Hit the head 50 days after FUE - could any damage to the grafts have occurred?

If the injury was severe enough to cause normal hair loss, then it may be an issue.  It would be impossible to dislodge a graft after a few weeks.

tamerkora,I hope that you are feeling ok.It is not very likely that you would damage grafts that were transplanted 50 days prior by blunt trauma while getting into car. Please visit your physician for the follow up care.

By 50 days the grafts are completely incorporated into the scalp just like untransplanted hair.The likelihood of injury is extremely low.

Thank you for your question. It is unlikely you did serious damage with a slight bump at day 50, however, you should feel free to consult with a board certified facial plastic surgeon to review your progress.
Best wishes,

If you did not cut or have blunt trauma to your scalp you should be fine. It would be difficult to damage the transplant.

I hope you head is okay! After 2 weeks your hair follicles should be fully embedded and so i would not worry about your head injury. 

By the 14th day, the grafts are secure in your scalp so trauma is like anytime you have hit your head prior to the transplant.