Total ankle replacement, also known as total ankle arthroplasty, is a surgical treatment for ankle arthritis that is appropriate for some patients.
Ankle replacement surgery has been an option for many years. Recent advancements in technology and techniques have made it the preferred option for treating patients with ankle arthritis.
Ankle replacement can take away the pain from the arthritis and preserve the motion at the joint. This helps patients perform tasks such as walking on uneven ground and going up and down stairs. It also protects the other joints of the foot to help prevent them from getting arthritis.
A total ankle replacement is the surgical removal of portions of the bones and cartilage that make up the ankle joint. These are replaced with a metal piece in the tibia, another metal piece in the talus, and a plastic piece between the two.
The ankle (known by doctors as the tibiotalar joint) is a complex joint that allows your foot to rotate and pivot in relation to your leg. Three separate bones meet to form the ankle joint. These are the:
Cartilage (cushioning) covers the ends of these bones to allow them to glide together smoothly. If the cartilage in the ankle becomes damaged or wears down due to injury or disease, the bone surfaces will rub each other during movement. This causes osteoarthritis (joint inflammation, or pain and swelling) in the ankle. Over time, the bone-on-bone grinding of osteoarthritis can wear away the bone surfaces, causing bone spurs and stiffness in the joint.
The surface of the tibia and talus that make up the ankle joint is removed. In their place, metal pieces are inserted into the bone. Then, a plastic insert it attached to the metal piece on the tibia. In a replacement, the metal piece on the talus will rub against the plastic piece attached the tibial implant. This takes away the pain for the ankle arthritis and preserves the motion in the joint.
In some cases, part of the talus loses its blood supply and collapses (called avascular necrosis, "AVN" or osteonecrosis). When this happens, the bone is no longer healthy and cannot support an ankle replacement. But there are additional options, depending on how much of the bone is necrotic.
Ankle replacement is for patients who are no longer able to manage their ankle arthritis pain and swelling with nonsurgical treatments such as:
Studies have shown that replacement and fusion offer the same degree of pain relief, but that ankle replacement provides much better function in the ankle by retaining the joint’s flexibility. But in some patients, ankle replacement is not possible, and fusion is the appropriate option.
Before ankle replacement gained acceptance, ankle fusion surgery was the standard treatment for ankle arthritis. In an ankle fusion, the two bones of the ankle, the tibia and the talus, are joined together and held in place with plates and/or screws. Over time, the bones heal together. Once that occurs, the joint will no longer hurt, but will also no longer bend.
There are a variety of reasons why some patients may not be able to have an ankle replacement. It could be that their bone that is too weak, or that they have a deformity or malalignment of the ankle and foot that is not correctable. Replacement is not appropriate for people with certain neuromuscular disorders or those who have Charcot arthropathy – a peripheral neuropathy (loss of sensation) in the foot and ankle. In addition, patients with an active infection are not candidates for ankle replacement and are best treated with a fusion.
Total ankle implants are more anatomic now than years ago. This means that they restore the normal anatomy of the ankle and require that only minimal bone tissue be removed from the ankle. Instruments to perform the surgery have also significantly improved, allowing orthopedic surgeons to be more accurate and perform the surgery more reliably. There has also been significant progress in the medical community’s understanding of how to balance the ligaments of the ankle and align the foot underneath the ankle at the time of ankle replacement. All of these factors have resulted in better outcomes for patients who receive an ankle replacement.
Ankle replacement prostheses are made of titanium, cobalt chromium alloy and polyethylene. For patients with a nickel allergy, a custom all-titanium implant may be an option.
Ankle replacement is performed under regional anesthesia. The leg is made numb for the surgery, and often the numbing medicine will last for a day or two after the surgery, which helps control the pain. Prior to starting the surgery, patients receive medicine to fall asleep during the surgery, but they breathe on their own during the procedure and are not unconscious.
Most patients can go home the same day as their surgery. Some patients may spend one night in the hospital and go home the next day.
At four weeks, most patients can bear some weight on the ankle while wearing a removable boot. At six months, people are usually about 75% recovered. Complete return to activity may take up to a year.
Most patients can walk using a protective boot at four weeks after surgery and can walk wearing a regular shoe at eight weeks. If any additional surgery is needed in the foot at the time of the ankle replacement, then it may be six weeks before walking in a boot and ten weeks before walking in a shoe. The full recovery timeline is discussed below.
People heal at different rates, and your surgeon will guide you through the process. Below are the typical recovery time frames and benchmarks. But these may vary from patient to patient.
Ankle replacement is very successful in alleviating pain and preserving motion at the ankle. Risks of surgery include infection, numbness, blood clots, and the risk that the bone does not heal to the metal pieces.
After ankle replacement, patients can walk, hike, take a stroll on the beach, play golf or doubles tennis, etc. The biggest limitation is to avoid running or jumping, unless it is an emergency.
In 90% of cases, the replacement lasts 10 years. Usually, they will last even longer, but in some cases, the implant may fail in less than 10 years. Ankle replacements can loosen over time. If the metal piece is moving inside the bone, then pain and swelling can occur. If the implant loosens and causes pain, then a second ankle replacement surgery can be performed or the replacement implants can be removed and the ankle fused.
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