[Roentgenology in rheumatology]

The paper takes a retrospective view back to the historical beginning of roentgenology. The development of radiology of bone and joints is high-lighted with special respect of rheumatology. Completeness was not intended regarding the size of this paper. It is shown, especially to our younger colleagues, how hard it was in the past 90 years to achieve our today-knowledge in x-ray-diagnostic. Three factors determined Roentgenology to become an indispensable method. The continuing development and improving of efficient x-ray-machines. The development and improving of investigation methods. The scientific workup of radiological signs leading to radiomorphologic features. Some milestones of technical development of conventional radiology are listed up. Also, innovations in microelectronics. Computed tomography and Magnetic Resonance are listed up. Remarks are made about costs of "big machines" and about declining knowledge in conventional radiology in young american radiologists. Recommendations are made for efficient collaboration of rheumatologists and radiologists.