BACKGROUND: Bone giant cell tumor (GCT) is one of the least frequent, most controversial and least predictable tumors in its behavior. We present a case of GCT in the lower limb, which implied the distal femur. The diagnosis required a previous biopsy before proceeding with its en bloc resection, and treatment based on bone allograft. CASE REPORT: Male patient of 43 years of age, mestizo, with no relevant personal or family history. He went to the oncology orthopedics outpatient clinic for presenting a hard and painful mass with gradual increase in size at the level of the right knee, deformity, functional limitation and crepitus in that region, which is why he attends his assessment. EVOLUTION: The patient underwent a lesion biopsy at the level of the distal femur with a pathological anatomy report of giant cell tumor. Bone resection was performed at the tumor level and treatment was performed by allografting the bone structural allograft. A 2-year follow-up was performed and a score of 14/15 according to the Makin scale was obtained as functional results. Osteointegration of the graft to autogenous bone was also evidenced. Excellently at 15 months. We did not find infection, graft resorption or fatigue of the material. CONCLUSIONS: Limb preservation surgery represented by structural allografts is a favorable technique with adequate functionality and osteoingration, increasing the life expectancy of our patients and future revision possibilities. Avoiding amputations, arthrodesis or tumor prosthesis whose cost benefit with the subsequent years end up being high and deteriorating the quality of life in the patient.
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