Biomechanics Following Isolated Posterolateral Corner Reconstruction Comparing a Fibular-Based Docking Technique With...

Area of Science:

• Orthopedic biomechanics
• Knee joint kinematics
• Surgical reconstruction techniques

Background:

• The posterolateral corner (PLC) is crucial for knee stability.
• Understanding the biomechanical performance of different PLC reconstruction methods is essential for optimizing surgical outcomes.
• Previous studies have evaluated static stability, but dynamic analysis under realistic loads is needed.

Purpose of the Study:

• To compare the biomechanical integrity of two distinct posterolateral corner (PLC) reconstruction techniques.
• To analyze knee joint kinematics under dynamic external loads using a robotic system.
• To evaluate the effectiveness of fibular-based docking versus anatomic PLC reconstruction.

Main Methods:

• Eight cadaveric human knee specimens were subjected to dynamic external and varus torques.
• Six degrees of freedom kinematics were measured in intact, PLC-deficient, and reconstructed states (fibular-based and anatomic).
• Tibial external rotation and varus rotation were assessed at 30°, 60°, and 90° of flexion.

Main Results:

• Both PLC reconstruction techniques provided adequate constraint across most flexion angles.
• The fibular-based technique resulted in underconstraint at 90° of flexion.
• The anatomic reconstruction led to overconstraint at 60° of flexion.

Conclusions:

• Both fibular-based and anatomic PLC reconstruction techniques offer biomechanical viability for isolated PLC injuries.
• Each technique presents specific limitations: fibular-based underconstraints at 90°, and anatomic overconstrains at 60°.
• Either technique can be considered for surgical treatment of high-grade isolated PLC injuries based on biomechanical performance.