Igor, a 13-year-old Siberian tiger, received stem-cell treatment to heal hip joint pains at a Hungarian zoo on Wednesday. /VCG Photo

It was the first lipogems self-cell procedure performed on a Siberian tiger. Fatty tissue taken from the tiger containing regenerative stem cells was applied to its joints. /VCG Photo 

The treatment is used more widely on humans than animals. /VCG Photo

A Siberian tiger can usually live up to 20 years./VCG Photo