Which one of the following is not a disorder of bone ?

Options

A. Arthritis
B. Osteoporosis
C. Rickets
D. Atherosclerosis

Explanation

To determine which of the following is not a disorder of bone, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a condition that is not related to bone disorders. We need to evaluate the options given.

2. **Evaluate Option A: Arthritis**:
- Arthritis is a condition characterized by inflammation of the joints, leading to pain and swelling. It is primarily associated with joint issues but can affect the bones indirectly. However, it is still considered a disorder related to the skeletal system.

3. **Evaluate Option B: Osteoporosis**:
- Osteoporosis is a bone disorder that involves the weakening of bones, making them more susceptible to fractures. It is directly related to bone health and is caused by factors such as vitamin D or calcium deficiency.

4. **Evaluate Option C: Rickets**:
- Rickets is a disease that affects bone development in children, leading to soft and weak bones due to vitamin D deficiency. It is also a bone disorder.

5. **Evaluate Option D: Atherosclerosis**:
- Atherosclerosis is a condition where there is a buildup of cholesterol and other substances in the walls of arteries, leading to reduced blood flow. This condition is related to the cardiovascular system and does not involve bones.

6. **Conclusion**: After evaluating all the options, it is clear that atherosclerosis is not a disorder of bone. Therefore, the answer is option D: atherosclerosis.

### Final Answer:
**Option D: Atherosclerosis**