A pretensionable locking system, a method for producing a locking system and a medical-technical instrument including a locking system. The locking system (2) includes a locking body (10) with an inner thread (12), and an inner locking body (20) with an outer thread (22). In a pretensioned position, the inner thread lies against the outer thread in a first longitudinal axial direction (80) and is pretensioned against the outer thread. In a locked position, the outer locking body is fixed on the inner locking body by screwing the inner thread onto the outer thread. The outer locking body has a resilient retaining element (14) that projects radially inward, and the inner locking body has a rigid bulge (24) that projects radially outward. In the pretensioned position, the retaining element lies against the bulge in a second longitudinal axial direction (85) that is opposite the first longitudinal axial direction.

A transverse connector includes a cross member assembly, a first connector assembly, and a second connector assembly. The cross member assembly includes a cross member, a first ring, and a second ring. The cross member has a first end portion and a second end portion. The first ring is receivable on the first end portion of the cross member and the second ring is receivable on the second end portion of the cross member. The first and second connector assemblies are coupled to the first and second rings of the cross member assembly, respectively, to support the cross member between the first and second connector assemblies. The first and second connector assemblies are configured to selectively and releasably secure to bone anchors.

A transverse connector includes a cross member assembly, a first connector assembly, and a second connector assembly. The cross member assembly includes a cross member, a first ring, and a second ring. The cross member has a first end portion and a second end portion. The first ring is receivable on the first end portion of the cross member and the second ring is receivable on the second end portion of the cross member. The first and second connector assemblies are coupled to the first and second rings of the cross member assembly, respectively, to support the cross member between the first and second connector assemblies. The first and second connector assemblies are configured to selectively and releasably secure to bone anchors.

A pretensionable locking system, a method for producing a locking system and a medical-technical instrument including a locking system. The locking system (2) includes a locking body (10) with an inner thread (12), and an inner locking body (20) with an outer thread (22). In a pretensioned position, the inner thread lies against the outer thread in a first longitudinal axial direction (80) and is pretensioned against the outer thread. In a locked position, the outer locking body is fixed on the inner locking body by screwing the inner thread onto the outer thread. The outer locking body has a resilient retaining element (14) that projects radially inward, and the inner locking body has a rigid bulge (24) that projects radially outward. In the pretensioned position, the retaining element lies against the bulge in a second longitudinal axial direction (85) that is opposite the first longitudinal axial direction.

A transverse connector includes a cross member assembly, a first connector assembly, and a second connector assembly. The cross member assembly includes a cross member, a first ring, and a second ring. The cross member has a first end portion and a second end portion. The first ring is receivable on the first end portion of the cross member and the second ring is receivable on the second end portion of the cross member. The first and second connector assemblies are coupled to the first and second rings of the cross member assembly, respectively, to support the cross member between the first and second connector assemblies. The first and second connector assemblies are configured to selectively and releasably secure to bone anchors.

A transverse connector includes a cross member assembly, a first connector assembly, and a second connector assembly. The cross member assembly includes a cross member, a first ring, and a second ring. The cross member has a first end portion and a second end portion. The first ring is receivable on the first end portion of the cross member and the second ring is receivable on the second end portion of the cross member. The first and second connector assemblies are coupled to the first and second rings of the cross member assembly, respectively, to support the cross member between the first and second connector assemblies. The first and second connector assemblies are configured to selectively and releasably secure to bone anchors.

An implant having a receiver that is adapted to receive a polyaxial screw in the bore and either an internal or external cap. The cap can be an external or internal cap and the implant further has at least one locking aid in the form of at least one of a tactile feedback, a visual feedback or an enhanced fixation between the cap and a rod that is received in the receiver.

The sacral-iliac joint between an iliac and a sacrum is fused either by the creation of a lateral insertion path laterally through the ilium, through the sacral-iliac joint, and into the sacrum, or by the creation of a postero-lateral insertion path entering from a posterior iliac spine of an ilium, angling through the sacral-iliac joint, and terminating in the sacral alae. A bone fixation implant is inserted through the insertion path and anchored in the interior region of the sacrum or sacral alae to fixate the sacral-iliac joint.

An implant having a receiver that is adapted to receive a polyaxial screw in the bore and either an internal or external cap. The cap can be an external or internal cap and the implant further has at least one locking aid in the form of at least one of a tactile feedback, a visual feedback or an enhanced fixation between the cap and a rod that is received in the receiver.