It turns out i've damaged the medial ligament in my left knee. Funny really as i had an ace day out on Sunday on a friends Beneteau 285 and the pain seemed to ease either that or as i think was the case i was still drunk from the night before.
Still we had 8.5 knots of boat speed at one point but i did have it on her ear the entire time from Cowes back to Ocean Village, great fun though getting into an impromptu race with a Sadler 29 and a Dufour 325, we beat the Dufour and had caught the Sadler up but then he unfurled his genoa and left us for dead.
However after getting home i sat down for an hour or so then went to get up and realised i could hardly walk and it just got worse throughout Monday, i remember it hurting when i got up from tabbing in a bearer for the gas locker bulkhead but thought nothing of it.
So i've been told to rest my knee for a week or two which is a bit of a pain as all the work for the foreseeable future requires crawling around on my hands and knees.