TFCC tear

What it means

The triangular fibrocartilage complex, usually shortened to TFCC, is a small but hardworking cluster of cartilage and ligaments tucked between the end of the forearm's smaller bone (the ulna) and the wrist bones on the pinky-finger side of the wrist. It acts as a shock absorber, cushioning load as it passes through the wrist, and it also helps stabilize the joint where the two forearm bones meet, letting you rotate your palm up and down. A TFCC tear is damage to that cartilage or to the ligaments that make it up.

Why it appears on a CT or MRI report

MRI, sometimes with contrast dye injected into the joint (MR arthrogram), is the usual way to visualize the TFCC clearly, since it's a small, thin structure that's hard to see well on x-ray. Reports describe whether the tear is traumatic (from an injury) or degenerative (from wear over time), where within the complex the tear is located, and whether there's associated instability between the forearm bones or wear on nearby cartilage. The report may also note the length of the ulna relative to the radius, since a relatively long ulna can put extra stress on the TFCC over time.

What it usually means

TFCC tears generally fall into two groups. Traumatic tears happen from a specific event — a fall onto an outstretched hand, a forceful twist of the wrist, or a heavy pulling injury — and tend to cause pain right away on the pinky side of the wrist, often with clicking or a feeling of weakness when gripping or rotating. Degenerative tears build up gradually with age and repetitive load, particularly in people whose ulna is a bit longer relative to the radius, and may cause milder, more gradually worsening symptoms or sometimes none at all. Many TFCC tears, especially smaller or degenerative ones, improve with rest, splinting, and physical therapy aimed at wrist stability. Larger tears, tears causing genuine instability between the forearm bones, or those that don't settle with conservative care are sometimes treated with arthroscopic surgery to repair or trim the damaged tissue.

When to follow up

Talk to a doctor if you have persistent pain on the pinky side of the wrist, especially with twisting motions like turning a doorknob or a wrench, a clicking or clunking sensation, or grip weakness that isn't improving with rest. A hand or wrist specialist can examine for instability and decide whether imaging or a period of splinting and therapy makes sense. Seek prompt care for a wrist injury with significant swelling, an obvious deformity, or an inability to bear weight or use the hand normally.

A plain-language way to picture it

Think of the TFCC as a small wedge of gasket material stuffed into the gap between two pipes where they meet at an angle, cushioning them as they shift against each other and keeping them sealed together. A sudden hard twist can crack or split that gasket outright, while years of the pipes rubbing slightly out of alignment can slowly wear a thin spot into it. Either way, the wedge stops cushioning as well as it should, which is what shows up as pain and clicking when you twist or grip with that wrist.