Did the scientists deliberately break the bones of the rabbits to perform the tests? I understand that there has to be a necessary evil, and the rabbits here ca

Did the scientists deliberately break the bones of the rabbits to perform the tests? I understand that there has to be a necessary evil, and the rabbits here can at least recover from bone fractures, while lab animals in other research projects may get infected with some diseases and die painfully. Yet, I still find the scene of breaking the legs of the rabbits one by one quite troubling. Anyway, I hope this glue gun project can finally succeed. My grandmother had a broken femur a year before she passed away. Although she could still walk with a walking frame after surgery, the irreversible loss of mobility was undoubtedly frustrating for her.