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I wouldn't argue Zhang Jike's techniques were near perfect at all, at least for the modern ball. But everyone can debate technical issues and some say that he had congenital issues.Broadly speaking, no sport is safe, especially when you're pushing for human boundaries like elite athletes. One could argue Zhang Jike's techniques are near perfect, but he had really bad back injuries during his career as well.
But in addition to things like bracing the spine or relying more on power from the legs etc., there is a lot of stuff that one has to do to make sure that the spine resists bending when trying to hit powerful strokes or carry large loads. These are just as technical as they are self care. IMHO. People who lose their backs to these things are sometimes over using spine bending technique. Of course, without knowing the specifics of Nina's case, I could be completely wrong. But one should be generally careful when practicing using technique that requires the spine to bend (which some people do when looping chop for example).