It takes quite a hard physical effort to cock my crossbow. Thus a person with any shoulder problems must consider that.
I use a pulley device and pull both it's handles back at the same time to cock my Recruit Recurve crossbow. The pulley cocking device is marked Barnett and OMP.
It's hard to cock it pulling the handles back. A person with physical problems might not be able to do it without pain.
http://www.barnettcrossbows.com/acce...troke-up-to-15