. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 7. Thickening in semilunar. Fig. 8. Os trigonum. Fig. 9. Secondary os calcis. ately rare in the adult (). It is a per-fectly formed little bone like a must not be confused with a fracturedstyloid. In the latter the rough edge of thefracture is evident. In old cases of fracturethe rough edge disappears, but the styloidremains deformed. Examination of both wrists should bemade when the presence of an extra bone issuspected, and if it is present on one side itwill usually be found on the other sid
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 7. Thickening in semilunar. Fig. 8. Os trigonum. Fig. 9. Secondary os calcis. ately rare in the adult (). It is a per-fectly formed little bone like a must not be confused with a fracturedstyloid. In the latter the rough edge of thefracture is evident. In old cases of fracturethe rough edge disappears, but the styloidremains deformed. Examination of both wrists should bemade when the presence of an extra bone issuspected, and if it is present on one side itwill usually be found on the other side. Fig-ure 3 shows an extra long styloid appearance is caused b> the fusion ofthe OS triangulare with the styloid of the styloid process is very com-mon, but a true os triangulare is moderately rare. Comparison of right and left wristseasily settles the (iuestion when one wrist(3nly has been injured. Figure 4 shows afractured styloid and an os triangulare. The ulnare externum is a very rare bonein nn- exi)erience. I have seen it only
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