Greenwood police say 48-year-old Michelle Thomas called them Monday night and said she grabbed a knife and stabbed her boyfriend after he hit her.
Thomas said she swung the knife at him, then pulled off his prosthetic leg and tossed it and a spare leg out the door before calling police.
Authorities say the boyfriend told them Thomas had attacked him for no reason. He was treated at a hospital for cuts to his hands and leg.
Thomas has been charged with aggravated criminal domestic violence and has been released from jail. She declined to comment on her case Wednesday when reached by phone.