A 32-year-old man underwent intralesional curettage with allograft for a giant cell tumor of the proximal tibia 18 months ago. He now presents with recurrent pain and swelling at the surgical site. Plain radiographs show a new radiolucent lesion at the margin of the previous curettage site. MRI confirms recurrent GCT with cortical thinning. What is the most appropriate next step in management?

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