Abstract: A bone resection device for use in resection of bone during joint replacement surgery comprises a cutting tool housing (4), and at least one cutting tool (6, 8) which is fastened to the housing so that it can be moved reversibly between a retracted position and an extended position, in which it extends further from the housing in the extended position than in the retracted position. The cutting tool housing is attached to an elongate shaft (2) at or towards one end, the shaft having a control region at its other end from which the resection device is controlled while the cutting tool housing is located in the vicinity of bone tissue which is to be resected.