Condyle

Definition

A rounded articular prominence at the end of a skeletal element that forms part of a joint, typically articulating with a corresponding concave socket (acetabulum or cotyle). In arthropods, condyles occur on leg segments (coxa, trochanter, femur, tibia, tarsus), antennae, mouthparts, and other appendages, serving as pivot points for flexion, extension, and rotation. They may be single (monocondylic) or paired (dicondylic), with the latter arrangement restricting movement to a single plane.

Etymology

Greek kondylos, 'knuckle' or 'prominence'

Example

The dicondylic mandible of a chewing insect articulates with the head capsule via anterior and posterior condyles, permitting dorsoventral movement while limiting rotation.

Related Terms

• acetabulum
• Articulation
• dicondylic
• monocondylic
• Trochanter
• Coxa
• genu
• tarsomere
• hinge joint
• ball-and-socket joint

Usage Notes

In arthropod anatomy, 'condyle' specifically denotes the convex component of an articulation; the matching concave surface is termed an acetabulum or cotyle. Dicondylic joints (two condyles) are common in insect legs and provide hinge-like motion, whereas monocondylic joints allow greater rotational freedom. The term is sometimes used loosely for any rounded articular process, but precise usage distinguishes true condyles from simpler condyloid or hinge structures.