A 3D-CT scan study of the humeral and glenoid planes in 150 normal shoulders.

Purpose: The purpose of the study was to determine the normal three-dimensional relationship between the humeral and the glenoid plane of the individual patient. We measured the three-dimensional angle between the glenoid plane and the humeral plane (glenohumeral angle, °GH) and the angle between the plane of the scapula and the plane of the glenoid (glenoscapular angle, °GS) with the patient in a standardized position to the CT scan gantry. We hypothesized that a normal distribution with a small variation would exist for both angles.

Three-dimensional analysis of the orientation and the inclination of the rotator cuff footprint.

Hypothesis: The tuberosities of the proximal humerus relate geometrically to the humeral head in an anteroposterior symmetry.

Material And Methods: Twenty-eight cadaveric shoulders were scanned with computed tomography and reconstructed digitally in 3 dimensions. On both tuberosities, 5 facets were identified.