnetic resonance imaging was found to have moderate intrarater reliability; however, reliability between observers was found to be moderate to poor. Level of Evidence: Level IV, diagnostic case series.
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