Hi Sarah
I'm not sure if you can give an answer just on a few facts but I thought it was worth a go.
I'm training for VLM. Training has been going well, I'm following the RW sub 3.30 plan. Hit 50miles in a week, completed the first 20miler. After a Sunday 20 miler I was fine. Rested on Monday and Tuesday did a 5 mile tempo session. Again, no problems. Then by weds afternoon i had a strange sensation in my knee which was moving around a lot - up my quad to my glutes. A little pain, something not quite right. I did the sensible thing and rested for a week. After that I did a slow 4miler and the next day had a bad case of DOMS. The problem hadn't gone away..
I had a sports massage last night at Birm Uni, they didn't see any particular issues, just recommended I do foam rolling.
It's probably a biomechanics issue as I know one leg is slightly shorter than the other - (neutral in one foot and pronate in the other!) I have been doing pilates for a while now which is excellent. But I can't afford to keep resting!!
I'm wondering whether it could the trainers. I'm on 375 miles in my asics 1160s. The supersix team last year at the selection day recommended them for me and I've never had problems before. In your experience can a simple thing as replacing shoes really help? I thought 375 miles was still ok. Perhaps they do need changing. At the moment I'll try anything!
Any guidance would be appreciated. Thank you.