Device for displacing vertebrae in a spinal column of a living mammal, including at least two engagement elements (2', 2"), positioned at a distance from each other, for engagement with two separate vertebrae, - wherein each one of said engagement elements (2', 2") is carried by a support part (3', 3") having external threads and which in turn is supported in a support portion (4', 4") of a distance unit, said support part and support portion forming a support unit, - wherein the distance unit (5, 5') has means for controlled displacement of the support units in respect of each other in order to alter the degree of separation of said vertebrae - wherein each engagement element (2', 2") extends at an angle (a) with respect to a straight line between two support units, - wherein the engagement elements (2', 2") are elongated and have substantially longitudinal axes, - wherein at least one of said support units includes an arrangement for altering said angle, and - wherein each said arrangement for altering said angle includes an actuating unit (7', 7", 9', 9", 10', 10") which is maneuverable for adjustment of said angle (a) individually in respect of the support part, characterized in - that the actuating unit includes a sleeve (7', 7") on one of the support part and the support portion, which sleeve is acting against a surface portion (10', 10") on the other one of the support part and the support portion, wherein the sleeve has internal threads for engagement with the external threads of the support part and having an end surface (9', 9"), the end surface is co-operating with a cam surface situated on the surface portion, and the sleeve is configured to rotate and thereby axially displace the support part and correspondingly along the engagement element, - that one of the support part and the support portion includes a pivotal (13', 13") pin which is in pivotal cooperation with a bearing (15', 15") being included in the other one of the support part and the support portion. - wherein each one of said engagement elements (2', 2") is carried by a support part (3', 3") having external threads and which in turn is supported in a support portion (4', 4") of a distance unit, said support part and support portion forming a support unit, - wherein the distance unit (5, 5') has means for controlled displacement of the support units in respect of each other in order to alter the degree of separation of said vertebrae - wherein each engagement element (2', 2") extends at an angle (a) with respect to a straight line between two support units, - wherein the engagement elements (2', 2") are elongated and have substantially longitudinal axes, - wherein at least one of said support units includes an arrangement for altering said angle, and - wherein each said arrangement for altering said angle includes an actuating unit (7', 7", 9', 9", 10', 10") which is maneuverable for adjustment of said angle (a) individually in respect of the support part, characterized in - that the actuating unit includes a sleeve (7', 7") on one of the support part and the support portion, which sleeve is acting against a surface portion (10', 10") on the other one of the support part and the support portion, wherein the sleeve has internal threads for engagement with the external threads of the support part and having an end surface (9', 9"), the end surface is co-operating with a cam surface situated on the surface portion, and the sleeve is configured to rotate and thereby axially displace the support part and correspondingly along the engagement element, the sleeve has internal threads for engagement with the external threads of the support part and having an end surface (9', 9"), the end surface is co-operating with a cam surface situated on the surface portion, and the sleeve is configured to rotate and thereby axially displace the support part and correspondingly along the engagement element, - that one of the support part and the support portion includes a pivotal (13', 13") pin which is in pivotal cooperation with a bearing (15', 15") being included in the other one of the support part and the support portion.