Your Erectus Spinae (lower back) should keep you stabilised during Bent-Over Barbell Rows. If you have to use momentum (swing), the weight is either too heavy or your lower back is not up to the task.
A great exercise for the lats and mid-traps, Bent-Over Barbell Rows. If you find discomfort on your wrists during this exercise, you may wish to consider a reverse-grip or neutral-grip using a swiss bar or GLOBE GRIPZ™.
Exercise image from Gym Professor Shuffle free-to-download gym workout app.