Shoulder Superior Labral Repair

The upper part of the glenoid labrum has a clear morphological diversity if we compare it with the lower part. It invokes the meniscal morphology, with a roughly triangular section, the margin thin free towards the center of the joint and an insertion at the glenoid rim relatively vulnerable as constituted by a connective end that can be stretched easily since the lack of inelastic fibers. By light microscopy, there is a transition zone between the fibrocartilaginous hyaline cartilage of the glenoid labrum and the labral tissue. The study by electron microscopy [29] shows that in this transitional area, fine fibrils in the labrum fit the glenoid rim with Sharpey’s fibers in radial course. By contrast, the fibrils of the capsule of the glenohumeral ligament, the biceps tendon, and labrum are parallel to the bone.