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We present a case in which the growth of an intraosseous cyst arising from the proximal tibiofibular joint appeared to have been increased by polyethylene wear particles from a medial unicompartmental knee replacement. Histological examination of the cyst wall showed a histiocytic response associated with numerous polyethylene wear particles. This case demonstrates that there is a direct communication between the joint cavity and the cyst. Such communication is probably through openings in the articular cartilage large enough to allow the passage of these particles.

Original publication




Journal article


J bone joint surg br

Publication Date





990 - 993


Aged, Arthroplasty, Replacement, Knee, Bone Cysts, Foreign-Body Reaction, Humans, Knee Prosthesis, Male, Osteoarthritis, Prosthesis Failure, Reoperation