The present invention concerns an accessory for tensioning an elongate element for attaching an implant to a bone element, comprising a rod having proximal and distal ends and a longitudinal axis L, the distal end of said rod being provided with a bearing device for bearing on the implant. The accessory further comprises a device for tensioning the elongate element, comprising a drum mounted so as to be able to rotate about an axis T, transverse to the axis L, arranged at the proximal end of the rod, the drum comprising a holding portion suitable for cooperating with the elongate element. The tensioning device comprises a device for rotating the drum about the axis T, allowing the elongate element to be tensioned by winding the elongate element around the drum.
