RedactedNarrative: 2 PWC's collided causing operator of vessel #1 to sustain a severely fractured right leg.  Unknown cause of accident or 2nd operator/vessel.  Hit and run.  Officer was unable to confirm who owned vessel #1 as it was released to the operator on his word that he owned it.  It was not registered in his name and the current person it was registered to was unable to be contacted.  Operator was sent a citation for not filling out a bar and not registering the PWC in his name.