Correlation between type of discoid lateral menisci and tear pattern

Area of Science:

• Orthopedic Surgery
• Knee Meniscus Pathology

Background:

• Discoid lateral meniscus is a congenital anomaly.
• Tear patterns in discoid lateral menisci require specific classification.
• Understanding tear patterns aids surgical decision-making.

Purpose of the Study:

• To analyze the relationship between discoid lateral meniscus types and tear patterns.
• To correlate tear patterns with the extent of meniscal resection during arthroscopy.

Main Methods:

• Retrospective analysis of 108 arthroscopic cases of discoid lateral meniscus tears.
• Classification of discoid menisci using Watanabe's system (complete vs. incomplete).
• Categorization of tear patterns (simple horizontal, complicated horizontal, longitudinal, radial, degenerative, complex).

Main Results:

• A statistically significant relationship exists between discoid meniscus type and tear pattern.
• Simple horizontal tears occurred exclusively in complete discoid menisci.
• Radial, degenerative, and complex tears were only observed in incomplete discoid menisci.
• Longitudinal tears showed no correlation with meniscus type.
• Meniscal resection extent varied by tear pattern; subtotal/total meniscectomy for longitudinal and complex tears, partial for radial and degenerative tears.

Conclusions:

• Discoid meniscus type influences tear patterns, impacting surgical strategy.
• Classification of tear patterns and meniscus type is crucial for planning arthroscopic resection.
• Findings can guide surgeons in determining the appropriate extent of meniscectomy.