My son's height for reference 50" (4'2"), 55lbs, wears a size 8. I believe when we measured his knee it was 10.5 "But I don't remember exactly. My son (7, almost 8) developed tendonitis in his knee and his doctor recommended me an orthosis. This fits perfectly under sweatpants or over jeans and is very easy to make yourself. If." if it doesn't get it right it slips down sometimes but that's the only problem we would definitely order it again.
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