Measurement of articular cartilage and glenoid labrum by CT arthrogram.

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The stability of the glenohumeral joint is composed of joint conformity, finite joint volume, adhesion/cohesion, ligamentous and capsular restraints, glenoid labrum and shoulder girdle musles. In this study, we report the depth of articular cartilige and glenoid labrum using CT arthrogram to clarify the conformity of the glenohumeral joint.Eight normal subjects were examined. Air, or air with radioopaque fluid, were injected into the glenohumeral joint. The width and depth of cartilage and the labrum were then examined by computed tomography.The average maximum transverse diameters of the humeral head and glenoid were 40.3 and 25.6mm respectively. The transverse distance from the anterior to posterior labrum was 30.7mm. The average thickness of the anterior and posterior labrum wer 5.2 and 5.9mm respectively. The glenoid cartilage was divided into five parts from anterior to posterior and their respective thicknesses were 3.0, 1.6, 1.3, 1.5 and 2.9mm.These results show that the stability of the glenohumeral joint is increased by 120% due to the articular cartilage and glenoid labrum compared to the bony portion of the glenoid in normal subjects.