In an article published several years ago,1 I pointed out the value of injecting oxygen into joints before subjecting them to roentgen-ray examination. I indicated how this method may be employed to advantage in various joints, described a simple technic and reported specific instances wherein this procedure aided in establishing a diagnosis or was the only means that enabled us to recognize and define the pathologic changes. So far, pneumarthrosis has proved of greater and more frequent benefit in the study of the knee than of any other joint.
For want of more accurate information, we have been compelled in the past to group many obscure lesions of the knee joint in the category of internal derangements. As our knowledge in differential diagnosis improved, we removed from this class cases of loose internal semilunar cartilage, injury of the crucial ligaments, fracture of the tibial spine, chronic hypertrophic villous synovitis,
KLEINBERG S. PNEUMARTHROSIS AS A DIAGNOSTIC AID: REPORT OF A CASE OF LOOSE INTERNAL SEMILUNAR CARTILAGE. Arch Surg. 1924;8(3):827–830. doi:10.1001/archsurg.1924.01120060124008
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