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Wear debris pseudotumor following total knee arthroplasty: a case report.

AbstractINTRODUCTION:
In patients who have undergone a total joint replacement, any mass occurring in or adjacent to the joint needs thorough investigation and a wear debris-induced cyst should be suspected.
CASE PRESENTATION:
An 81-year-old man presented with a painful and enlarging mass at the popliteal fossa and calf of his right knee. He had had a total right knee replacement seven years previously. Plain radiographs showed narrowing of the medial compartment. Magnetic resonance imaging showed a cystic lesion at the postero-medial aspect of the knee joint mimicking popliteal cyst or soft tissue sarcoma. Fine needle aspiration was non-diagnostic. A core-needle biopsy showed metallosis. Intraoperative findings revealed massive metallosis related to extensive polyethylene wear, delamination and deformation. Revision knee and patella arthroplasty was carried out after a thorough debridement of the knee joint.
CONCLUSION:
Long-term follow-up is critical for patients with total joint replacement for early detection of occult polyethylene wear and prosthesis loosening. In these cases, revision arthroplasty may provide a satisfactory knee function.
AuthorsAndreas F Mavrogenis, George N Nomikos, Vasileios I Sakellariou, George I Karaliotas, Panayiotis Kontovazenitis, Panayiotis J Papagelopoulos
JournalJournal of medical case reports (J Med Case Rep) Vol. 3 Pg. 9304 (Nov 29 2009) ISSN: 1752-1947 [Electronic] England
PMID20062793 (Publication Type: Journal Article)

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