A global verification study of a quasi-static knee model with multi-bundle ligaments

Area of Science:

• Biomechanics
• Orthopedic Surgery
• Knee Joint Anatomy

Background:

• Knee ligaments were traditionally viewed as uniform structures.
• Previous research proposed a novel multi-bundle ligament concept with varied properties.
• This study aimed to validate the multi-bundle ligament concept.

Purpose of the Study:

• To verify the multi-bundle concept of knee ligaments.
• To compare experimental laxity measurements with model predictions.
• To assess the functional role of the multi-bundle model in knee joint loading.

Main Methods:

• A human knee specimen was used for experimental laxity measurements (varus-valgus and anterior-posterior).
• A 3D quasi-static knee model was developed using specimen-derived geometric and mechanical parameters.
• Model simulations were performed to predict laxity characteristics.

Main Results:

• The model accurately predicted anterior-posterior (AP) translation and varus-valgus (VV) rotation laxity patterns during knee flexion.
• Model predictions closely matched experimental results for most loading conditions.
• Slight discrepancies were observed under specific high-load varus moments and posterior tibial loading.

Conclusions:

• The multi-bundle representation of knee ligaments with non-uniform properties is validated by this study.
• The proposed model effectively simulates anterior-posterior and varus-valgus laxity characteristics of the human knee.
• This validated model provides a robust tool for studying knee joint biomechanics and injury mechanisms.