Physiologically,there will be too much tension on the joints. The articular capsule needs support when lifting, this comes from the surrounding ligaments etc. Relaxing at the top end, or locking out will mean supporting tension is minimul, this is where you are at greater risk of injury.
my friend was out for about a year with knee trouble with locking out,pausing, trying to push out another rep.
When training it is set to failure, not set to
wait till i get a break and do one more. This way less damage and less time with injury.
My view is squat with a spot.
