What is the method for calculating glenoid (scapular fossa) bone loss?

From the Guidelines

To calculate glenoid bone loss, the Bernageau view is an effective method in demonstrating the degree of bone loss of the glenoid 1. When evaluating traumatic shoulder injuries, it is essential to use a combination of radiographic views, including anteroposterior (AP) views in internal and external rotation and an axillary or scapula-Y view 1. The Bernageau view is particularly useful in assessing the degree of bone loss of the glenoid or humeral head 1. Key points to consider when calculating glenoid bone loss include:

• Using radiography to assess for fracture and appropriate shoulder alignment 1
• Performing radiography upright to avoid underrepresentation of malalignment 1
• Considering additional views, such as the Bernageau view, to demonstrate the degree of bone loss 1 It is crucial to accurately assess glenoid bone loss, as significant bone loss can increase the risk of recurrent instability after standard arthroscopic repairs. In clinical practice, calculating glenoid bone loss is vital for determining the appropriate treatment approach, and the Bernageau view is a valuable tool in this assessment 1.

From the Research

Calculation of Glenoid Bone Loss

To calculate glenoid bone loss, several methods can be employed, including:

• Linear measurement techniques, such as the Shaha and Griffith methods 2
• Surface area measurement techniques, such as the Barchilon and PICO methods 2
• Statistical shape model-based measurement techniques, such as the Giles method 2
• Using a formula based on glenoid height and width measurements from MRI scans, such as the formula: Glenoid Width = (1/3 Height) + 15 mm for male subjects and W = 1/3 H + 13 mm for female subjects 3

Imaging Modalities

Different imaging modalities can be used to measure glenoid bone loss, including:

• Computed Tomography (CT) scans 4, 2, 5
• Magnetic Resonance Imaging (MRI) scans 3, 6
• 3D CT scans 2, 6

Accuracy and Reliability

The accuracy and reliability of glenoid bone loss measurements can vary depending on the method and imaging modality used. Studies have shown that:

• The Barchilon method has the best combined consistency and accuracy for measuring glenoid bone loss 2
• MRI can be used to accurately measure glenoid bone loss with a small margin of error 6
• The accuracy of measurements correlates with the level of training and experience of the observer 2, 6

Clinical Applications

Accurate measurement of glenoid bone loss is important for:

• Preoperative planning and decision-making in shoulder arthroplasty 4, 5
• Evaluating the severity of glenoid bone loss and determining the best course of treatment 4, 5
• Assessing the effectiveness of treatment and monitoring patient outcomes 4, 5