Internal pressure of human meniscal root attachments during loading.

Area of Science:

• Orthopedic biomechanics
• Human anatomy
• Sports medicine

Background:

• Meniscal root attachments are crucial for knee joint stability.
• Understanding internal pressure within these attachments is vital for effective treatment strategies.
• Previous research has not fully elucidated the biomechanical forces acting on meniscal root attachments.

Purpose of the Study:

• To investigate the internal fluid pressure within human cadaver meniscal root attachments under simulated physiological loading.
• To determine the influence of knee flexion angle and anterior cruciate ligament (ACL) integrity on meniscal root attachment pressure.
• To provide data to inform surgical repair and rehabilitation protocols for meniscal root tears.

Main Methods:

• Human cadaver knee joints were utilized.
• A pressure micro-sensor was implanted into meniscal root attachment sites.
• Joints were subjected to 2x body weight compression at varying flexion angles.
• Pressure was recorded before and after ACL transection and lateral posterior horn incision.

Main Results:

• The medial posterior (MP) meniscal root attachment exhibited significantly higher ramp and equilibrium pressures compared to other sites.
• Knee flexion angle significantly affected pressure, with highest ramp pressure observed at full extension.
• Anterior cruciate ligament (ACL) transection altered pressures, decreasing ramp pressure in the lateral posterior (LP) attachment and increasing equilibrium pressure in the MP attachment.

Conclusions:

• The medial posterior meniscal root attachment is subjected to substantial pressures, necessitating robust repair strategies.
• Rehabilitation programs following meniscal root repair should account for peak pressures occurring at full knee extension.
• Biomechanical insights into meniscal root function can guide the development of improved surgical and therapeutic interventions.