What are you looking at in the diagram?? It is the force-time signal from a force plate of the jump phase of a countermovement jump (CMJ), one of the most common jumps used to quantify asymmetry by practitioners.

Which signal do you think is of an athlete who was cleared to return to play 12 months previously, after ACL repair and rehabilitation? The signal on the left is of a non-injured athlete and the right of the injured athlete described.

You don’t need numbers to see that there is something still not right. A good place to start when you have force plate technology is simply looking at the signal. If you were to look at the concentric peak force data (#1) you would assume there is little asymmetry and the rehab has gone very well. However, this is not the case. Even in the weighing phase (#2) you can see the client is loading both legs differently i.e. a standing weight asymmetry of ~5%, and during the unweighting phase the force trace is jagged (#3), both legs seeming to struggle with the unweighting/braking/eccentric phases. Also look what's happening around the timing of peak force between signals (#4). If you want to take your understanding of jump asymmetry testing to the next level, then check out this free resource https://lnkd.in/gEY6AzRi .