Twisted tibia is also called tibial dischondroplasia or TD. It can become evident in the first weeks, and can become worse as the chickens grow, as varus valgus can as well. Here are some snoozy long articles that discuss that genetics and rapid growth may be a factor:
https://academic.oup.com/ps/article/91/1/62/1596938
https://watermark.silverchair.com/p...ECn-nT03TkC7qXGvVmaWUyY69Ne1EWNQlWpNwFl3aGohs
https://academic.oup.com/ps/article/91/1/62/1596938
https://watermark.silverchair.com/p...ECn-nT03TkC7qXGvVmaWUyY69Ne1EWNQlWpNwFl3aGohs
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