In the context of joint movement, what does "convex" describe?

The term "convex" is used in anatomy and kinesiology to describe a surface that curves outward. This outward curvature is key when discussing joint movements because it affects how articulating surfaces interact with one another. When a convex structure moves over a concave one, such as during flexion or extension of a joint, it influences the direction of joint motion and stability.

In contrast, the other options describe different surface properties that do not align with the meaning of "convex." A flat or smooth surface would be described simply as such, not convex, while a surface that dips inward would be referred to as concave. Similarly, a rough or irregular edge describes a texture rather than a curvature. Understanding these distinctions is important in sports medicine and anatomy, as they relate to how joints function and respond to movements during physical activity.