the purpose of this study is to assess whether bone resection for thigh soft tissue sarcoma with cortical involvement of the adjacent bone result in better local control and survival compared to sub-periosteal dissection. Investigators also aim to find out the prognostic factors for clinical outcomes in this group of patients.

Inclusion Criteria:

1. Patients developed thigh soft tissue sarcoma, defined as lesion located below the plane of the lesser trochanter and above the plane of the femoral condyle.
2. received primary limb-salvage surgery at our center.
3. soft tissue sarcoma with only cortical contact of the adjacent bone based on preoperative imaging
4. minimum of 2-year follow up

Exclusion Criteria:

1. diagnosis was well differentiated liposarcoma
2. patients with metastatic disease at the time of presentation
3. soft tissue sarcoma displayed frank osseous invasion (eg. medullary canal invasion)

Patients displayed with thigh soft tissue sarcoma with only cortical contact of the adjacent bone and underwent limb-salvage surgery were included for the study. Patients could be divided into two groups: 1) sub-periosteal tumor excision group and 2) composite bone resection and reconstruction group.