Table 1 Maximum and minimum moment arms of the middle, anterior and posterior sub-regions of the deltoid during scapular-plane abduction, coronal-plane abduction and flexion [36]
From: Prosthesis design and placement in reverse total shoulder arthroplasty
| Â | Scapular-plane abduction | Coronal-plane abduction | Flexion | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Muscle/muscle sub-region | Max | θ | Min | θ | Max | θ | Min | θ | Max | θ | Min | θ | |
Anterior deltoid | Anatomical | 39.3 | 120.0 | 2.1 | 2.5 | 30.2 | 120.0 | 2.0 | 2.5 | 40.0 | 120.0 | 11.6 | 2.5 |
RSA | 38.6 | 97.5 | 7.4 | 2.5 | 35.8 | 90.0 | 15.6 | 2.5 | 36.0 | 75.0 | 25.9 | 2.5 | |
Middle deltoid | Anatomical | 33.1 | 120.0 | 6.7 | 2.5 | 29.1 | 86.3 | 8.3 | 2.5 | 12.2 | 120.0 | 0.0 | 2.5 |
RSA | 42.9 | 82.5 | 22.5 | 2.5 | 46.3 | 86.3 | 30.2 | 2.5 | 27.0 | 120.0 | 14.2 | 2.5 | |
Posterior deltoid | Anatomical | −14.9 | 34.0 | 3.0 | 120.0 | −15.9 | 5.0 | 2.0 | 120.0 | −33.0 | 30.0 | −16.3 | 120.0 |
RSA | −12.4 | 2.5 | 5.2 | 120.0 | 14.1 | 120.0 | 1.3 | 2.5 | −17.6 | 27.5 | −13.1 | 108.8 | |