The Effect of Scapula Tilt and Best-Fit Circle Placement When Measuring Glenoid Bone Loss in Shoulder Instability Patients

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
Philipp MoroderMarkus Scheibel

Abstract

To analyze the effect of lack of standardization on the reliability of current measurement techniques for glenoid bone loss in clinical practice. Ten consecutive patients with anterior glenoid bone loss due to recurrent anterior shoulder instability and available computed tomographic (CT) scans of the affected shoulder were included in this study. One hundred seventy 3-dimensional en-face view images of the 10 glenoids with up to 20° degrees of tilt in the anterior, posterior, superior, and inferior direction were rendered. Three independent observers first identified the en-face view images and subsequently performed measurements of the defect surface and diameter as well as the glenoid surface and diameter on all 170 images. Measurements were completed based on the conventional best-fit circle technique using the edge of the visible glenoid bone as reference and additionally based on the so-called spoon technique, which places the best-fit circle on the edge of the visible glenoid concavity. The overall agreement regarding en-face view image selection between the observers was 30% (K-alpha = 0.10, 95% confidence interval 0.02-0.22). Tilt of the en-face view in any direction resulted in significant alterations of all 4 measure...Continue Reading

Citations

Jan 15, 2019·The American Journal of Sports Medicine·Philipp MoroderMohammad Khatamirad
Mar 15, 2019·The American Journal of Sports Medicine·Neil K BakshiAsheesh Bedi
Mar 15, 2019·The American Journal of Sports Medicine·Lukas P E VerweijMichel P J van den Bekerom
Oct 28, 2019·Chinese Medical Journal·Yong-Gang WuChun-Yan Jiang
Nov 2, 2019·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Norishige IizawaShinro Takai
Feb 25, 2020·Archives of Orthopaedic and Trauma Surgery·Elisabeth BoehmMarkus Scheibel

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