I know some 100m sprinters and High jumpers used/use a set of of 60-80% 1rm squats about 10-15 minutes before competing for the Post-activation-potentiation effect. Although there are still debates on how effective this actually is, as studies have shown variable results, though most are at least positive to a minor degree when the rest period between is short.
@Zacheryah
Quite a few sprinters have used bench/box squats to half depth or just about thighs parallel instead of ass to grass. Charlie Francis had Ben Johnson doing box squat sets of 6 reps at 560lbs during his strength phases. I've seen videos of Asafa Powell and a couple other sprinters doing them in strength training phases as well. Any reason sprinters would do these specifically?
With regards to injuries, there was a study in the 80s on powerlifters and Olympic lifters squatting deep and whether it caused increased joint/tendon/ligament issues in the hips and knees. I seem to recall it showed minor issues increasing, but nothing much so far as long term degenerative damage in the joints.
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There was also this review released from Cal State centre for sport performance:
https://shruggedcollective.com/wp-content/uploads/2015/04/DeepSquat-Review-Barbell-Daily-3-27-15.pdf
Suggests that deep squats are not problematic for healthy individuals free of neuromuscular injury.