Gallbladder clips can fall off or migrate after surgery, but it’s rare. Surgical clips are placed on the cystic duct and cystic artery during gallbladder removal to seal them shut, and in the vast majority of cases they stay exactly where the surgeon put them. Only about 100 cases of clip migration with biliary complications have been reported in medical literature, despite hundreds of thousands of gallbladder removals performed worldwide each year.
Why Clips Sometimes Move
The exact process that causes a clip to shift isn’t fully understood, but several factors work together. Inaccurate clip placement during surgery is one contributor, particularly if the clip lands too close to or partially inside the bile duct wall. Once a clip starts to embed itself in the duct wall, the migration tends to continue rather than stop on its own.
Inflammation plays a significant role. If the original surgery was done during an episode of acute gallbladder inflammation or pancreatitis, dense scar tissue and swelling can distort the normal anatomy, raising the risk of a clip ending up where it shouldn’t be. After surgery, localized infection, bile leaks, or ongoing inflammation around the surgical site can push the process along further.
The number of clips used also matters. Studies have found that using more than four clips is associated with a higher chance of migration. In reported cases, the median number of clips that had been placed was six. More clips mean more opportunities for one to shift, and more hardware crowding a small anatomical space.
How a Migrated Clip Causes Problems
A clip that migrates into the bile duct doesn’t just sit there harmlessly. It acts as a seed for stone formation. Bile flowing through the duct deposits material around the foreign object, gradually building up a stone the same way a grain of sand becomes a pearl. As the stone grows larger, the clip can eventually detach completely from the duct wall and sit freely inside the stone itself.
This process can take years. In one reported case, a patient developed symptoms eight years after gallbladder removal. The growing stone and embedded clip can partially or fully block bile flow, leading to backed-up bile in the liver and bile ducts. Symptoms at that point typically resemble what you’d expect from a bile duct stone: upper abdominal pain (often on the right side), yellowing of the skin or eyes, fever, and sometimes infection of the bile ducts. These symptoms can easily be mistaken for a new, unrelated problem if nobody considers that the original surgical clips might be involved.
Clip Materials and Holding Strength
Most gallbladder clips are made of titanium, though absorbable polymer clips exist as an alternative. Each type has trade-offs. Titanium clips are permanent and can sometimes interfere with CT scans, creating image artifacts that make follow-up imaging harder to interpret. They also carry a small risk of eroding into nearby structures over time.
Absorbable clips, made from materials like polyglycolic acid, actually grip tissue more firmly when first applied. In laboratory testing on excised cystic ducts, the force needed to pull off an absorbable clip was significantly greater than for a titanium clip in both directions. The catch is that absorbable clips lose strength as the body breaks them down, retaining only about 11% of their original holding power by day 21. By that point, the surgical site has typically healed enough that the clip’s job is done, but the window of weakening is a relevant consideration.
How Migrated Clips Are Found
Abdominal X-ray, CT scan, and MRI are considered the standard tests for detecting a clip that has moved. On imaging, a migrated titanium clip shows up as a small, bright metallic object, sometimes sitting inside a bile duct stone. Ultrasound can detect the consequences of migration, like dilated bile ducts, but often can’t visualize the distal (lower) portion of the common bile duct clearly enough to spot the clip itself.
Endoscopic ultrasound (EUS), where an ultrasound probe is passed through the mouth into the upper digestive tract, offers a closer look. It can show migrated clips as distinct parallel bright lines within a bile duct stone, making it possible to identify the clip as the cause of the blockage before any intervention. In one documented case, EUS revealed two migrated clips embedded inside a 14-by-5-millimeter stone in the common bile duct.
How Migrated Clips Are Removed
The standard treatment is a procedure called ERCP (endoscopic retrograde cholangiopancreatography), where a flexible scope is guided through the mouth, down through the stomach, and into the opening of the bile duct. Through this scope, the doctor can extract both the stone and the embedded clip without open surgery. During the procedure, a contrast dye outlines the bile duct on X-ray, clearly showing the stone and the clip shadows within it.
In most cases, the clip and stone are successfully removed in a single session, and the bile duct blockage resolves. Because this complication is so uncommon, there’s no routine follow-up protocol specifically designed to watch for clip migration after gallbladder surgery. If you develop symptoms like abdominal pain, jaundice, or fever months to years after gallbladder removal, mentioning your surgical history helps your doctor consider this possibility early rather than late.
MRI Safety With Surgical Clips
If you still have your clips in place (as the vast majority of people do, permanently and without issue), you may wonder whether they’re safe during an MRI. The concern with any metallic implant in a strong magnetic field is that a ferromagnetic object could torque or shift, potentially causing injury. Standard titanium surgical clips used in gallbladder surgery are generally considered MRI-compatible, but the specific clip type matters. If you’re scheduled for an MRI and aren’t sure what type of clips were used, your radiology team can check your surgical records before proceeding.