[Delayed diagnosis of osteosarcoma in adults: a prognostic factor to be considered].

Introduction: different variables have been associated with a worse prognosis of patients with osteosarcoma (OS), highlighting tumor size, location in the axial skeleton and the presence of metastases. The objective of this study is to analyze the prognostic impact of diagnostic delay in osteosarcoma in adults in the Mexican population in a center specialized in sarcomas.

Material And Methods: retrospective cohort study from January 1, 2005, to December 31, 2016, 96 patients over 21 years of age with a diagnosis of osteosarcoma were analyzed.

[Prognostic factors associated with failure of modular knee arthroplasty in oncologic patients].

Introduction: reconstruction of large bone defects using modular knee arthroplasty (MKA) presents a significant challenge in terms of functionality. The objective of the present work was to identify the different prognostic factors associated with failure of MKA in cancer patients.

Material And Methods: a retrospective cohort study was conducted, including patients with a diagnosis of musculoskeletal tumor in the distal femur or proximal tibia, who underwent MKA between January 1, 2010, and December 31, 2021.

[Surgical margins as prognostic factor in pelvis chondrosarcoma. Cohort study in a sarcoma unit].

Introduction: chondrosarcoma is the second most common primary malignant tumor, constitutes approximately one quarter of all primary bone sarcomas. Surgical margins in pelvic chondrosarcoma have a direct impact as a prognostic factor, both on overall survival and on recurrence-free survival of this disease.

Objectives: to analyze the impact of surgical margins as a prognostic factor in pelvic chondrosarcoma.