Normal variability in the age and first onset of ossification of the triquetral.
D000367:Age Factors; D002675:Child, Preschool; D005260:Female; D006225:Hand / Q000000981:diagnostic imaging*; D006801:Humans; D007223:Infant; D008297:Male; D010012:Osteogenesis; D011859:Radiography; D014953:Wrist / Q000000981:diagnostic imaging*