Meniscal repair. An experimental study in the goat

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Regenerative Medicine

Background:

• Meniscal tears are common knee injuries.
• The healing potential of meniscal tears is influenced by tear location and knee stability.
• Current clinical practices often involve surgical repair for peripheral meniscal tears.

Purpose of the Study:

• To evaluate the healing potential of longitudinal medial meniscal tears in goats.
• To determine the influence of tear location and anterior cruciate ligament (ACL) status on meniscal healing after repair.
• To assess the accuracy of arthrography in predicting meniscal repair outcomes.

Main Methods:

• A longitudinal medial meniscal tear model was created in 48 goat knees.
• Tears were surgically repaired in one knee and left unrepaired in the contralateral knee of each goat.
• Goats were grouped based on tear location (peripheral 20-25% or 40-50%) and ACL status (intact or incised).
• Outcomes were assessed at 6 months via arthrography and direct examination.

Main Results:

• In knees with an intact ACL, peripheral 20-25% tears healed in 6/7 repaired menisci versus 1/7 unrepaired menisci.
• Peripheral 40-50% tears showed limited healing (1/8 repaired, 0/8 unrepaired) regardless of ACL status.
• ACL incision significantly reduced healing rates in peripheral 20-25% tears (1/8 repaired, 0/8 unrepaired).
• Arthrography demonstrated 92% accuracy in predicting meniscal repair status.

Conclusions:

• Meniscal repair is effective for peripheral 20-25% tears when the ACL is intact.
• Tear location and knee stability are critical factors for successful meniscal healing.
• Surgical intervention supports natural healing mechanisms for specific meniscal tear types.