Hi, thanks for writing to HCM.
There is no bearing or relationship between triple arthrodesis
and your thigh aches.
Propably they may be resulting from a problem in the Lumbar spine
(as you are feeling pain in both thighs). I suggest you to undergo an MRI scan of the Lumbar spine to diagnose the cause.
In the meantime, Use some analgesic
prepartations, Neurotropic drugs like Pregabalin
& methylcobalamine and Ice packing of the affected areas.
Hope this information is helpful. Good day