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A Novel 3D-Printed Strut-Type Prosthesis Reconstructs the Hemicortical Defect After Distal Femur Parosteal
Jianhua Mu1, Yitian Wang1,2, Han Liu1
1Department of Orthopedics, Orthopeadic Research Institute, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China.
Orthopaedic Surgery
|June 19, 2026
Summary
A novel 3D-printed strut-type prosthesis (3DPSP) effectively reconstructs distal femur defects in parosteal osteosarcoma (PAOS) patients. This approach shows promising mid-term results with restored limb function and good bone integration.
Area of Science:
- Orthopedic oncology
- Biomaterials engineering
- Surgical reconstruction
Background:
- Parosteal osteosarcoma (PAOS) is a rare, low-grade malignant bone tumor often affecting the distal femur.
- Traditional reconstruction methods like distal femoral replacement (DFR), autografts, and allografts have limitations including functional sacrifice and poor bone union.
- 3D-printed prostheses offer a potential solution for reconstructing complex bone defects.
Purpose of the Study:
- To design and evaluate a 3D-printed strut-type prosthesis (3DPSP) for hemicortical defects in distal femur PAOS.
- To compare the mid-term clinical outcomes of 3DPSP reconstruction with traditional DFR.
Main Methods:
- Retrospective analysis of 12 distal femur PAOS patients (April 2018-January 2021).
- Six patients underwent distal femoral replacement (DFR), and six received 3D-printed strut-type prosthesis (3DPSP) reconstruction.
- Outcomes assessed included oncology status, defect length, knee range of motion, Musculoskeletal Tumor Society (MSTS) scores, complications, prosthesis stability, and osteointegration via X-ray and T-SMART.
Main Results:
- Average follow-up of 42.1 months.
- The 3DPSP group showed significantly less intraoperative blood loss (175.0 mL) and superior functional recovery (knee ROM 0°-123°, MSTS score 28.3/30) compared to the DFR group.
- Favorable bone-prosthesis integration was observed in the 3DPSP group.
Conclusions:
- A novel 3D-printed strut-type prosthesis (3DPSP) is an effective option for reconstructing hemicortical defects after distal femur PAOS resection.
- 3DPSP demonstrates potential for restoring limb function and achieving good bone-prosthesis integration in the mid-term.
- Further long-term studies are warranted to validate the efficacy of this novel prosthesis.
