Meniscal Dominant Loaders During Simulated Gait: A Cadaveric Study in Human Knees

Area of Science:

• Biomechanics
• Orthopedics
• Knee Joint Mechanics

Background:

• Joint contact force distribution changes post-injury, impacting tissue degeneration.
• Patient variability in knee mechanics is poorly understood, limiting clinical intervention success.
• Current patient-specific models are too labor-intensive for widespread use.

Purpose of the Study:

• To group human cadaveric knees based on tibial plateau joint contact force distribution during simulated gait.
• To test the hypothesis that knees can be categorized as 'meniscal-dominant' or 'cartilage-dominant' loaders.
• To investigate if peak contact stress location correlates with loading pattern.

Main Methods:

• Analyzed contact force data on tibial plateaus of 44 cadaveric knees during simulated gait.
• Used K-means clustering to group knees by medial/lateral plateau force distribution.
• Defined 'meniscal-dominant' and 'cartilage-dominant' loading based on load percentage and duration.

Main Results:

• Identified 4 clusters on the medial plateau, ranging from cartilage-dominant (7%) to meniscal-dominant (48%).
• Identified 3 clusters on the lateral plateau, ranging from cartilage-dominant (11%) to meniscal-dominant (72%).
• Peak contact stress shifted to the meniscus in meniscal-dominant loaders and cartilage in cartilage-dominant loaders on the medial plateau.

Conclusions:

• Human cadaveric knees can be stratified by load distribution through menisci.
• Peak pressures were higher in cartilage-dominant loading knees.
• This heterogeneity is fundamental to understanding knee injury and repair biomechanics.