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INTRODUCCION: El quiste oseo aneurismatico es una neoplasia benigna que aparece con mayor frecuencia en la segunda decada de vida. Clinicamente se presenta como una masa que produce dolor y deformidad de la extremidad afectada; radiologicamente se caracteriza por lesiones liticas con tabicaciones internas y abombamiento de la cortical. Se presenta un caso donde se realizo un aloinjerto estructural para el tratamiento de esta patologia.CASO CLINICO: Paciente de sexo masculino, de 18 anos de edad; con historia de 5 meses de evolucion de dolor e impotencia funcional de extremidad inferior derecha; al examen fisico se evidencio masa de 15 x 6 cm en tobillo derecho. La radiografia simple demostro una lesion litica de tercio distal de perone con adelgazamiento e insuflacion de la cortical. El examen histopatologico fue positivo para celulas gigantes de tipo osteoclasto, cambios simplasticos, estroma miofibroblastico y extravasacion eritrocitaria; datos compatibles con quiste oseo aneurismatico. EVOLUCION: Se realizo la reseccion en bloque de la masa tumoral del perone, para la reconstruccion se utilizo un aloinjerto estructural mas estabilizacion con placa de compresion dinamica y tornillo transindesmal; se realizo ademas una reconstruccion ligamentaria utilizando la tecnica de Watson Jones. El paciente tuvo una evolucion favorable, a los 16 meses del procedimiento se observo consolidacion completa, ademas de una funcion articular conservada; no se evidencio recidiva en los 5 anos posteriores de control.CONCLUSION: El quiste oseo aneurismatico es una patologia benigna que siendo tratada en etapas iniciales, conlleva un mejor pronostico y requiere de la realizacion de procedimientos quirurgicos menos complejos. En pacientes con tumores de gran tamano no es posible la realizacion de tratamientos convencionales; siendo la reseccion en bloque mas la colocacion de aloinjerto y estabilizacion ligamentaria, una alternativa terapeutica valida que permita preservar la extremidad. ABSTRACT BACKGROUND: Aneurysmal bone cyst is a benign neoplasm that presents more frequently in the second decade of life. Clinically It manifests as a mass that causes pain and deformity of the affected limb; radiologically, it is characterized by lytic lesions with internal septations and bulging of the cortex. A case is presented where a structural allograft was performed for the treatment of this pathology. CASE REPORT: 18 year-old male patient, with 5 month history of pain and functional impotence of right lower extremity; physical examination revealed a 15 x 6 cm mass in right ankle. X-ray showed a lytic lesion in the distal third of the fibula, with thinning an insufflation of bone cortex. The histopathological report was positive for giant cells (osteoclast-like cells), symplastic changes, myofibroblastic stroma and erythrocyte extravasation; data compatible with aneurysmal bone cyst.EVOLUTION: An en-bloc resection of the fibular tumor was performed, for the reconstruction a structural allograft plus stabilization with dynamic compression plate and transindesmal screw was used; a ligament reconstruction was also performed using the Watson Jones technique. The patient had a favorable evolution, at 16 months complete consolidation in addition to a preserved joint function was observed; there was no recurrence in the 5 years after control.CONCLUSION: The aneurysmal bone cyst is a benign condition that if treated in initial stages, has a better prognosis and requires less complex surgical procedures. In patients with large tumors, conventional treatment is not possible; en bloc resection plus allograft placement and ligament stabilization, is a valid therapeutic alternative to save the limb.

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.