I hope it comes from the shoes, technique... well, it didn't really change didn't it? I played for many years before without ever having this problem. Since I changed the shoes, I would guess this is the cause. But I will see in a few days
One thing to note: it isn't necessarily wrong technique that would cause knee problems. In TT good technique is simply hard on the knees because of the rotational force of the hips in a loop.
Think about how many WR top 50 TT players you have seen playing over the years with some form of knee support. Particularly that thin strap that goes right under the knee. There was one point in 2011 where there were four guys on CNT who were wearing those for knee conditions at the same time.
A few questions.
How long after you started using the new shoes did you start feeling the knee problem? Right away? Shortly after? Or more than 3 weeks after?
Did you start off not liking the shoes or liking them?
One more detail I want you to be prepared for:
Even if it was the shoes, it is possible that the knee recovering fully will take a while even if it is not bothering you right now. If there was some damage to your knee, regardless of the initial cause, the actions required, particularly for footwork and a TT FH stroke put a lot of stress on the knees. And it could take a while for the injury to fully heal.
I hope that is not the case. I hope you are back in action with footwear that better suits your needs ASAP. But I just think it is worth knowing that our knees don't really like the kind of torque that they are placed under in most racket sports. And in TT you are on an indoor surface and take many more strokes per minute or hour than in a sport like, say, tennis.
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