Van Ness Surgery in Osteosarcoma of the femur. Case report with more than 5 years of evolution with literature review.

Patient 17 years old, diagnosed with osteosarcoma in right distal femur, stage IIB (MusculoSkeletal Tumor Society), without distant bone involvement, multiple personal history, received chemotherapy treatment presenting a low percentage of necrosis with complications, it was decided to perform Van Ness surgical technique in 2018, technique in which resection is performed in tumor block plus rotationplasty, describing its importance in our patient and how this surgery allows greater adaptability to their daily life both social, family as well as school, using Toronto Extremity Salvage score for evaluation.