Injuries involving tendons are generally, a compromise to the return of the animal, to the same level, to the sporting life. This is because the scar tissue that forms is less functional, leading to a reduction in sporting performance and a high risk of relapse.

The relapse rate in race horses treated with stem cells, with injuries in the superficial flexor tendon and performing the same sport, is of 28%, while in animals not treated with this method, the percentage rises to 56% of re-injuries.