Now, this condition and its treatment has not impeded me physically at all: I was quite active as a kid and continue to be so as an adult (numerous triathlons, a couple of marathons and various other running races, snowboarding, crossfit, parkour, etc.). This is good news for kids born with this fairly common condition (1/1000 births), and their concerned parents.
The only repercussion I’ve noticed has been a significant decrease in flexibility (dorsiflexion) of my affected ankle (right side). I didn’t become aware of this until my mid/late 20’s, though it may have been a factor before then — I just never noticed it. It’s most apparent when I squat down deep: my right heel comes off the ground right away, while my left heel stays flat on the ground as low as I can go. Stretching and yoga have helped my right ankle flexibility, but just a tad. This issue has been most noticeable when snowboarding, which require lots of ankle flexion in the rear foot (hence I’m goofy).
My right ankle seems to have a different skeletal structure which prevents it from flexing like my non-club side. Whether this was primarily a consequence of the casting treatment or the clubfoot condition itself, I’m not sure. Dr. Miskin feels it likely is a consequence of the condition itself. Another noticeable thing is the asymmetry in my calf muscle structure of my right vs left side: My right calf is significantly skinnier than my left calf — something you would only notice when I’m standing still and draw attention to it. My right foot is slightly shorter and wider than my left and has a significantly different wear pattern on the sole.