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It is a very thick nerve, so I think it is hard to tear without physically cutting it. Also if it tore you would have tibial and common fibular nerve symptoms as well. You would see sensory numbness and tingling along the dermatome
also the mechanism of injury is focused on spine so a disc rupture is more likely
I got this question wrong but I really like because it helped me get past a confusion I hadon this subject. If it were a tear, you'd see the loss of motor function that sugaplum was taling about(FA 444 2019). But if it's a herniation, like in this case, you see Radiculopathy/Sciatica symptoms that are on 446.