citrobacter koseri uti causing septic hip?

an adult patient with history of sickle cell disease and hip replacement about one year ago,  was recently diagnosed with asymptomatic uti (actually was bacteruria around 50,000 per... ,way under 100K).Per info given, this caused a bacteremia, leading to a septic hip. the patient was just recovering from a "staph coag negative" infection which was treated for six months with iv antibiotics, and it seemed to be resolved per blood results.
1) What are the risk factors for getting citrobacter koseri(CK) uti?
2) Why would this CK uti lead to a septic hip? how long would this progression take?

The patient recently started having vague neurological symptoms(imbalance in both legs, headaches, but previous reading only talk of neurological problems in babies. Patient has meeting with neuro specialist in a few months:
3) Can neurological problems result from patient's medical course?
  


This discussion is related to CITROBACTER KOSERI.