Which portion of the meniscus has the highest chance of healing after a tear?

The outer 1/3rd of the meniscus has the highest chance of healing after a tear due to its proximity to the blood supply. The meniscus, particularly in the knee, is comprised of different regions that vary in vascularity. The outer portion, or the peripheral zone, receives blood supply from the surrounding vasculature, which is crucial for healing since adequate blood flow allows for the necessary nutrients and cells involved in the healing process to reach the injured site.

In contrast, the inner 1/3rd of the meniscus, often referred to as the avascular zone, is more poorly supplied with blood, making it significantly less likely to heal on its own after injury. The central 1/3rd typically has a similar lack of blood supply when compared to the inner section, and thus also has limited healing capabilities. The notion of a "medial segment" does not inherently refer to a specific part of the meniscus in terms of vascularity, making it less relevant in the context of healing potential.

Understanding the role of blood supply in the healing process highlights why the outer 1/3rd is the most favorable region for recovery after a meniscal tear.