I have an MRI on my shoulder today,and I see the ortho on Thurday for results. Is arthritis genetic? Why do some of us have many joints involved while others don't have any? Ortho asked me if I'd had any repetitive motion jobs like a factory line! I was a preschool teacher and a bookeeper. I can't find any reason why my shoulder joint is deteriorating! I cook, I clean, and do some gardening. No heavy work. My finger joints have bone spurs too, making my fingers crooked. I am only 46! First my back,then my neck,then my toes,then my fingers,now my shoulder. WHAT IS GOING ON HERE? I am worried for my future. I was planning on being the "Bionic Grandma" in the second 1/2 of my life. Kicking butt and taking names!!!