PUTH Orthopedics: Robotic-Assisted 3D-Printed Cementless Revision TKA

[Diagnostic Dilemma]
🔬 A 73-year-old female presented with aseptic loosening six years post-left total knee arthroplasty.

Robotic-assisted primary joint replacement is now routine across over a hundred tertiary hospitals in China, with tens of thousands of cases completed.

However, in the global orthopedic community, achieving precise 3D spatial orientation in revision surgeries with severe bone defects and distorted anatomical landmarks remains a highly demanding deep-water zone.

[Surgical Nuances]
⚙️ Director Hua Tian’s team at Peking University Third Hospital (PUTH) tackled this challenge using a domestic surgical robotic system.

As shown in the attached pre-operative planning interface, the core technical breakthrough is the system's dual-mode registration capability with and without the prosthesis in situ.

This ensures absolute continuity of intraoperative spatial coordinates and sub-millimeter precision of the osteotomy planes.

[Clinical Pearls]
💡 For the reconstruction strategy, the team utilized a biological revision prosthesis integrating 3D-printed Co-Cr-Mo and titanium additive manufacturing technologies.

This design bypasses traditional bone cement, relying directly on a customized metaphyseal configuration for initial mechanical press-fit stability.

Simultaneously, the highly porous titanium surface drives long-term biological osteointegration.

[Take-home Message]
🎯 By quantifying lower limb alignment and dynamic soft tissue gap balancing through the robotic system, complex revisions have completely moved away from empirical reliance.

The patient achieved a smooth recovery and was discharged on postoperative day 5.