What Is A TFCC Tear Of The Wrist?

Anatomy And Function Of The TFCC

The triangular fibrocartilage complex, commonly referred to as the TFCC, is as its name suggests, a complex structure made up of several interconnected parts. Located on the little finger (ulnar) side of the wrist, the TFCC includes a combination of ligaments, cartilage-like structures, and a tendon sheath. These components work together to support and stabilize the wrist joint.

More specifically, the TFCC lies between the radius and ulna, the two long bones of the forearm. It separates the radiocarpal joint (where the forearm meets the wrist) from the distal radioulnar joint (where the radius and ulna meet at the wrist). This location allows the TFCC to serve two main purposes: stabilization and cushioning. It helps stabilize the distal radioulnar joint, which is essential during rotational movements of the forearm like turning a key or twisting a doorknob. It also cushions the carpal bones on the ulnar side of the wrist, enhancing ulnocarpal stability during load-bearing tasks.

The TFCC is especially critical during gripping motions or any activity that involves weight-bearing through the hand. According to the American Society for Surgery of the Hand, TFCC injuries are a common cause of ulnar-sided wrist pain, particularly in athletes and manual laborers who regularly stress the wrist joint.

Triangular Fibrocartilage Complex Tears

A tear of the triangular fibrocartilage complex can lead to persistent and often debilitating wrist pain. There are two main categories of TFCC tears, classified based on the cause of injury:

• Traumatic Tears (Type 1): These tears often result from a sudden injury such as a fall onto an outstretched hand or forceful twisting motion. Sports that involve repetitive wrist rotation—like tennis, gymnastics, or baseball—can also lead to traumatic TFCC tears.
• Degenerative Tears (Type 2): These tears develop slowly over time due to wear and tear. The risk increases with age and is more common in individuals with pre-existing conditions such as ulnar variance, where the ulna is longer than the radius.

Both types of tears can compromise wrist function and affect daily activities. Early diagnosis and intervention are important to prevent further degeneration or joint instability.

Symptoms Of TFCC Tears

The most common symptom of a TFCC tear is pain on the ulnar side of the wrist, near the base of the little finger. However, pain may sometimes radiate across the entire wrist. Typically, this discomfort worsens with side-to-side wrist movement or during rotational tasks like turning a doorknob or screwdriver.

Applying pressure to the wrist—such as when pushing off a chair or performing push-ups—can also intensify the pain. These symptoms can interfere significantly with daily tasks and fitness routines.

Other triangular fibrocartilage complex tear symptoms may include:

• A clicking or popping sound during certain wrist movements, often accompanied by pain or instability.
• Tenderness to touch and localized swelling, particularly on the little finger side of the wrist.
• Noticeable weakness in the wrist, especially when gripping objects. This may become apparent during household chores, workplace duties, or lifting exercises at the gym.

Left untreated, TFCC tears can lead to chronic pain, reduced range of motion, and long-term instability in the wrist. A physiotherapist or orthopedic specialist can conduct specific tests such as the ulnar fovea sign or MRI imaging to confirm the diagnosis.

What Is the Ulnar Fovea Sign?

The ulnar fovea sign is a clinical test used to help diagnose injuries to the triangular fibrocartilage complex (TFCC) in the wrist. It involves pressing on a specific area called the ulnar fovea, which is a small depression located between the ulnar styloid and the flexor carpi ulnaris (FCU) tendon on the little finger side of the wrist.

How it works:

• The examiner applies gentle pressure to the ulnar fovea.
• If this causes localized pain or tenderness, it suggests a possible TFCC tear or injury.

This test is valuable because the TFCC attaches near this area, so pain here often indicates damage to the TFCC structures. The ulnar fovea sign is typically used alongside other clinical exams and imaging tests like MRI for a more accurate diagnosis.

Disclaimer: Sydney Physio Clinic does not endorse any treatments, procedures, or products mentioned. This information is provided as an educational service and is not intended to serve as medical advice. Anyone seeking specific orthopaedic advice or assistance on what is a TFCC tear of the wrist should consult a general practitioner, sports medicine specialist, orthopaedic surgeon, or physiotherapist.