Total talar replacement with a novel 3D printed modular prosthesis for tumors

Area of Science:

• Orthopedic Oncology
• Biomaterials Engineering
• Surgical Reconstruction

Background:

• Arthrodesis is a common treatment for talus tumors but often leads to poor limb function.
• Novel reconstruction techniques are needed to preserve ankle function after talus tumor resection.

Purpose of the Study:

• To present a novel reconstruction method for talus tumors using a 3D printed modular prosthesis.
• To evaluate the efficacy of this technique in preserving ankle function.

Main Methods:

• A 43-year-old female with mesenchymal sarcoma of the talus underwent en bloc resection.
• Reconstruction was performed using a custom-designed 3D printed modular prosthesis (ultra-high molecular weight polyethylene and titanium alloy).
• The prosthesis was designed to match the contralateral talus and facilitate screw fixation for the subtalar joint.

Main Results:

• The patient achieved disease-free status post-surgery.
• Excellent functional outcomes were reported, including normal walking ability without aids, a Musculoskeletal Tumor Society score of 26/30, and an American Orthopedic Foot and Ankle Society score of 91/100.
• A preserved range of motion (40° dorsiflexion/plantar flexion) and no radiographic abnormalities were observed.

Conclusions:

• Total talar replacement with a 3D printed modular prosthesis is an effective surgical option for talus tumors.
• This technique successfully preserves ankle function and allows for near-normal limb function.