Head measuring bigger & legs measuring shorter

I am currently 28 weeks + 1

And at my growth scan baby measured as;

HC - 277mm (29 weeks + 4)

FL - 48mm (26 weeks + 1)

AC - 237mm (28 weeks + 5)

They highlighted the femur length, they have now referred me to Fetal specialist. Has any one had this or similar? What am I to expect at the appointment.

Any one had anything similar?

I am sorry if this is in the wrong group!