Shoulder strength tests
| Post op | Athletic shoulder test (T-position)* | HHD† | Grip strength | Plyometric push-up‡ | ||||||
| Net peak force§ (NPF) (N) | RFD 0-100 ms† † (N/s) | Prone ER (kg) | Neutral grip (kg) | Peak landing | ||||||
| Left | Right | Left | Right | Left | Right | Left | Right | Total force (L+R) (N) | Asymmetry | |
| Week 6 | 88.4 | 115.0 | 367 | 591 | 16.5 | 23.0 | 56.1 | 56.4 | N/a¶ | |
| Week 10 | 121.2 | 118.9 | 445 | 580 | 21.0 | 21.3 | 57.4 | 63.5 | 1939 | 17% R** |
*Single force platform unilateral test—player lying prone with straight arm abducted to 90° (figure 2).
†Hand-held dynamometry (make test) - Prone External Rotation (ER) at 90 degrees Abduction.
‡Dual force platform bilateral test.
↵§Net peak force=total peak force—force at start of contraction.
¶N/a; not applicable—plyometric push-ups not performed until week 8 postop.
**R=increased peak landing force on the right upper limb (17% higher than left in this example (bold values indicate true deficits).
††RFD 0-100 ms; average rate of force development over the first 100ms after the start of contraction - 23 % lower rate of force development in a T-position on the affected left shoulder (bold values).