I do not see vanity here. He is showing (the best way possible) the difference between his two legs. No big deal.
There is no need to flex your muscle in order to compare two limbs.
Besides, one limb is clearly postoperative and highly swollen, so to even attempt to compare it to the nonoperative site is just foolish.
No doctor would use that picture as a comparison.
If he truly wanted to show the difference in muscle composition between legs, he simply would need to wait for the swelling to go down.
Again, vanity..
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