Abstract
It is well known that hydroxyapatite is a useful biomaterial with biocompatibility and nontoxicity in the reconstructive field of orthopedic surgery.We report a case with suspected pes anserinus bursitis or enthesopathy caused by hydroxyapatite. A 56-year-old woman suffering from renal sarcoidosis with bone defect of the left medial tibial condyle underwent operation for hydroxyapatite 3 years ago. At this time, though the hydroxyapatite spilt and fell in the operation field, no symptoms were seen for 3 years.Because of recurring sharp pain in the same area, we thought that this pain was caused by hydroxyapatite, and we removed the hydroxyapatite, after which the sharp pain disappeared.Histologically, foreign body gaint cells around the hydroxyapatite particle were observed, but no inflammatory reaction and calcification were seen.
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