Which one of the following bone not form articulating surface of knee joint.

Options

A. Femure
B. Patella
C. Tibia
D. Fibula

Answer

To determine which bone does not form an articulating surface of the knee joint, we need to analyze the bones associated with the knee joint.

### Step-by-Step Solution:

1. **Identify the Bones Involved in the Knee Joint**:
- The primary bones that form the knee joint are the femur, tibia, and patella.
- The femur (thigh bone) is the upper bone of the knee joint.
- The tibia (shin bone) is the main bone of the lower leg that supports weight and is directly involved in the knee joint.
- The patella (kneecap) is a small bone that sits in front of the knee joint and protects it.

2. **Analyze the Role of Each Bone**:
- **Femur**: Forms the upper articulating surface of the knee joint.
- **Tibia**: Forms the lower articulating surface of the knee joint.
- **Patella**: Provides protection and aids in the movement of the knee joint.

3. **Examine the Fibula**:
- The fibula is located alongside the tibia but is not directly involved in the knee joint articulation.
- It does not form any part of the knee joint surface and primarily serves for muscle attachment and stability of the ankle.

4. **Conclusion**:
- Among the bones mentioned, the fibula is the only one that does not form an articulating surface of the knee joint.

### Final Answer:
The bone that does not form an articulating surface of the knee joint is the **Fibula**.