It seems your shoulder condition is all joint related condition associated with your shoulder. You are not going to get a separate evaluation for scapular dyskinesia as it is predicated on painful motion of the shoulder. To give you a separate 10 percent evaluation for the arthritis of the shoulder would be considered pyramiding as arthritis is also predicated on pain, which is the cardinal symptom of arthritis. That is not to say that 20 percent is the most you are going to get for your shoulder. You may eventually develop a nerve dysfunction which can be separately rated from joints. Joints and nerves can be separately rated but muscle and nerves may not and in most cases rated together.