Our expert says:
Do you mean ligaments on the top of the foot? Are we talking about the bone, or is it the muscle underneath? The muscle often hurts because of calf muscle tightness, because they're all connected underneath the foot, from behind the heel to the front of the foot. So that may be part of it - and strengthening the calf would help prevent this.
If it's on the top, then it's more difficult to know what the cause might be. It may be something as simple as lacing the shoes too tightly which might cause bruising and pressure pain. Or it may be the bone, in which case it would be more serious (but also less likely because you are only sore for a short time and only when running).
I'd say it may be worth looking at the shoes, but only to see that they are nicely cushioned. Strengthen the calves, and also look at the training - it might be that running 10km once in a while is a little infrequent. I'm not sure how much you are training between, but that may be partly to blame, and if you are a little more consistent, it may help.
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