Os triangulare

Os Triangulare

The os triangulare is a small bone found in the wrist, specifically in the region of the carpal bones. It is considered an accessory bone, meaning it is not present in all individuals. The os triangulare is also known as the os triquetrum or triangular bone.

Anatomy

The os triangulare is located on the ulnar side of the wrist, adjacent to the pisiform bone. It is one of the eight carpal bones that make up the wrist, and it is the third most commonly found accessory bone in the wrist. The bone is roughly pyramid-shaped, hence its name, which is derived from the Latin word for "three-cornered."

Clinical Significance

The os triangulare is of clinical significance due to its potential to cause pain and discomfort in the wrist. This is often the result of trauma or repetitive strain, which can lead to conditions such as os triangulare syndrome or carpal instability. Diagnosis of these conditions often involves imaging techniques such as X-ray or MRI.

See Also

• Carpal bones
• Accessory bone
• Wrist pain