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A prosthetic leg was a device used in place of real limbs.
After Ram Singh had one of his legs severed by Corakinus in October 2016, he was given a prosthetic one by the Twelfth Doctor which he acquired from the Lothan, who were experts in prosthetic legs. (TV: For Tonight We Might Die) This leg "[did] everything a normal leg does". He still felt pain when he kicked things with it. (TV: Detained)