Which joint allows movement in all planes?

The shoulder joint, also known as the glenohumeral joint, is a ball-and-socket joint that permits movement in multiple planes. This anatomical structure allows for a wide range of motion, enabling actions such as flexion, extension, abduction, adduction, and rotation. The spherical head of the humerus fits into the shallow socket of the scapula, providing the extensive mobility characteristic of this joint.

This ability to move freely in all directions is essential for various daily activities, sports, and other functional movements. The shoulder joint's design allows it to perform complex motions that are crucial for tasks that involve reaching, lifting, and throwing.

In contrast, other joints like the knee and ankle are more limited in their range of motion. The knee joint primarily allows flexion and extension, while the ankle permits dorsiflexion and plantarflexion, with limited movement in other planes. The hip joint, while also a ball-and-socket joint, has certain restrictions on movement due to the surrounding ligaments and muscles, making it less versatile compared to the shoulder joint.