## **Core Concept**
Meniscectomy and meniscal repair are two surgical options for managing meniscal tears, each with specific indications. The decision between the two depends on factors such as tear location, size, stability, and patient-related factors. A thorough understanding of meniscal anatomy and tear characteristics is essential.

## **Why the Correct Answer is Right**
Degenerative tears, particularly those in the **avascular zone** of the meniscus (also known as the white zone), have a limited blood supply, which significantly impairs the healing process. In such cases, meniscal repair is often not feasible due to the poor vascularity, making **meniscectomy** a more suitable option. This is because the avascular zone lacks the necessary blood supply for healing, which is a critical factor for the success of meniscal repair.

## **Why Each Wrong Option is Incorrect**
* **Option A:** Tears in the **red zone** (peripheral one-third of the meniscus) generally have a good blood supply, making meniscal repair a viable and often preferred option due to its potential for healing.
* **Option B:** Longitudinal tears, especially if they are in a stable and vascular region, can often be repaired as they have a better chance of healing.
* **Option C:** Radial tears, depending on their location and size, might be challenging to repair but are not automatically an indication for meniscectomy over repair without considering other factors.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is the **vascular zones** of the meniscus: the red-red zone (peripheral), red-white zone (middle), and white-white zone (central). Tears in the avascular (white-white) zone are less likely to heal with repair. A simple way to approach meniscal tears is to consider the tear's location and stability when deciding between repair and meniscectomy.

## **Correct Answer: D. Degenerative**