With an interest in degenerative and inflammatory conditions I do "mini-open" procedures. There are some short term benefits to keyhole surgery in the shoulder but in the longer term most studies show that open surgery remains the "gold standard". A mini-open procedure is where the cut on the shoulder is 5cm or less.
I am an experienced knee arthroscopist and the largest incision for my routine knee ligament (ACL) reconstructions is 4cm. This is to "harvest"/take the hamstring graft. The rest of the surgery is all keyhole.