As a person who has experienced overuse injuries, and a lot of them, it all comes down to individual body mechanics.
I used to ride inside. Trainers in the basement and seasons of spin classes. I have found I can’t ride inside. My issues flare very quickly when I ride inside. It’s from not changing positions. I have found I ride inside very differently than i ride outside. I sit too long, push a harder than needed gear, and if I get out of the saddle, it is definitely not the same. Spin bikes don’t move around you, you move around it. And unless you are rocking your trainer in your basement side to side, you aren’t doing what you do on trail or road. That stationary situation, for me, is a recipe for disaster. Those small adjustments I make riding outside, stopping while coasting, leaning and moving around while cornering, getting out of the saddle to get up a hill all contribute to a better situation for my mechanics. I need to move around. If I sit and grind with no variation, I get injured. My joints and bursa send a message to stop.
To claim it’s just bike fit is not the case, unless your body’s mechanics work that way. None of this stuff is one size fits all.
After research, visits to orthos and PTs, and taking the long road back to being able to ride regularly, a bit of unsolicited advice: if you are experiencing discomfort, don’t let it get to pain. Pain is too late. And working through that kind of pain gets you nowhere but off the bike for extended periods.
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