I think quite a few of us end up having leg, hip or any lower extremity symptoms of some sort.
I think it is the fascia connection, it all starts to get sticky and bound up causing all sorts of annoying problems.
But that is just my theory
and from what I leaned by reading Sharon Butlers RSI book . She does Hellerwork and branched off to study RSI when she got symptoms of it.
I also have some minor long time misalignments that I think contribute to my hip/shoulder/rib symptoms. 35 yrs of being misaligned doesn't get fixed quickly.