Background/aim: In the prevention of periarticular heterotopic ossification (HO). a common complication after total hip arthroplasty (THA). nonsteroidal antiinflammatory drugs (NSAID) and irradiation are used. Some theories presume that local hypoxia of the soft tissue causes HO. https://www.sahmbuffy.com/product-category/emergency-batteries-the-lamp-company/