**Core Concept**
Synovial chondromatosis is a rare joint disorder characterized by the formation of multiple nodules of hyaline cartilage within the synovial membrane of joints, leading to joint inflammation and degenerative changes. This condition is often associated with the production of abnormal cartilage fragments, which can cause mechanical symptoms and pain.

**Why the Correct Answer is Right**
The correct answer involves the understanding of synovial chondromatosis as a condition where abnormal cartilage formation occurs within the synovial membrane. The synovial membrane is a thin, fibrous structure that produces synovial fluid, which lubricates the joints. In synovial chondromatosis, the synovial membrane undergoes metaplasia, resulting in the formation of cartilage nodules. This process is thought to be triggered by chronic inflammation and mechanical stress within the joint.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because synovial chondromatosis primarily affects the synovial membrane, not the bone or ligaments.
* **Option B:** This option is incorrect because osteochondritis dissecans is a separate condition characterized by the loosening of a piece of cartilage and bone from the joint surface.
* **Option C:** This option is incorrect because degenerative joint disease (osteoarthritis) is a condition characterized by the wear and tear of joint cartilage and underlying bone, but it does not involve the formation of abnormal cartilage nodules within the synovial membrane.

**Clinical Pearl / High-Yield Fact**
Synovial chondromatosis often presents with mechanical symptoms such as locking or catching of the joint, which can be relieved by removing the abnormal cartilage fragments. This condition is typically seen in middle-aged individuals and can affect multiple joints.

**Correct Answer: B. Knee joint.**