Although his injuries may not be career ending, Yoenis Cespedes' achilles tendon might take him out of the Mets during the 2019 season. His injury showed calcifications of his tendons along with heel spurring. These can be detrimental to everyone's quality of life regardless of how athletic they may be.
There are many treatments including physical therapy, which includes stretching exercises and other conservative modalities. Orthotics and shoes may also help in a conservative manner. However, if the situation is not helped with conservative measure, one should consider surgery as Yoenis Cespedes did.