[JoeEOD]

I'm an Occupational Therapist these days and as the joke goes "OTs don't work below the waist". That being said, I recommend that you pursue one of two routes with your problem. I suggest you see a Podiatrist that specializes in athletic issues or a Physical Therapist specializing in sports medicine. Years ago the PTs had a poster showing a woman's feet in spike high heels that said "Your back problem may start lower than you think!" (Not that I am suggesting that you would wear high heels!)
The problem you are describing could be from overpronation of the foot - rolling inwards toward the arch. This is common with flat feet and your reconstruction may have introduced other instabilities that are affecting your foot strike and gait. The solution may involve an orthotic to fit into your shoe and/or exercises to stabilize the ankle.