Abstract

Parosteal osteosarcomas are rare low-grade bone tumors arising from the periosteum that present most commonly in the posterior distal femur. Parosteal osteosarcomas are typically slow growing and managed with wide resection. We present a 10-month post-partum patient with a painful mass of the right proximal tibia that rapidly enlarged in the post-partum period. Parosteal osteosarcomas are typically easily detectable by x-ray and then confirmed by incisional biopsy. In this case report, we describe a surgical technique to address tumors of the proximal tibia via proximal tibia replacement with consideration to preserve optimal knee function. Three-month follow-up of demonstrates no recurrence, a functional implant, and knee range of motion of 20-85 degrees.