• I think rdiding fixed makes youe knee stronger. Like any form of resistance exercise you need to start with less i.e a lower gear and build it up slowly. After time it will build up the ligament and muscle around the knee making it stronger. The times when you hurt your self tend to be when you do things you don't usually do and hence you body is has not built up to it. That my opinion and expericence any way, my knees feel better overall* after riding fixed than they did before.

    *I say overall but I twisted my knee two weeks ago, but that was doing something I don't usually do and hence pushing it beond it's normal loads / stresses.

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