What is the glenoid vault?
The glenoid vault axis is defined as the line connecting the tip of the scapular vault and the center of the glenoid line (red solid line). Glenoid version measured with the vault method (β) is calculated as the angle between the glenoid line and the line perpendicular to the glenoid vault axis (red dashed line).
What is Friedman’s line?
The scapular axis (Friedman line) is marked in red. The line perpendicular to the scapular axis passing through the centre of the glenoid is marked in green and the line connecting the rims of the glenoid is marked in yellow. The angle of glenoid version is marked in blue. Source publication.
What is glenoid inclination angle?
Glenoid inclination angle was defined as the 3D angle between a line connecting the intersection of the scapular spine and the medial border (Figure 1, point A) to the spinoglenoid notch (Figure 1, point B) and a line connecting the superior glenoid rim (Figure 1, point C) and inferior glenoid rim (Figure 1, point D).
How to measure glenoid version on mri?
To assess glenoid version, a line was drawn from medial corner of the glenoid body to midpoint of the glenoid face. A line perpendicular to this was the reference against which to measure glenoid version. Measurements were repeated after 3 months to assess intra- and interobserver reliability.
What is humeral Retroversion?
Humeral retroversion is generally defined as the angular difference between the orientation of the proximal humeral head and the axis of the elbow at the distal humerus. The retroversion angle of the humeral head has a wide range of variability, from –6° to 60°.
What is glenoid dysplasia?
Glenoid hypoplasia, also known as glenoid dysplasia and dysplasia of the scapular neck, is a failure of ossification of the posteroinferior two-thirds of the glenoid. Once thought to be a rare condition, more recent studies have shown that the incidence of glenoid hypoplasia ranges from 18% to 35%.
How do I tell what version of glenoid I have?
To measure glenoid version by using the Friedman method, a line is drawn down the long axis of the scapula, from the tip of the medial border of the scapula to the center of the glenoid. A line drawn perpendicular (90°) to this line is referred to as the line of neutral glenoid version.
What is RSA angle shoulder?
The reverse shoulder arthroplasty angle (RSA angle), defined as the angle between the inferior part of the glenoid fossa and the perpendicular to the floor of the supraspinatus, was compared with the global glenoid inclination (β angle or total shoulder arthroplasty [TSA] angle).
Which is better, the glenoid vault or the conventional glenoid?
The conventional measuring method for glenoid version is greatly influenced by the scapular body shape that varies widely between patients. We postulated that the glenoid vault version could be more useful than the conventional glenoid version in clinical cases.
What’s the difference between glenoid and normal shoulder?
(A) The vault method for measuring a normal shoulder. Glenoid vault retroversion is 9.7°. The difference between conventional glenoid version and glenoid vault version is only 3.5°. (B) The glenoid has 5.0° retroversion when measured with the vault method.
How is the histogram of glenoid vault version measured?
The histogram of glenoid version measured with the two different methods. (A) The histogram of glenoid version in the normal shoulders. The values measured with the conventional method are concentrated between -5° and 5°, and those with the vault method are between 5° and 15°.
How is the glenoid vault axis measured in computed tomography?
The glenoid vault axis is defined as the line connecting the tip of the scapular vault and the center of the glenoid line (red solid line). Glenoid version measured with the vault method (β) is calculated as the angle between the glenoid line and the line perpendicular to the glenoid vault axis (red dashed line).