Comparison of Local and Intravenous Zoledronic Acid on Histopathology and Recurrence Rate after Extended Curettage in Giant Cell Tumors of Proximal Tibia: A Prospective Study

INTRODUCTION: The bone pathology-giant cell tumor (GCT) is a locally aggressive and recurrent lesion. A bisphosphonate-zoledronic acid (ZA) has been known to lower the recurrence and resorption in similar bone lesions. Hence, we evaluated the effectivity of the ZA for the GCT of the proximal tibia. MATERIALS AND METHODS: We piloted a prospective clinical observational study. We included 100 subjects with GCT, who were divided into two equal groups of case (given ZA) and control (no ZA). The histopathological features and the recurrence rates along with other findings were compared with P < 0.05 deliberated as significant. RESULTS: We observed that for in the case group, calcification and fibrosis that were beneficial were observed. Reduced giant cells and lower recurrence rate are seen in the case group. No significant variation in the functional outcome was seen between the groups. CONCLUSIONS: ZA was shown to have beneficial effect on the outcome for the treatment of the GCT.