I am not sure you would need to ask the breeder @lpatelski but going by her results show that they don't have leg issues
Post: https://www.backyardchickens.com/threads/dark-cornish-white-rock-cross.878547/page-3#post-16250157
Posting what lpatelski posted back in 2014 so her pictures show, Bob is quite the huge Cornish/Cornishx cross
"Okay I have a little update: No records of any kind being broken here, but good healthy weights.
All the progeny below are a Pure Dark Cornish "BamBam" over a McMurray Cornish
Bob DOH(Date of Hatch) 8/20/15 is 17 weeks today and weighs 11 pounds 2.7 ounces
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Bob as a youngster I used grams so he was 1448g on 9/24/15 so a little over 3 pounds at 35 days.

