Saturday, July 4, 2009

BONE SCAN OF THE HANDS and FEET


The mnemonic to remember the hand bones is:
"some lovers try positions that they can't handle"
&
"trapezium to the thumb"

proximal row: scaphoid, lunate, triquetrum, pisiform
distal row: trapezium, trapezoid, capitate, hamate

In the first four days after a fracture, a bone scan can be negative. This is because it takes that long for enough osteoblasts to show up on a scan, to become activated.



The mnemonic to remember the foot bones is:
3 cuneiforms make up the medial foot distal row
cuboid the lateral foot distal and middle row
navicular the medial foot (big toe side) middle row
calcaneus the lateral side of the proximal row and talus the medial side of the proximal row.

So,

cccC
(a)N(d)
CT

...or the navicular/boat sails on the C's.

Here are some classic images.
Talonavicular joint arthritis:



2. If have all of the carpal bones hot then think of an INFLAMMATORY ARTHRITIS, one type of which is GONOCOCCAL. Therefore, do a whole body scan.
Other things to know are:
Low frequency gives fuzzy objects an a fuzzy background.
High frequency filters give crisp images with a lot of noise

No comments:

Post a Comment