Even a few millimeters here or there can have a big impact. I have a 3mm offset in length between my legs. If I just wear shoes normally, I get searing pain in my right knee from just a little walking. But with a 3mm boost in my left shoe insert, things are even and I get no pain. (Doctors try to tell me that only severe imbalances over 10mm can cause pain problems—ha!) So I wouldn’t be surprised if your 5x1.5mm offset could be felt in your knee.
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