Internal fixator for posterior acetabular wall fractures

Abstract

The invention discloses an internal fixator for posterior acetabular wall fractures and belongs to an internal fixator which comprises pressure plates, a steel plate, lock screws and fastening screws. One side of each pressure plate is provided with a sheet part, and the other side of the pressure plate is provided with a slab part. Each slab part is provided with a screw fixing hole. Each pressure plate is attached to a fracture part of the posterior acetabular wall. The steel plate comprises a plurality of link bars and a plurality of fixing rings. The link bars are connected with the fixing rings in sequence. The fixing rings on two sides of the steel plate form screw fixing holes. Each fixing ring in the middle of the steel plate comprises a threaded fixing hole and a slide way below the threaded fixing hole. The pressure plates are inlaid in the slide ways through the steel plate. The pressure plates are compressed and locked by the lock screws through the threaded fixing holes. The steel plate and the slab parts of the pressure plates are respectively fixed on bone by the fastening screws through the screw fixing holes. The internal fixator has the advantages that the defect that the fractured posterior wall which is fixed cannot be subjected to fracture pressurizing is overcome; fixation is stable; and the fixed positions of the screws are relatively fixed so that screws are prevented from protruding into the acetabulum.

Description

technical field [0001] The invention relates to an internal fixator, in particular to an internal fixator for acetabular posterior wall fractures. Background technique [0002] Acetabular posterior wall fracture is the most common bone injury in daily life, especially with the development of transportation industry and construction industry, it shows an increasing trend. Its pathogenesis is often caused by the patient's hip flexion and violent impact on the knee joint; it is often accompanied by hip dislocation. Due to the severe violence, the fracture fragments are often irregular; and the fracture is an intra-articular fracture; therefore, how to anatomically reduce and fix the fracture of the posterior wall of the acetabulum more simply and firmly, how to shorten the time of fracture fixation and reduce intraoperative trauma and bleeding ; To promote fracture healing has always been the focus and difficulty of orthopedic surgeons. [0003] Hollow cancellous bone screw f...

AI Technical Summary

Problems solved by technology

[0003] Hollow cancellous bone screw fixation has its own defects: the reconstruction of plate fixation requires a relatively large bending of the fixator during the operation, which is complicated to operate and takes a long time

However, it is also fixed on a single plane, and the fixation effect is poor; and the most significant disadvantage is that the screws are likely to protrude into the joint, so the requirements for the surgeon are high, and repeated fluoroscopy observations are required during the operation; During CT re-examination, it was found that some patients still had screws protruding into the joints

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