Patient-Specific Restoration of Constitutional Alignment Within Predefined Safety Boundaries Using Three-Dimensional...

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Medical Technology

Background:

• Investigating a novel surgical concept for primary total knee arthroplasty (TKA).
• Focusing on restoring constitutional bony alignment within safety boundaries.
• Utilizing modern 3D navigation with standard knee implants.

Purpose of the Study:

• To evaluate the one-year clinical outcomes of TKA using 3D navigation for patient-specific alignment.
• To assess the technique's ability to recreate native joint mechanics.
• To determine patient satisfaction and functional improvements.

Main Methods:

• Retrospective analysis of 185 TKAs (171 patients).
• Application of patient-specific alignment restoration using a 3D navigation system.
• Clinical outcome assessment via KSS, FJS-12, UCLA Activity Scale, and Likert satisfaction scale.

Main Results:

• 87.6% of patients reported satisfaction or high satisfaction.
• Significant improvements observed in KSS, FJS-12, and UCLA Activity Scale scores (p < 0.001).
• High accuracy in bone cuts: 97.7% for FMA and 90.2% for TMA within ±1° of planned angles.

Conclusions:

• Patient-specific alignment restoration in TKA using 3D navigation is a promising strategy.
• The technique combines precision and reproducibility with standard implants.
• This approach leads to high patient satisfaction by respecting individual constitutional alignment.