A bone plate (600; 800) which is intended to be implanted at the olecranon for the internal fixation of a fracture at the proximal ulna, the plate comprising: (a) a body portion having a distal end, a proximal end (604; 804), a longitudinal axis, a medial edge and a lateral edge and defining a plurality of threaded holes (622, 624, 626, 628; 822, 824, 826, 828), (b) a head portion positioned on the proximal end of the body portion, the head portion widening away from the body portion to define a transverse axis oriented perpendicular to the longitudinal axis, the head portion including two threaded holes (630, 632; 830, 832) arranged on opposite sides of the longitudinal axis and along the transverse axis, (c) a proximal arm (620; 820) smaller in width than the head portion, the proximal arm extending proximally from the head portion and including a proximal ring element (640; 822) attached to the head portion by a proximal bendable bridge element (646; 846), such that the proximal arm is reconfigurable in a plane containing the longitudinal axis and perpendicular to the top surface, the proximal ring element including a threaded hole, in which each threaded hole defines a thread axis that can receive a fixed-angle locking fastener for attaching the bone plate to the bone, and in which the axes of the two threaded holes of the head portion are transversely offset from a thread axis of the threaded hole of the proximal ring element and are oriented to direct the fixed-angle locking fasteners in slightly divergent trajectories, such that when the proximal arm is reconfigured in the plane in a direction to result in the thread axes of the two threaded holes of the head portion converging with the thread axis of the threaded hole of the proximal ring element, the thread axis of the proximal ring element passes between the thread axes of the two threaded holes of the head portion, (d) a first arm (616; 618; 816; 818) extending from the body portion in one of medial and lateral directions and including a first ring element (636; 638) attached to one of the medial and lateral edges of the body portion by a first bendable bridge element (642; 644), in which the first ring element includes a threaded hole (637; 639) defining a thread axis for receiving a fixed-angle locking fastener, the first ring element and its thread axis being oriented to direct the fixed-angle locking fastener in a trajectory which is angled towards the longitudinal axis. (a) a body portion having a distal end, a proximal end (604; 804), a longitudinal axis, a medial edge and a lateral edge and defining a plurality of threaded holes (622, 624, 626, 628; 822, 824, 826, 828), (b) a head portion positioned on the proximal end of the body portion, the head portion widening away from the body portion to define a transverse axis oriented perpendicular to the longitudinal axis, the head portion including two threaded holes (630, 632; 830, 832) arranged on opposite sides of the longitudinal axis and along the transverse axis, (c) a proximal arm (620; 820) smaller in width than the head portion, the proximal arm extending proximally from the head portion and including a proximal ring element (640; 822) attached to the head portion by a proximal bendable bridge element (646; 846), such that the proximal arm is reconfigurable in a plane containing the longitudinal axis and perpendicular to the top surface, the proximal ring element including a threaded hole, in which each threaded hole defines a thread axis that can receive a fixed-angle locking fastener for attaching the bone plate to the bone, and in which the axes of the two threaded holes of the head portion are transversely offset from a thread axis of the threaded hole of the proximal ring element and are oriented to direct the fixed-angle locking fasteners in slightly divergent trajectories, such that when the proximal arm is reconfigured in the plane in a direction to result in the thread axes of the two threaded holes of the head portion converging with the thread axis of the threaded hole of the proximal ring element, the thread axis of the proximal ring element passes between the thread axes of the two threaded holes of the head portion, (d) a first arm (616; 618; 816; 818) extending from the body portion in one of medial and lateral directions and including a first ring element (636; 638) attached to one of the medial and lateral edges of the body portion by a first bendable bridge element (642; 644), in which the first ring element includes a threaded hole (637; 639) defining a thread axis for receiving a fixed-angle locking fastener, the first ring element and its thread axis being oriented to direct the fixed-angle locking fastener in a trajectory which is angled towards the longitudinal axis.