Long-Term Functional Outcomes of Distal Femoral Replacements Compared to Geographic Resections for Parosteal Osteosarcomas of the Distal Femur.

Background: Parosteal osteosarcoma is a rare tumor with increased survival compared to conventional high-grade osteosarcoma. Due to this increased survival comes the need for reconstructive options that provide good long-term functional results. Current treatment methods include geographic resection with allograft reconstruction versus resection and reconstruction with a distal femoral replacement.
Purpose: Our purpose was to compare the long-term functional outcomes of distal femoral replacements to allograft reconstructions, using the musculoskeletal tumor society (MSTS) scoring system.
Methods: After querying our database, 12 patients were identified and completed a MSTS questionnaire.
Results: There was no difference in functional outcomes between the cohorts at an average of 14 years follow up for the endoprosthetic group and 25 years of follow up for the geographic resection group.
Conclusion: At long-term follow-up, patients who undergo a distal femoral replacement for a parosteal osteosarcoma have no difference in functional outcomes compared to those who undergo an allograft reconstruction.Level of Evidence: IV.