In 1923, I 1 reported a case of loose body under the external semilunar cartilage of the knee, cited here as case 1. Since then I have had one more similar experience. In the literature at my disposal I cannot find any mention of this condition and a knowledge of it seems important.
It is extremely trying for the surgeon to open the knee in search of a loose body which is definitely known to be present and which is well visible in all roentgenograms and then fail to find it. Able surgeons have been known to fail in locating and removing a loose body. To open a knee joint is always an operation of magnitude and not to succeed in accomplishing the desired object is a surgical disaster. The condition here cited may, or may not, be excessively rare. In my practice it occurred two times in about 150
GEIST ES. LOOSE BODY UNDER THE EXTERNAL SEMILUNAR CARTILAGE OF THE KNEE. JAMA. 1929;92(21):1751-1752. doi:10.1001/jama.1929.02700470027009