Pathological anatomy of the aging meniscus

Area of Science:

• Orthopedic Surgery
• Gerontology
• Anatomical Pathology

Background:

• Knee joint degeneration is a prevalent condition, especially in aging populations.
• Meniscal tears and articular surface damage are common findings in knee osteoarthritis.
• The relationship between meniscal degeneration and articular changes requires further investigation.

Purpose of the Study:

• To investigate the incidence of horizontal meniscus tears in autopsy subjects and anatomical cadavers.
• To assess associated degenerative changes in the knee's articular surfaces.
• To establish a correlation between meniscal tears and articular surface degeneration.

Main Methods:

• Extensive dissection of knee joints from 21 autopsy subjects and 25 anatomical cadavers.
• Systematic evaluation for degenerative changes in menisci, focusing on horizontal tears.
• Grading of articular surface damage (none, minimal, moderate, severe).

Main Results:

• Thirty-nine horizontal meniscus tears were identified in 21 subjects, with 32 in the medial meniscus.
• Articular damage was observed in 18 subjects, ranging from minimal to severe.
• The highest incidence of tears occurred in the seventh and eighth decades, with a slight male predominance.

Conclusions:

• Degenerative horizontal meniscus tears are integral to the overall degenerative process of the knee joint.
• These meniscal tears often coexist with articular surface degeneration.
• Treatment strategies should consider the meniscal tear as part of a comprehensive knee joint degenerative condition.