Chalky joint effusion. The result of massive synovial deposition of calcium apatite in progressive systemic sclerosis

Arthritis Rheum. 1977 Apr;20(3):792-6. doi: 10.1002/art.1780200305.


A patient with long-standing progressive systemic sclerosis developed calcification of the suprapatellar pouch. Chalky white synovial fluid from the knee joint contained many crystals that were characterized as apatite by X-ray diffraction. In this case massive amounts of cystals were presumably shed into the fluid from the heavily calcified synovium.

Publication types

  • Case Reports
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Apatites / analysis*
  • Calcinosis / metabolism
  • Female
  • Humans
  • Scleroderma, Systemic / metabolism*
  • Synovial Fluid / analysis
  • Synovial Membrane / analysis*


  • Apatites