What movements occur at the distal radioulnar joint?

What movements occur at the distal radioulnar joint?

Movements. —The movements in the distal radioulnar articulation consist of rotation of the lower end of the radius around an axis which passes through the center of the head of the ulna. When the radius rotates forward, pronation of the forearm and hand is the result; and when backward, supination.

What does the distal radius do?

The distal radius is the end (distal) portion of the forearm bone (radius). It connects to the carpal bones at the wrist and runs parallel to the ulna, which is the other bone of the forearm. The radius transmits up to 80% of the forces across the wrist to the forearm.

What type of joint movement does the radius do?

The radius articulates with the ulna in a synovial pivot joint. The radial head rotates within the annular ligament and radial notch on the ulna to produce pronation of the forearm. The radius and ulna also articulate distally in reverse to their articulation at the elbow to produce supination.

What is the process on the distal end of the radius?

Radius. The distal end of the radius has a smooth surface for articulation with two carpal bones to form the radiocarpal joint or wrist joint (Figure 6.43). The lateral end of the radius has a pointed projection called the styloid process of the radius.

What movements occur at the wrist joint?

The wrist joint also referred to as the radiocarpal joint is a condyloid synovial joint of the distal upper limb that connects and serves as a transition point between the forearm and hand. A condyloid joint is a modified ball and socket joint that allows for flexion, extension, abduction, and adduction movements.

What is distal articulation?

35290. Anatomical terminology. The distal radioulnar articulation (inferior radioulnar joint) is a synovial pivot-type joint between the two bones in the forearm; the radius and ulna. It is one of two joints between the radius and ulna, the other being the proximal radioulnar articulation.

What happens after wrist plate surgery?

The metal plate and screws allow people to start using the wrist earlier. Motion and light use of the wrist are started ~2 weeks after surgery. Once the bone has healed (~6 weeks), more vigorous activities are allowed. The metal plate and screws are made of titanium, they are usually left in place forever.

What attaches to the styloid process of the ulna?

The rounded end of the styloid process of the ulna connects to the ulnar collateral ligament of the wrist. The radioulnar ligaments also attaches to the base of the styloid process of the ulna.

When the distal end of a limb makes a circular movement?

Circumduction. Circumduction is the movement of a body region in a circular manner, in which one end of the body region being moved stays relatively stationary while the other end describes a circle.

How does the radius bone move?

The radius permits the forearm and hand to pronate and supinate, flex and extend at the elbow, and adduct, abduct, extend, flex, and circumduct the wrist. Pronation and supination occur through complex articulation with the cylindrical shaped radial head, which is stabilized to the ulnar notch by the annular ligament.

What is the movement of wrist?

Is the distal end of the distal radioulnar joint static?

The distal radioulnar joint is a uniaxial joint that has one degree of freedom; During these movements, the distal end of radius rotates around the head of ulna. The axis for rotation is not static and changes depending on the forearm position.

What causes a fracture of the distal radius?

Colles fracture: is a fracture of the distal radius. Commonly caused by a fall on outstretched hand (FOOSH) Radial head fracture: commonly caused from FOOSH this can be accompanied by dislocation of the radius and/or ulna which can complicate the management of this injury.

How does a Smith Fracture of the distal radius work?

A Smith fracture of the distal radius. Shear: This refers to the action of the bone and its movement as the result of the fracture. As the fracture occurs, the bone shears – one end of the bone moves in one direction while the other moves in the opposite direction, similar to a highway being sheared by an earthquake.

What are the bones that move at the radioulnar joint?

Flexion ( or palmar flexion) at the radioulnar joint is described as the movement in which the palmar aspect of the hand moves towards the forearm in the sagittal plane. During flexion, the scaphoid and lunate bones glide over the concave articular surface of the distal radius in a posterosuperior direction.