**Core Concept**
Bony ankylosis is a condition characterized by the abnormal fusion of two or more bones, leading to a loss of joint mobility and a fixed position. This condition is often the result of a traumatic injury, infection, or inflammatory process.

**Why the Correct Answer is Right**
Bony ankylosis occurs when there is an abnormal formation of bone tissue, known as bone formation, within the joint space. This process is mediated by osteoblasts, which are specialized cells responsible for bone synthesis. The formation of new bone tissue leads to the fusion of the bones, resulting in a loss of joint mobility. In the case of bony ankylosis, the joint space is obliterated, and the bones become fused together.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the underlying pathophysiology of bony ankylosis. While inflammation can contribute to joint damage, it is not the primary cause of bony ankylosis.

**Option B:** This option is incorrect because it is a characteristic of fibrous ankylosis, not bony ankylosis. Fibrous ankylosis involves the formation of fibrous tissue within the joint space, rather than bone.

**Option C:** This option is incorrect because it is a characteristic of joint contracture, not bony ankylosis. Joint contracture involves a loss of joint mobility due to the shortening of muscles or tendons, rather than the fusion of bones.

**Clinical Pearl / High-Yield Fact**
It's essential to distinguish between bony ankylosis and fibrous ankylosis, as they have different underlying pathophysiologies and treatment options. Bony ankylosis often requires surgical intervention to restore joint mobility, whereas fibrous ankylosis may be treated with physical therapy and anti-inflammatory medications.

**Correct Answer:** D.