Fig. 6From: A case of bilateral revision total knee arthroplasty using distal femoral allograft–prosthesis composite and femoral head allografting at the tibial site with a varus-valgus constrained prosthesis: ten-year follow upHistology of synovial tissue with macrophages, giant cells (black arrows), and giant cell- polyethylene particles (black arrowheads). a Hematoxylin-eosin staining (× 10), b Immunohistochemical staining for CD-68 (× 10)Back to article page