Tensile forces on repaired medial meniscal root tears

Area of Science:

• Orthopedic surgery
• Biomechanics
• Sports medicine

Background:

• Medial meniscal root tears often require surgical repair.
• Understanding forces on the repair is crucial for successful healing and rehabilitation.

Purpose of the Study:

• To quantify tensile forces on repaired posterior medial meniscal roots.
• To determine the influence of femorotibial rotation, flexion, and compressive load on these forces.

Main Methods:

• Repair of detached posterior medial meniscal roots using pullout sutures in 6 human cadaveric knees.
• Measurement of suture tension using a force transducer across various flexion angles (up to 120°).
• Testing under neutral, internal, and external rotation with compressive loads of 100 N and 500 N.

Main Results:

• Femorotibial rotation significantly impacted meniscal root tension (P < .001).
• Internal rotation increased tension, while external rotation decreased it.
• Compressive load also significantly affected tension (P < .001), with higher loads generating more force. A trend of increased tension with greater flexion was observed.

Conclusions:

• Knee motion and weight-bearing generate substantial tensile forces at the posterior medial meniscal root repair site.
• Internal rotation markedly increases tension, whereas external rotation decreases it.
• Findings can guide the selection of post-operative rehabilitation exercises to optimize meniscal repair outcomes.