Roughly one center appears per year from the age of 1 year to 7 years, anti-clockwise in right hand and clock-wise in left hand looking from the anterior surface, i.e. from ulnar side to radial side. Pisiform, being a sesamoid bone it gets left behind and only develops years later.
- capitate: 1-3 months
- hamate: 2-4 months
- triquetrum: 2-3 years
- lunate: 2-4 years
- scaphoid: 4-6 years
- trapezium: 4-6 years
- trapezoid: 4-6 years
- pisiform: 8-12 years
Also it’s nice to know the appearance of ossification center of:
- Distal radius: 1 year
- Distal ulna: 4-5 years
If that didn’t work for you, try this mnemonic
Camera Has Three Lens, So Take Three Photos.
Also, if you’ve been having hard time remembering if the location of trapezium and trapezoid, just remember that the trapeziUM is towards thUMb and trapezoID is insIDe.
It can be a bit daunting to remember this, specially because different books mention different timelines.
If you were like me, getting confused with the volume overload, forget everything else. Just remember this one image. Thank me later!
Hope that mnemonic helped. Got a better mnemonic for the same? Let us know in the comments below.
Also check out these medical mnemonics.