Responsa for Chullin 107:45
ניקבה הגרגרת או שנסדקה
For R'Mattena ruled: If the top of the femur slipped out of its socket, the animal is trefah - Now R'Johanan who said that the former Mishnah, namely, 'The following [defects] render cattle trefah', was to be emphasized.
Shut min haShamayim
They responded: There is a great principle in the kashrut of animals: "One who adds, will have added life, and one who does not add, let him be gathered away." (Taanit 31a.4) It seems from this that one who is stringent is blessed.2The opposite principle is mentioned in Chullin 54a.10, see Mishneh Torah, Shechitah 10.12
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