I'm sure that this is the single most damaging movement in weightlifting. Let's see:
- The sudden stop at the top is especially bad for the arm joints (wrist, elbow, and shoulder). Compounded by the fact the the weight lifted is the heavier one.
- If you have groin strain/pull, forget about jerking because your hip joint where the trailing leg attaches will cry. It's still possible though to split jerk if the pull is only on one side (like my case).
- It damages the ankle joint of your trailing leg.
I can attribute all of my injuries (thankfully only minor right now) to jerking, except the groin pull. I pulled my right one because I was stupid and did sumo deadlift for some time.