Feature of osteoahritis is
**Core Concept**
Osteoarthritis (OA) is a degenerative joint disease characterized by progressive wear and tear of articular cartilage, leading to bone-on-bone contact and subsequent joint pain and stiffness. This condition is often associated with aging, obesity, and repetitive joint stress.
**Why the Correct Answer is Right**
The correct answer choice is related to the pathophysiological changes observed in OA. The hallmark of OA is the loss of articular cartilage, which exposes the underlying subchondral bone. This leads to the formation of osteophytes (bone spurs) and the thickening of the joint capsule, resulting in joint stiffness and limited mobility. The subchondral bone undergoes sclerosis, a process of increased bone density, which further contributes to joint pain and stiffness.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because, while inflammation is present in OA, it is not a primary feature of the disease.
* **Option B:** This option is incorrect because, although OA is associated with joint pain, it is not the primary characteristic of the condition.
* **Option C:** This option is incorrect because, while joint stiffness is a feature of OA, it is not the most distinctive characteristic of the disease.
**Clinical Pearl / High-Yield Fact**
OA is a leading cause of disability worldwide, affecting over 30% of adults aged 65 and older. Early recognition and treatment of OA can help slow disease progression and improve quality of life.
**Correct Answer: C. Joint stiffness is a feature of osteoarthritis.**