Reverse polarity shoulder replacement: Current concepts and review of literature

Figure 1 Shoulder replacement, shoulder with native glenohumeral joint and osteoarthritis. A: Following total shoulder replacement; B: Following reverse shoulder replacement. The interval between the two plumb lines is wider than in Figures 1A, C and D, indicating medialisation of the center of shoulder rotation. The longer distance between the acromion and humerus allows restoration of the deltoid length and tension; C: Native glenohumeral joint. A short plumb line showing the distance between the lateral edge of acromion and humerus head. A long plumb line is drawn from the inferior surface of acromion to the center of shoulder rotation. The interval between the short and long plumb lines is smaller than the interval in Figure 1B; D: Shoulder with osteoarthritis.