Abstract: A measuring adapter for a measuring instrument for use in connection with hip prosthesis surgery comprises a measuring head and a connector. The measuring head comprises a front end, a rear end and convex upper surface and is divided into at least two separate sections. The measuring head comprises an axially extending central through-going bore adapted to receive an actuating rod. The measuring head is expandable from a relaxed state to an expanded state by axially displacing the actuating rod in the central through-going bore. The connector is hollow and divided at one end in axial direction of the measuring head into a number of legs corresponding to the number of separate sections of the measuring head; each leg being connected to one of the sections of the measuring head. At least a part of the upper surface of the measuring head is adapted, when in the expanded state, to adopt the shape of a spherical cap or a convex shape comprising at least a spherical segment.

Abstract: A measuring adapter (1) for a measuring instrument for use in connection with hip prosthesis surgery is provided. The measuring adapter (1) comprises a measuring head (2) and a connector (3); the measuring head (2) comprises a front end (2a), a rear end (2b) and an upper surface (4a). The upper surface (4a) is convex. The measuring head (2), along an axial direction of the measuring adapter (1), further comprises a central through-going bore (5) adapted to receive an actuating rod (8). The measuring head (2) is adapted to expand from a relaxed state to an expanded state when the actuating rod (8) is axially displaced in the central through-going bore (5); and the measuring head (2) is divided into at least two separate sections (6). The connector (3) is hollow and slotted at one end in axial direction of the measuring head (2) into a number of legs (7), the number of legs (7) corresponding to the number of the at least two separate sections (6) of the measuring head (2).