Reconstruction with β-Tricalcium Phosphate for Giant Cell Tumor of Bone around the Knee

Giant cell tumor of bone is a locally aggressive metaphyseal lesion extending to the epiphysis, mostly occurring around the knee joint. Reconstruction to preserve the joint is difficult when there is little subarticular bone. Four such cases with a giant cell tumor of bone around the knee joint were treated by curettage and reconstruction using β-tricalcium phosphate (β-TCP). Block-shaped β-TCP with high mechanical strength (hard-type β-TCP) was implanted into the cavity, while standard β-TCP particles were put into the subarticular space. Exercise to promote improved range of motion was performed after the operation. The hard-type β-TCP is mechanically stronger than cancellous bone. Therefore, weight bearing can start around 3 months postoperatively when bone has been incorporated into the subarticular area but before complete bone incorporation into the lesion. This reconstructive procedure also provides excellent knee function.