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The Journal of Bone and Joint Surgery 80:452-3 (1998)
© 1998 The Journal of Bone and Joint Surgery, Inc.

Correspondence

Correspondence

Jonathan Cohen, M.D., Thomas P. Schmalzried, M.D., Alexander N. Fedenko, M.D., Joseph Mirra, M.D. and Kenneth H. Akizuki, M.D.

TO THE EDITOR:

"The Role of Access of Joint Fluid to Bone in Periarticular Osteolysis. A Report of Four Cases" (79-A: 447–452, March 1997), by Schmalzried et al., regarding four cases of osteolysis of the hip, raised two concerns. One was the authors' acceptance and promotion of the term geode to identify the osteoarthrotic cysts, and the other was their pathophysiological interpretation of the genesis or enlargement of these cysts.

In geological terms, a geode is a nodule found mostly in limestone after solution of the mineral, with deposition of a beautiful array of crystals in the cavity. The term should not be applied to osteoarthrotic cysts, despite the popularization of its use, mostly by radiologists, during the last two decades or so. The geological process emphasizes the deposition, not the formation of the cavity, even though part of the cavity may persist after deposition. In contrast, with cysts, the . . . [Full Text of this Article]


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