About Delaware Arthritis. Delaware Arthritis is a rheumatology practice located in Lewes, Delaware and Millville, Delaware. Under the medical direction of board-certified rheumatologist Jose A. Pando, MD, Delaware Arthritis is dedicated to providing comprehensive and compassionate care that focuses on a patient's whole health, not just the symptoms or disease.About Practice‧Providers‧Services‧Testimonials‧Contact‧Arthritis.