Gait Acquisition with a Quadrilateral Socket after Ultra-short Transfemoral Amputation because of Staphylococcal Toxic Shock Syndrome.

Background: Streptococcal toxic shock syndrome (STSS) is a notifiable disease under Japan's Infectious Disease Control Law and has become a pandemic following COVID-19. STSS often leads to necrotizing fasciitis, with a mortality rate exceeding 30%. Even in surviving patients, limb amputations are common.