Dega served as an expert for the World Health Organization and was one of the founders of the Polish Orthopedic Society.
He created new apparatus and devices to help accident victims and survivors of polio, as well as new therapies and operations for congenital dislocations of the hip.
He was drafted into the Prussian army in 1915; after matriculating (by correspondence) from the medical faculty of the University of Berlin, he was assigned to a Münchengladbach hospital.
In May of 1940, he led the surgical ward of the Karol and Maria Children's Hospital, and provided medical assistance to insurgents and civilians after the Warsaw Uprising.
Dega became rector of the Poznań Medical Academy on 21 May 1959 and served until resigning on 1 October 1961 due to poor health.