Some might know of this but for those who don't...this might help...my right elbow was always a tad tender...rotators always kinda sore...till it hit me...I spend a lot of time in my office chair at work. I looked at my right arm pad and its getting worn out from use...the left one looks new.
I experimented and removed both arm rests. In a few days from letting my arms hang "naturaly" the pain in my shoulders is reduced and so is the elbow...same goes for leaning your elbows into the car door and center console while you drive. Try it out and let me know!