. The American journal of roentgenology, radium therapy and nuclear medicine . w^ Fig. 10. Tibiale externum. Fig. II. Os vesalianum. 572 Extra Bones in the Wrist and Ankle Found bv Roentg^en Ravs toes. It is really the posterior externaltubercle of the astragalus. It is by far themost frequently seen extra bone of the 8 shows the os trigonum. It may beshort and stout or long and slender. The secondary os calcis is a small bonewhich is occasionally found in the angle be-tween the OS calcis, the astragalus and thescaphoid. Figure 9 shows a specimen of thisbone. It corresponds to
. The American journal of roentgenology, radium therapy and nuclear medicine . w^ Fig. 10. Tibiale externum. Fig. II. Os vesalianum. 572 Extra Bones in the Wrist and Ankle Found bv Roentg^en Ravs toes. It is really the posterior externaltubercle of the astragalus. It is by far themost frequently seen extra bone of the 8 shows the os trigonum. It may beshort and stout or long and slender. The secondary os calcis is a small bonewhich is occasionally found in the angle be-tween the OS calcis, the astragalus and thescaphoid. Figure 9 shows a specimen of thisbone. It corresponds to the os centrale in thehand. The tibiale externum is found at the with the bone of the other side. Figure 11shows an os vesalianum. It is seen best in ananteroposterior view. The last bone I have to mention is anossicle with no name. I first noticed it fiveyears ago and have been watching for itsince. I ncnv have 14 cases of it. I havefound it in Ijotli feet in 4 cases. These arethe onl}- cases I have examined on bothsides especially for this bone. After finding afew cases, I cons
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