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Introduction: Malignant bone tumors in adolescents and young adults are relatively rare, with osteosarcomas, chondrosarcomas, and Ewing's sarcomas being the most representative. However, primary malignant neoplasms in the foot are even rarer, with calcaneal osteosarcoma representing less than 1% of the total osteosarcoma locations. Various salvage surgery strategies have been reported, including the use of allografts and vascularized flaps for calcaneal reconstruction, as well as partial or total calcaneal replacement, all with good functional outcomes. Case presentation: An 18-year-old young adult, with no pathological history, he was diagnosed with an osteoblastic osteosarcoma of the calcaneus. As part of the limb salvage surgery, a total calcaneus replacement was proposed using a custom-made porous titanium prosthesis printed in 3D. Conclusion: The replacement of the calcaneus following resection for osteosarcoma remains an area of innovation in oncological surgery. The few reported cases highlight the viability of custom prostheses as a promising alternative to preserve function and improve the quality of life for patients.

Dario Sebastian Arcos Lucero