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Achieving Specified Laxity in a Noncruciate Total Knee: A Laboratory Design Study
Peter S Walker1, Daniel Hennessy1, John Perez1
1New York University Langone Orthopedic Hospital, New York, New York.
The Journal of Arthroplasty
|March 17, 2024
Summary
This study aimed to replicate natural knee movement in total knee arthroplasty by optimizing tibial radii. Achieving ideal medial-anterior tibial conformity and a steeper distal-anterior femoral radius improved outcomes.
Area of Science:
- Biomechanical engineering
- Orthopedic surgery
- Biomedical imaging
Background:
- Noncruciate total knee arthroplasty (TKA) designs are increasingly utilized.
- Optimal bearing surface design and laxity parameters remain debated.
- This study proposes replicating native knee laxity as a design criterion.
Purpose of the Study:
- To determine ideal tibial radii for total knee arthroplasty (TKA) components.
- To achieve the laxity of the anatomic knee under load.
- To guide the design of TKA bearing surfaces.
Main Methods:
- Modeled femoral components based on 100 knee scans.
- Designed 8 tibial components with varying sagittal radii.
- Utilized a custom test rig to apply shear and torque, measuring femoral component motion.
Main Results:
- Femoral displacements varied from 0-11 mm; rotations ranged from 1-11°.
- Higher anterior than posterior femoral displacement observed due to femoral profile.
- Optimized components demonstrated close matching to anatomic laxity values.
Conclusions:
- A steeper distal-anterior femoral radius is advantageous.
- High medial-anterior tibial conformity is crucial for TKA performance.
- Lateral posterior tibial radius requires shallower design for femoral rollback, impacting lateral laxity.
