Team doctors are not employees. They are consultants. They all have practices outside of the team seeing every normal patients.
No doctor is going to risk doing what the team wants because the team wants it. They still have a moral obligation to the patient and if the risk of malpractice is much higher dealing with professional athletes, esp like Kwahi, et al. That if they purposely sent them out knowing they were injured, it could end that doctor's career.
Nothing is exact science in medicine and at some point each person has to take personal responsibility for their actions. Case in point with KD. I'm sure he was warned about the risks of playing last night. But it was *his* decision to suit up and play.
IT made the same decisions while in Boston. From what I remember, he has FAI, a congenital condition that results in early osteoarthritis, only made worse by the heavy pounding of playing professionally. Also leads to labral tears. Only treatment I know of is an osteotomy which probably would have ended his career or set it back years. Nature altered the course of his career, not medicine, not the celtics.