[thstone]

The major risks are that the CV joint that has had all of the grease washed out is damaged beyond rebuild by further driving or could completely fail from lack of lubrication.

Since there is no noise or issues, there might still be enough grease in the joint to keep it operable for a few hundred more miles BUT you'd hate to drive it and then have to replace the entire assy at considerable more cost. Its really a roll of the dice.

The safe bet is to park it until it can be properly repaired.