Originally published 2020-04-30.
Ryzhik is a ginger tomcat from Siberia who walks on four titanium prosthetic paws. A stray found in the bitter cold of Tomsk, he lost all four feet to frostbite. Veterinary surgeon Sergei Gorshkov and his team in Novosibirsk replaced them with custom implants anchored directly in his leg bones, making him one of the first cats in the world to live on four artificial paws. Footage released by the clinic shows him walking, playing and even tackling stairs.
His story is uplifting, but it also explains a real veterinary technique, why Siberian winters are so hard on street cats, and what this kind of surgery can and cannot do.
Who is Ryzhik?
His name comes from the Russian word for a redhead, and it suits his orange coat. Animal welfare volunteers found him on the streets of Tomsk, a university city in western Siberia where winter temperatures can drop far below minus 30°C. All four of his paws had frozen. The damaged tissue could not be saved, and the feet had to be amputated.
For a cat that has lost one limb, life usually goes on remarkably well: three-legged cats run, jump and climb with little trouble once they recover. Losing all four feet is a very different situation. In the past, such an animal would almost certainly have been put to sleep. Instead, the volunteers took Ryzhik about 200 kilometres to Gorshkov's clinic in Novosibirsk, which had been developing bone-anchored prosthetics for animals.
Ryzhik later stayed on at the clinic, where reporters from Reuters found him in early 2020 living an ordinary, busy cat's life.
How titanium paws are fitted
The method is often compared to dental implants in people. Instead of a prosthetic strapped onto the outside of the leg, a titanium rod is inserted into the remaining bone and allowed to fuse with it. The visible end of the implant passes through the skin and forms the new "foot".
The key steps, as described in reports on Gorshkov's work, are:
- Scanning. CT scans of the cat's legs are used to build a precise 3D model of each bone.
- Custom manufacture. Researchers at Tomsk Polytechnic University design and 3D-print the titanium implants to match each limb.
- Coating. The implants are given a calcium phosphate coating. This porous surface encourages bone to grow into the metal, and it is meant to lower the risk of infection and rejection.
- Staged surgery. Usually the front legs are done first and the hind legs later, giving the animal time to adjust.
Because the implant becomes part of the skeleton, there is nothing for the cat to pull off or chew loose, a common problem with strap-on devices for animals. The hardest part is where metal meets skin, since that junction has to stay clean and healed to keep bacteria out.
Is he really the first?
Reports from 2019 and 2020 sometimes called Ryzhik the world's first cat with four titanium paws. The details are a little more complicated. According to Live Science, the Novosibirsk clinic first fitted Ryzhik with implants in 2016. A grey female called Dymka, found frozen in the snow in Novokuznetsk in December 2018, received four implants in 2019 and was described as only the second cat in the world to do so. Gorshkov himself has described Ryzhik as one of the first cats to have four titanium paws implanted in this way, which is the most careful way to put it.
Some widely shared accounts said Ryzhik's frostbite happened in January 2019 and that his owner brought him in. The reporting we checked points instead to a rescued street cat treated years earlier, so we have followed that account here.
Why frostbite is so common in Siberian cats
Gorshkov has said that his clinic sees several frostbitten cats every winter, typically with damage to paws, ears, noses and tails. In extreme cold, cats try to keep warm by standing on the tips of their toes and curling up, but street cats with no shelter cannot escape the frost for long.
The same risk applies in a milder form anywhere with harsh winters. Practical steps for cat owners and neighbours include:
- Keep pet cats indoors during severe cold spells.
- For community or feral cats, provide an insulated shelter raised off the ground and lined with straw, which stays drier than blankets.
- Check car engines and wheel arches before driving in winter; cats often crawl in for warmth.
- Watch for pale, grey or very cold patches on ears or paws, and talk to a vet promptly if you suspect frostbite rather than trying to warm the area aggressively at home.
What the videos show and what they cannot
Clips released by the clinic show Ryzhik walking around the room, coming down stairs and playing. That is a striking result for a cat with no natural feet. Gorshkov's team reported that the implants integrated with both bone and skin.
(The video originally embedded here is no longer available on YouTube.)
Videos, however, only show a moment. Long-term comfort, the risk of infection at the skin junction and how the implants hold up over years need ongoing veterinary checks. Gorshkov has also said the technique cannot be used for every animal that needs an artificial limb; it depends on how much bone remains, the animal's overall health and the owner's ability to provide follow-up care.
Beyond cats: what the clinic has tried
The Novosibirsk team has used similar bone-anchored implants on small dogs, and reports have described work on prosthetics for birds and other animals. Elsewhere in veterinary medicine, custom 3D-printed implants are becoming more common for dogs and cats with bone cancer or severe injuries.
For pet owners, the realistic takeaway is that amputation is no longer automatically the end of an active life. Many animals do well on three legs without any device. Where all limbs are affected, specialist centres may now have options that did not exist a decade ago, and a conversation with a veterinary orthopaedic surgeon is the place to start.
Sources: Live Science; Reuters report via The Daily Herald; RFE/RL, "The Tomsk Tomcat With Titanium Paws". Photo and video: Sergei Gorshkov's veterinary clinic, Novosibirsk.
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