China Manufacturer Veterinary Orthopedic Titanium AO TYPE Mono axial Locking Plate Implant for Cat and dog fragment surgery

The locking plate has a corresponding threaded plate hole.
Note that the screw head is also threaded, unlike the conventional non-lock screw/plate.

During insertion, the locking screw head engages and locks into the threaded plate hole.

 * A locking plate does not have to precisely contact the underlying bone in all areas. When screws are tightened, they "lock" to the threaded screw holes of the plate, stabilizing the segments without pulling the bone to the plate. Locking screws make it
impossible for screw insertion to alter the reduction. Nonlocking plate/screw systems require a precise adaptation of the plate to the underlying bone. Without this close contact, tightening of the screws will pull the bone segments toward the plate,
resulting in loss of reduction and possibly the occlusal relationship
* Locking plate/screw systems do not disrupt the underlying cortical bone perfusion as much as conventional plates, which compress the plate to the cortical bone.

* Screws are unlikely to loosen from the plate. Similarly, if a bone graft is screwed to the plate, a locking head screw will not loosen during the phase of graft incorporation and healing. The possible advantage to this property of a locking plate/screw system is decreased risk of inflammatory complications due to hardware loosening.

* Locking plate/screw systems have been shown to provide more stable fixation than conventional nonlocking plate/screw systems.