**Question:** Heberden's nodes are found in:

A. joints
B. bones
C. tendons
D. ligaments

**Core Concept:** Heberden's nodes are a type of joint disorder characterized by the formation of bony spurs on the palmar aspect of the proximal interphalangeal joints of the hands.

**Why the Correct Answer is Right:** Heberden's nodes are indeed found in the joints, specifically the proximal interphalangeal (PIP) joints of the hand. These nodes develop as a result of the degenerative changes in the joint due to aging or longstanding osteoarthritis. The presence of bony spurs (osteophytes) on the palmar aspect of the PIP joints is a clinical sign of Heberden's nodes.

**Why Each Wrong Option is Incorrect:**

A. Joints: Heberden's nodes are specific to the PIP joints of the hand, not other joints like knee or hip.
B. Bones: While bones may be affected in osteoarthritis, Heberden's nodes are specifically related to the joint structures, not the bones themselves.
C. Tendons: Tendons are connective tissues that connect muscles to bones, not the site of Heberden's nodes.
D. Ligaments: Ligaments are also connective tissues that connect bones, similar to tendons, but they are not related to Heberden's nodes.

**Clinical Pearl:** Heberden's nodes are an important clinical finding to recognize in patients with osteoarthritis, as it indicates the involvement of distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints. Recognizing this clinical sign can help differentiate between osteoarthritis and other joint disorders and aid in diagnosis and treatment planning.