He graduated in medicine in 1976 from the University of Brasília (UnB), performed his orthopedic residency at the Hospital Sarah, and completed a further specialization in physiatry.
[3] He gave the first description of a case of iatrogenic pectus deformity due to the injury of these growth plates in connection with a cardiac operation in which a sternotomy was performed on the immature skeleton.
[2][5] At the Alfred I. duPont Institute, a pediatric orthopedic hospital in Wilmington, Delaware in the United States,[6] he treated children and adolescents with different types of pectus deformities with a dynamic chest compressor orthosis.
[7] In 1995 Haje put in place a treatment program that allowed patients to receive his orthoses without cost in public hospitals in Brasília.
Until this time, except for the pioneer papers of Haje and coworkers, no other medical authors had supported a non-operative approach for the treatment of these patients.