What is Rearfoot Adduction?

I came across the term rearfoot adduction in another thread and although I am sure that it must be self explanatory, unfortunately it isn’t for me. Can anyone define rearfoot adduction for me.

I came across the term rearfoot adduction in another thread and although I am sure that it must be self explanatory, unfortunately it isn’t for me. Can anyone define rearfoot adduction for me.

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What is Rearfoot Adduction?