[TKA revision of semiconstraint components using the 3-step technique]

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Reconstructive Surgery

Context:

• Revision total knee arthroplasty (TKA) is complex, often necessitated by bone loss, infection, or instability.
• Restoring the native joint line is crucial for optimal function and longevity of TKA.
• Existing techniques may face challenges in achieving reproducible joint line restoration.

Purpose:

• To describe and evaluate a three-step surgical technique for revision total knee arthroplasty.
• To achieve a pain-free and stable knee joint through reproducible restoration of the joint line.
• To assess the clinical and radiological outcomes of this revision TKA technique.

Summary:

• A prospective study of 168 revision TKAs utilized a three-step technique focusing on tibia component positioning, flexion gap balancing, and extension balancing.
• The technique demonstrated high success rates, with 86.3% accurate joint line reconstruction and 92.7% of knees showing malposition <3°.
• Postoperative American Knee Society scores improved significantly from 47.6 to 81.5, with 89% of patellae exhibiting correct tracking.

Impact:

• This technique offers a reproducible method for achieving optimal joint line restoration in revision TKA.
• Improved clinical outcomes and component alignment suggest potential for enhanced long-term implant survival.
• The findings provide valuable insights for orthopedic surgeons performing complex knee revision procedures.