First-Ever Talus Replacement Using 3D Printing

It’s been done…the first-ever talus replacement using 3D printing technology. Performed by Mark Myerson, M.D., director of The Institute for Foot and Ankle Reconstruction at Mercy Medical Center, the surgery means that those who receive the 3D-printed talus replacement may regain up to 75% of normal ankle function.

“The talus has limited blood circulation, and when it is fractured, that blood circulation is commonly lost. The result is avascular necrosis (AVN). Over time the bone will crumble and collapse, like a squashed orange. You’re left with a flattened, painful and arthritic ankle. When you remove the dead bone from the ankle you are left with a massive hole. The treatment offered to patients to date has been to fuse the heel to the leg (the tibia) and these results are particularly poor. The patient is left with a stiff ankle without any movement at all. However, we have a new method of treatment which is truly unique, ” Dr. Myerson said in the May 3, 2016 news release.

After a CAT scan the image is reversed and becomes a blueprint for creating the new talus, “to be a match for the abnormal talus with AVN which is removed. 3D printing technology (provided by 4Web Medical) is used to create a new talus to take the place of the dead bone, ” Dr. Myerson said.

Several trial implants, made of plastic, are provided to be inserted to determine the best fit. “Once we decide on the one that fits, we then select the appropriate matched size to insert into the patient, ” Dr. Myerson said. The final prosthesis to be inserted is made of cobalt and chrome.

“This is not an ankle replacement. An ankle replacement may be appropriate for a patient with ankle arthritis, but it cannot be done with patients with avascular necrosis of the talus, ” Dr. Myerson explained.

“If you have a fusion, there is no movement. The talus replacement allows for the movement of both the ankle and subtalar joints which make moving the foot up and down and side to side possible. The talus replacement helps move these joints because it replaces both surfaces. The final result is truly unbelievable, the mobility it affords the patient, enhancing their quality of life. I’ve been practicing orthopedic surgery of the foot and ankle for 32 years and it is rare that something like this comes along that help patients in this way, ” Dr. Myerson said.

Dr. Myerson told OTW, “The technology is available to produce a talus by mirroring from a CT scan of the opposite normal side. Fusion of the ankle is no longer necessary. This is a complicated procedure to perform following AVN (avascular necrosis) of the talus with published poor results.”