The most common site of calcium hydroxyapatite deposition in the wrist is in the flexor carpi ulnaris tendon. Flexor carpi ulnaris calcium hydroxyapatite deposition is also known as peritendinitis calcarea, periarthritis calcarea, calcific tendinitis, calcific bursitis, and calcareous tendinitis and bursitis.
Calcium hydroxyapatite deposits can be found anywhere along the tendon, but most commonly occur near its attachment to the pisiform. Lateral radiographs characteristically reveal amorphous calcification proximal to the pisiform. Localized obliteration of the adjacent soft tissue fascial planes can be seen in the acute phase.
Case courtesy of the New England Baptist Hospital.
References
- Gandee RW, Harrison RB, Dee PM. Peritendinitis calcarea of flexor carpi ulnaris. AJR Am J Roentgenol. 1979 Dec;133(6):1139-41.
- Steinbach LS. Calcium pyrophosphate dihydrate and calcium hydroxyapatite crystal deposition diseases: imaging perspectives. Radiol Clin North Am. 2004 Jan;42(1):185-205, vii.
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