I have a 50% rotator cuff tear. at what point should it be repaired? i just had a cortisone shot about 2 weeks ago which is already wearing off.

Difficult: It is personal and surgical decision. You will be out of work for at least 6 weeks. Discuss options with your surgeon.

You've answered the?: If the cortisone shot gave so little relief in time, the tear will not heel itself. You'll be miserable sleeping. It will impair activities of daily living. Talk with an orthopedist! sooner than later!

Depends: If the pain and disability are not tolerable it may be time. You need to discuss this with your orthopedist.