What Is TAR Surgery? A Guide to Total Ankle Replacement
When ankle arthritis gets worse, simple things like standing for a long time or climbing stairs can become harder. If braces, physical therapy, injections, or other treatments stop helping enough, surgery might be considered. One option is total ankle replacement, also known as TAR surgery or total ankle arthroplasty.
Total ankle replacement is different from ankle fusion because it aims to reduce pain while allowing some movement in the ankle. However, it's not always the best choice for every person with ankle arthritis. Factors like bone quality, alignment, circulation, nerve health, past injuries, and activity level are all important.
What Does Total Ankle Replacement Actually Replace?
The main ankle joint, known as the tibiotalar joint, is where the bottom of the tibia meets the talus at the top of the foot. Normally, both surfaces are covered with cartilage, which lets the ankle move smoothly. In advanced or late-stage arthritis, this cartilage can wear down. As the joint gets more damaged, people may have pain, stiffness, swelling, or trouble walking.
In ankle replacement surgery, the damaged parts of the tibia and talus are replaced with metal and plastic parts that attach to the bone. These implants form an artificial joint that lets the foot move up and down.
The word “total” might make it seem like the whole ankle is removed, but that's not the case. The surgery only replaces the worn surfaces of the main ankle joint. It doesn't replace every joint in the foot, so pain from arthritis in other joints can still be present.
Why Does Ankle Arthritis Sometimes Lead to Surgery?
There are several reasons why ankle arthritis can develop. Some people get osteoarthritis as they age, while others have inflammatory arthritis like rheumatoid arthritis. Many cases are linked to old injuries. A fracture, bad sprain, or other trauma can damage cartilage or change the alignment, causing post-traumatic arthritis years later.
Nonsurgical treatments can help control ankle pain for a long time. Depending on the person, treatment might include changing activities, using braces or orthotics, taking medication, doing physical therapy, or getting injections.
Surgery is usually considered when severe arthritis keeps limiting walking and daily activities, even after trying other treatments. The main goal is to reduce pain and improve function in the arthritic ankle joint.
How Is Total Ankle Replacement Different From Ankle Fusion?
Ankle replacement and ankle fusion, also called ankle arthrodesis, are two ways to treat advanced ankle arthritis. In total ankle replacement, the damaged joint surfaces are replaced with an implant that lets the ankle keep some movement. In ankle fusion, the tibia and talus are joined together so the painful joint does not move anymore.
Having some movement in the ankle can help you walk more naturally and put less stress on nearby joints. Fusion creates a stable base and may be a better choice if there is poor bone quality, infection, severe instability, or deformity that makes an implant hard to support.
Neither procedure is always the right answer. The best choice depends on the specific condition of the ankle.
When Is TAR Usually Considered?
Just having arthritis doesn't mean total ankle replacement is the right option. A surgeon considers where the pain comes from, how much damage there is, and also checks the rest of the foot and ankle. Things like bone quality, alignment, circulation, nerve health, activity goals, overall health, and the condition of nearby joints all play a role in the decision.
Someone who is generally healthy, has severe ankle arthritis, and little or no deformity is usually a better candidate for this surgery. Conditions like diabetes, poor circulation, skin sores, and other health issues can increase the risk of infection or wound problems. High-impact activities can also cause more wear on an ankle replacement over time.
What If You’ve Had a Previous Ankle Injury or Surgery?
Having a previous injury or ankle surgery doesn't mean you can't have TAR surgery. Some people need ankle replacement because they developed arthritis after an old fracture or serious sprain.
Things like plates, screws, scar tissue, old incisions, bone loss, and changes in alignment can affect how the surgery is planned. Weight-bearing X-rays and CT scans help show how the bones have healed and if there is enough support for an implant.
A significant deformity does not always rule out ankle replacement. If the ankle tilts or the foot doesn't rest evenly, too much force can be placed on one side of the implant, which may cause wear, loosening, or instability. Sometimes, bone realignment, ligament repair, tendon balancing, or treating another joint can help improve alignment.
These procedures can be done at the same time as TAR surgery or in a separate surgery beforehand. If the foot and ankle cannot be aligned well enough to protect the implant, ankle fusion might be a safer choice.
What Happens During TAR Surgery?
During surgery, the damaged cartilage and joint surfaces are removed from the tibia and talus. The surgeon then prepares the bone and places the metal and plastic parts that make up the new surfaces of the ankle. The ankle needs a stable base for the replacement to work well. If there's a tight Achilles tendon, a very flat foot, a deformity in another joint, or another source of pain, extra surgery may be needed before or during the replacement. That's why two people having total ankle replacement may have different surgeries or recovery plans.
What Is Ankle Replacement Recovery Like?
Recovery after ankle replacement happens gradually. In the early stage of recovery, the surgical area needs time to heal, and the new joint must be protected. Most patients can't stand or walk on the operated ankle for about six to eight weeks, or until the surgeon says it is safe. Physical therapy is started based on each person’s recovery plan.
During this time when you can't put weight on your ankle, you may need to use crutches or other mobility aids. As you heal, your surgeon will let you know when it is safe to put more weight on your ankle, move more, and eventually get back to regular activities and wearing normal shoes. There is no one-size-fits-all recovery schedule for ankle replacement. Extra procedures, how the wound heals, and the ankle’s condition before surgery can all affect how long recovery takes.
What Kind of Motion Can You Expect After Ankle Replacement?
The goal of total ankle replacement is to keep useful movement in the ankle, not to make it perfectly normal. Having some ankle movement can make walking feel more natural than with a fused joint. However, how much motion you have after surgery depends on how stiff your ankle was before and if other joints or soft tissues are affected.
TAR surgery is not meant to make everyone completely pain-free or allow unlimited high-impact activities. The main goal is usually to reduce pain and improve daily function while protecting the implant from too much wear.
What Are the Risks of Total Ankle Replacement?
Like other major foot and ankle surgeries, TAR surgery can have complications. These may include infection, problems with wound healing, nerve or blood vessel injury, blood clots, fractures, ongoing pain, instability, or issues with the implant over time. Risks are different for each person. That's why doctors look at bone quality, circulation, alignment, nerve health, past surgeries, and overall health before doing the procedure.
How Long Does an Ankle Replacement Last?
Ankle replacement implants can wear out, become loose, or fail as time goes on. Studies have found as many as 90% of total ankle replacements are still in good condition five years after surgery. Some patients may need another operation roughly 10 to 15 years after the first procedure.
These numbers are not a guarantee for any one person. How long an implant lasts depends on things like the ankle’s condition before surgery, alignment, bone support, activity level, and wear over time.
What Is Revision Total Ankle Replacement?
Revision total ankle replacement is another surgery done when an ankle implant becomes painful or fails. An implant can become painful due to wear, loosening, bone loss, poor alignment, instability, infection, fracture, or problems in nearby soft tissues or joints.
Depending on the reason, revision surgery might mean replacing one or more parts of the implant, rebuilding lost bone, correcting deformity, or fixing another problem in the foot and ankle. Sometimes, another replacement is not possible. If there's a lot of bone loss, infection, severe instability, poor circulation, or a deformity that cannot be fixed, fusion may be a more stable choice.
What TAR Can and Can’t Do
Total ankle replacement can help reduce pain from an arthritic ankle joint while keeping some movement. For the right patient, this can make walking and daily activities easier. But TAR surgery doesn't replace every joint in the foot, guarantee a normal range of motion, or make the implant last forever. It also doesn't replace the need for ankle fusion. Both surgeries are important options for treating severe ankle arthritis.
