Radial and longitudinal meniscus tears show different gapping patterns under stance phase conditions

Area of Science:

• Orthopedics
• Biomechanics
• Biomedical Engineering

Background:

• Meniscal tears can alter knee joint mechanics by increasing contact pressures between the tibia and femur.
• Understanding the biomechanical consequences of different meniscus tear types is crucial for effective treatment.

Purpose of the Study:

• To quantify the gapping behavior of radial and longitudinal meniscus tears.
• To assess the impact of these tears on peak contact pressure and mean contact area in the knee joint.

Main Methods:

• Utilized porcine knee joints with surgically created radial and longitudinal meniscal tears.
• Employed Roentgen stereophotogrammetric analysis (RSA) with tantalum markers to measure tear gapping.
• Quantified contact pressure and area under simulated physiological loading conditions (0-350 N).

Main Results:

• Longitudinal tears showed no significant gapping or change in contact pressure.
• Radial tears resulted in significant gapping and increased peak contact pressure compared to the native state.
• Inside-out suturing partially restored gapping in radial tears and normalized contact pressure.

Conclusions:

• Radial meniscus tears, unlike longitudinal tears, cause significant gapping and alter knee joint biomechanics.
• Tear type is a critical factor influencing meniscal function and joint contact mechanics.
• Surgical repair of radial tears can mitigate adverse biomechanical changes.