Internal fixation device special for Hoffa fracture

Abstract

The invention provides an internal fixation device special for Hoffa fracture, and belongs to the technical field of medical apparatus. The internal fixation device special for the Hoffa fracture includes a joint-capsule internal anatomical fixation plate and a joint-capsule external anatomical fixation plate, the joint-capsule internal anatomical fixation plate is arc and provided with a first bridge connection hole, a second bridge connection hole is formed in the distal end of the joint-capsule external anatomical fixation plate, a plurality of first positioning screw holes are formed in the joint-capsule internal anatomical fixation plate, and a plurality of second positioning screw holes are formed in the joint-capsule external anatomical fixation plate. The joint-capsule external anatomical fixation plate is fixed above and behind the joint-capsule internal anatomical fixation plate to support the joint-capsule internal anatomical fixation plate, so that the stability of a fracture site is improved, and other traditional internal fixation operations are not influenced. On the basis of the internal fixation device special for the Hoffa fracture, a better Hoffa fracture treating method is provided and is special for complex and severely comminuted fracture; the internal fixation device is conducive to accurately restoring the fracture site and carrying out early functionalexercise, post-knee-operation complications are reduced, and therefore the treating effect on such fracture is improved.

Description

technical field [0001] The special internal fixer for Hoffa fracture belongs to the technical field of medical equipment, and in particular relates to a fracture fixator. Background technique [0002] Hoffa fractures are fractures of the coronal plane of the femoral condyle, accounting for about 8.7% to 13% of distal femoral fractures. It can occur alone but is often accompanied by severe comminuted fractures of the distal femur. At present, the internal fixation methods used for this type of fracture include: Kirschner wire, screw, lateral support plate plus anteroposterior screw, rear anti-slip plate fixation plus posteroanterior screw. Kirschner wires have weak pull-out resistance, are easy to withdraw and loosen, and are generally not recommended except for emergency open surgery. Some physicians use cancellous bone screws or cannulated screws for tension perpendicular to the fracture surface. The disadvantage of screw fixation of Hoffa fractures is that although it c...

AI Technical Summary

Problems solved by technology

The disadvantage of screw fixation of Hoffa fractures is that although it can fix the fracture block, it has poor ability to resist the shear force on the sagittal plane when the knee joint is flexed and extended. In patients with osteoporosis, it is not enough to resist the huge shear force between the tibial plateau and the medial and lateral condyles when the knee is flexed, so most literatures recommend the use of cannulated lag screws combined with bone plate fixation

The rear anti-slip bone plate needs another incision in the rear, which is equivalent to an additional operation, and the anatomical approach is complicated. The distal end of the plate needs to be shaped a lot. Only one screw can be implanted distal to the fracture line, and the distal screw can be implanted Difficult, there are problems such as the distal end of the plastic plate may hinder joint movement and damage the articular surface

The specific types of lateral support plates include T-shaped plates, L-shaped plates, condylar plates, reconstruction plates, etc. After shaping, they are placed inside or outside the femoral condyle and fixed with locking screws. These plates are used in joint capsule Covering the joint capsule externally or partially, due to the large volume of the plate, it is difficult to effectively shape it, and it is not suitable for fine reduction, and when the plate is placed too far and behind, the screw passing through the ligament or its vicinity will affect the joint flexion and extension activities. Comminuted fractures at the distal end and adjacent to the posterior articular surface are difficult to cover effectively, and the scope of application is narrow, so it is not exclusive for Hoffa fractures

[0003] CN205107865U discloses a kind of Hoffa fracture locking steel plate, and its essence is also the lateral support steel plate, judged according to its design principle, it is also placed outside the joint capsule or the superficial surface of the lateral collateral ligament, rather than being close to the side edge of the articular surface, there is also Risk of ligament cuts during knee flexion and extension after screwing in

If it is designed to be miniaturized according to its shape and placed in the joint capsule, its strength is not strong enough to resist the shear force that may easily cause the axial displacement of the fracture, especially for patients with a large fracture fragmentation range, it is difficult to balance fine reduction and effective restoration. Two functions of fixation are only suitable for simple fractures with large fracture fragments, and the scope of application is narrow

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