Injured Knee in spin class

[Sylvia]

It sounds like what you have injured could definitely be related to the crank arm length, which affects pressure on your "Q angle," which is where your muscle attaches from your hip to your knee. Forgive me if I cannot remember the name of the specific muscle here! But, women have a wider Q angle than men, and often need shorter cranks because of this. Unfortunately, this is one thing your gym or spin studio cannot change, as the bikes are generally one size fits all.

Depends on the spin bike. Does it use standard pedal threads. Is the arm width roughly the normal width of a normal bike crank. I have a LeMond spin bike at home and have crank shorteners on it. If this ends up being something longer term, you could see if the gym would mind if you put crank shorteners on the bike when you ride. And maybe give the manufacturer of the bike a call and see if they think shorteners would be a problem.

Shorteners were discussed sometime back in this thread.