Even if your knee isn't hurting now, I would recommend you to start doing something that doesn't demand so much from your joints. The most likely thing is that it will happen again... I don't want to be a party spoiler, but having been fighting with one of those for several decades, I have learnt that the more you can spare them from strain and stress, the longer they'll last.

Anyway, maybe if you start practicing for one of these laufen around Zurich? The Greifenseelaufen will be in September and it seems to be good fun. You can run either 5k, 10k or the half marathon. There is event a family and kid event in the morning.

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My blogs: about food and Zurich 1200 fountains