Runners knee?

Has anyone here had this?
My knee has been very grumpy on and off for a few months now - mostly when descending stairs or twisting my leg to one side - a sharp pain behind the kneecap - also on full extension of the leg.
It seemed to flare up when riding anything other than my fixie (now SS) road bike. A ride or two on that soon cleared the problem up . I don't think it's down to saddle height etc on the other bikes - I've tried all that.
However,my leg strength has increased a lot over the past 6 months (due to the fixed) & I'm wondering if weak hamstrings/underdeveloped inner thigh muscles could be causing the kneecap to be out of alignment? I'ts' really frustrating - I've never been so fit and strong but my knee is bugging me.
Trouble is - it's more persistant now & I'm worried that grinding away on the SS (74") will aggravate it - although it doesn't hurt when riding and it still seems to help.....
Can anybody shed light on this at all?
My knee has been very grumpy on and off for a few months now - mostly when descending stairs or twisting my leg to one side - a sharp pain behind the kneecap - also on full extension of the leg.
It seemed to flare up when riding anything other than my fixie (now SS) road bike. A ride or two on that soon cleared the problem up . I don't think it's down to saddle height etc on the other bikes - I've tried all that.
However,my leg strength has increased a lot over the past 6 months (due to the fixed) & I'm wondering if weak hamstrings/underdeveloped inner thigh muscles could be causing the kneecap to be out of alignment? I'ts' really frustrating - I've never been so fit and strong but my knee is bugging me.

Trouble is - it's more persistant now & I'm worried that grinding away on the SS (74") will aggravate it - although it doesn't hurt when riding and it still seems to help.....
Can anybody shed light on this at all?
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Sitting with an ice pack on my knee as I type.
Flared up big style after a 13 mile run on Monday morning.
10mins of ice every couple of hours.
Ibuprofen
Arnica cream
No running for 2-4 weeks (depending on how quickly it settles down)
Hopefully able to spin on the bike by Monday
In the meantime I shall walk slowly to and from the the fridge & wine rack.
.
Road
Dirt
Fast
Make that 'chrondomalacia patellae'
And pursue the ideal
The planet becoming the hostess
Instead of the meal
Roy Harper - 'Burn the World'
Saw a physio and it is indeed the condition you describe - i've been mashing (well it's mashing for me anyway) a 44X16 for acoupla months on my SS.Ithought it would help me grow big Arnie thighs so I could make my riding buddies (who are all male & I'm female), cry as I flew off in to the distance..... ;-) My muscles are bigger...but my knee is unamused........and I have to spend a whole 7 days off the bike. ah well.....
Whoops :oops:
I'm considering going to see a physio to see whether there is anything that can be done (other than not kneeling down on it any more) that will help speed recovery.
What do I ride? Now that's an Enigma!