The TFCC, or Triangular FibroCartilage Complex, is a soft tissue cushion and wrist stabilizer on the ulnar side (pinky finger side) or the wrist. Most people are aware of the “meniscus” which cushions and stabilizes the knee – the TFCC is a very similar structure in the wrist. The TFCC stabilizes the two forearm bones together – the radius and ulna. It also provides a cushion between the ulna and the carpal bones. When the TFCC is torn or injured, patients experience pain along the pinky finger side of the wrist.
TFCC tears can be “traumatic”, from a fall or twisting injury of the wrist. They can also be “degenerative”, where the TFCC slowly wears out over time.
- Pain along ulnar (pinky finger) side of the wrist
- Discomfort with wrist motion – most commonly rotating the wrist/forearm and bending the wrist towards the pinky finger
- Wrist or hand weakness
- Clicking in the wrist with movements
TFCC tears can be diagnosed by talking with your doctor and having them examine your wrist. X-rays are sometimes obtained to rule out other injuries. Occasionally they will show the ulna bone being longer than the radius bone, which can pre-dispose a patient to injuries on the “ulnar side” of the wrist. An MRI is the best imaging tool for looking at soft tissue injuries such as TFCC tears, and will sometimes be obtained to aid in the diagnosis (see image below).
A TFCC tear can oftentimes heal itself if the wrist is immobilized with a splint or cast. It is important to completely eliminate wrist motion for at least 4 weeks to optimize healing success. Some areas of the TFCC have excellent blood supply and are amenable to healing. However, some areas with poor blood supply, and some large or chronic tears, may not heal even if properly immobilized.
Wrist arthroscopy is done through small incisions on the back of the wrist. A camera is inserted through a small cut on the back of the wrist with the image projected onto a television screen. This allows for excellent visualization of the inside of the wrist and assessment of injured structures. Another small cut can be used to insert instruments for minimally invasive repair and treatment of injuries. This can result in less soft tissue disruption and less pain and swelling, which can lead to a faster recovery.
Some TFCC tears may not be amenable to treatment with arthroscopy, and may require repair through an incision on the back of the wrist.