The cartilage near the knee bones is non regenerative due to  

Options

A. absence of perimysium
B. absence of periosteum
C. absence of perichondrium
D. absence of chondroblasts

Answer

To answer the question "The cartilage near the knee bones is non-regenerative due to," we will analyze the options provided and understand the role of the pericondrium in cartilage health and regeneration.

### Step-by-Step Solution:

1. **Understanding Cartilage**:
- Cartilage is a type of connective tissue that is avascular, meaning it lacks blood vessels. This characteristic limits its ability to regenerate effectively.

2. **Role of Pericondrium**:
- The pericondrium is a dense layer of connective tissue that surrounds cartilage. It plays a crucial role in providing nutrients and oxygen to the cartilage cells (chondrocytes) since cartilage itself does not have a direct blood supply.

3. **Analyzing the Options**:
- **Absence of Perimysium**: Perimysium is a connective tissue that surrounds muscle fibers, not cartilage. This option is irrelevant.
- **Absence of Periosteum**: The periosteum is a connective tissue that covers the outer surface of bones, not cartilage. This option is also irrelevant.
- **Absence of Pericondrium**: This is the correct option. Without the pericondrium, the cartilage near the knee does not receive adequate nutrition and oxygen, making it non-regenerative.
- **Absence of Chondroblast**: Chondroblasts are cells that produce cartilage. While they are important for cartilage formation, their absence does not directly relate to the regenerative capacity of existing cartilage.

4. **Conclusion**:
- The correct answer is the **absence of pericondrium**, which leads to the non-regenerative nature of the cartilage near the knee bones due to insufficient nutrient and oxygen supply.

### Final Answer:
The cartilage near the knee bones is non-regenerative due to the **absence of pericondrium**.