My opinion, genetic memory is relative... we all have genetic memory from all the diseases our ancestors went through, it's a fact, that is why we can't get many of the diseases our ancestors went through, because it's coded into our DNA what they went through and how to code immunity against those diseases.

But going so far as to say our body codes injuries, etc... is a little hard to fathom, there is only so much DNA to go around... but hey, i've been wrong before xD