Intraosseous Pseudotumor After Knee Viscosupplementation

What is it about?

A sixty-eight-year-old woman with osteoarthritis in the right knee who had received a single injection of a com- mercial hyaluronic acid preparation presented with an intraosseous mass that had not appeared in previous imaging studies. Open biopsy and curettage was performed, and a reactive pseudotumor related to viscosupplementation was diagnosed. At the last follow-up fourteen months after surgery, the patient had experienced no recurrence of the lesion.

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Why is it important?

Viscosupplementationisconsideredaconservativetreatmentoptionforearly-stagekneeosteoarthritis.To the best of our knowledge, this complication, namely an intraosseous mass, has not been described previously in the literature.