Quadrate ligament

The Quadrate ligament is a ligament in the human body that connects the neck of the radius to the inferior border of the radial notch of the ulna. It is part of the elbow joint and helps to stabilize the proximal radioulnar joint.

Etymology

The term "quadrate" is derived from the Latin word "quadratus" which means "square". This is likely due to the ligament's roughly square shape.

Structure

The quadrate ligament is a small, quadrilateral band that measures about 1 cm in length. It is located on the medial side of the elbow and is oriented horizontally. The ligament is attached by its base to the lower margin of the radial notch of the ulna, and by its apex to the neck of the radius.

Function

The quadrate ligament plays a crucial role in the stability of the proximal radioulnar joint. It helps to maintain the articulation of the head of the radius with the radial notch of the ulna. This is important for allowing rotation of the forearm, such as when turning a doorknob or screwdriver.

Clinical significance

Injury to the quadrate ligament can result in instability of the proximal radioulnar joint. This can lead to pain, limited range of motion, and potentially long-term disability if not properly treated. Diagnosis is typically made through physical examination and imaging studies, such as MRI or ultrasound.

See also

• Ligament
• Elbow
• Radius (bone)
• Ulna

References

• 
  Gray's Anatomy illustration of the elbow joint