Stretch your hip flexors, quads, and maybe even your IT band and do some foam rolling too. I used to get the same problem when I sumo’d.
If it happens again i might switch back to conventional. I have been foam rolling and stretching alot actually. But if they keep messing with my squat im just gonna switch back. Id rather squat and deadlift than just sumo deadlift
Could be that you just need to ease into the sumo deadlift a little slower. That whole take 1 step back so you can take 2 steps forward thing. Even if you’re able to move the weight doesn’t mean that all the muscles and structural support is where it needs to be to pick up the weight. I bet this is especially true if you’ve been pushing your sumo pull hard and did it all of a sudden.
Going with a semi sumo pull might help you out too.
I believe mine is a semi-sumo its about 3 inches outside shoulder with. Half way between the smooth and where the ring usually is. I did jump into it pretty fast. I went from starting it with a 385 working max to get into the swing of them to pulling 475x3 then on the same week i did defecit sumo pulls at 385 3x3 after conventional of 455x3. I might just try working off a 405 training max and stick with that till i feel better and become accustomed to the lift.
I never wanna feel again what i felt today in my legs. I actually had to do a deload today on squats because of it. Even warming up with 135 hurt like hell it felt like i had zero leg strength and the pain was shooting through both legs.