https://www.bluehillspt.com/Sports-A...4/article.html
Lat pull downs behind the neck are potentially dangerous and always unnecessary in your fitness or rehab plan.
The end range of upper extremity external rotation and abduction places increased stress on the inferior glenohumeral ligament. Add resistance and repetitions and you place one of the primary stabilizers of the joint at risk.
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In this study 10 rep max pull downs were looked at using four techniques:
close, neutral grip, front pull down
close, supinated grip front pull down
wide grip front pull down
wide grip behind the neck pull down
The results are summarized as follows. Front wide grip pull downs resulted in the highest latissimus EMG activity. There was no difference in the other groups. There was no difference in any of the grips for teres major activity. ( These results were the same for both concentric and eccentric portions of the lift). Rear deltoid activity was higher for all three front movements than for the behind the neck variation. (Eccentrically, the close grip had the greatest activity). Other muscles looked at were the pectoralis (close grip provided the most activity) and the triceps (wide grip front provided the most activity).