The athletic injuries that do occur are usually minor contusions and sprains.
Thus the bituminous and fatty matters found about the mummies and their wrappings were employed as a sovereign remedy, particularly for wounds and contusions, and a brisk trade began in these "exudations" of mummies.
Theory is I'm having spontaneous contusions into the soft tissues on top of the joints.
The muscles and associated tissues in this region had been destroyed and there were very extensive subcutaneous contusions.
One of the complications associated with muscle contusions is called myositis ossificans (bone growth within the muscle ).