Dynamic compression locking plate for treatment of femoral neck fracture

Abstract

The invention provides a dynamic locking plate for treating a fracture of a neck of a femur. The dynamic locking plate comprises a tuberosity supporting plate and three locking screw holes, wherein the inner surface of the tuberosity supporting plate is bent to be matched with the lower part of a greater trochanter of the femur in shape; the positions of the three locking screw holes including a first locking screw hole, a second locking screw hole and a third locking screw hole in the tuberosity supporting plate are based on a locating point A at the middle of the tuberosity supporting plate, and distributed around the locating point A; the first locking screw hole, the second locking screw hole and the third locking screw hole are distributed to form a triangle in the tuberosity supporting plate; axes of the three locking screw holes are parallel; based on a vertical line AO of the tuberosity supporting plate where the locating point A is positioned, the axial lines of the three locking screw holes are inclined upwards and form longitudinal included angles theta with the vertical line AO, which are equal to 15-35 degrees. The locating point A is located within the range that the geometric center of the tuberosity supporting plate is taken as a center, and the diameter is 4 mm. The dynamic locking plate enables the broken end of a fractured bone to be subjected to micro-movement and compression, and adapts to dynamic characteristics of bone growth when improving the internal fixation stability of the neck of the femur, so as to be more beneficial to healing of the broken end of the fractured bone.

Description

Technical field [0001] The invention relates to a dynamic compression locking plate for treating femoral neck fractures, which is used for treating femoral neck fractures and belongs to medical orthopedic instruments. Background technique [0002] The treatment of femoral neck fractures is divided into conservative treatment and surgical treatment. For unstable femoral neck fractures, surgical treatment is generally used. For patients under 65, surgical reduction and internal fixation are often used. At present, the internal fixation treatment of femoral neck fractures mostly uses three hollow screws. The needle is inserted from the lower tuberosity of the femur, through the tuberosity of the femur, the neck of the femur to the head of the femur, to achieve the effect of fixing the fracture end. Although this technology can fix the fracture end under compression, it has obvious shortcomings because the three hollow screws are not connected to each other, and there is no other su...

AI Technical Summary

Problems solved by technology

Although this technology can pressurize and fix the broken end of the fracture, but because the three hollow screws are not connected with each other, and there is no other support and fixation, there are obvious deficiencies: 1. Poor stability, the anti-rotation force and anti-rotation force of the three hollow screws Poor torsion force is prone to femoral head displacement, resulting in femoral neck nonunion or bone malunion; 2. The rate of long-term femoral head necrosis is high; 3. During the healing process of the femoral neck, the femoral neck is prone to shortening, Leading to withdrawal of the pin and shortening of the lower limbs, affecting walking; 4. A longer period of bed rest is required, and early weight-bearing exercises cannot be performed

The supporting part of the locking plate has one to two screws and the bone at the distal end of the fracture (the end far away from the heart, that is, the end of the trochanter), so that the proximal end of the fracture (the end of the fracture near the heart, that is, the end of the femoral head), The distal end, the locking plate and the locking screw are integrated into one, which is a stable fixation, but this kind of fixation does not pressurize and fix the broken end of the fracture, and the broken end of the fracture is a kind of static fixation, which blocks the transmission of force and is not conducive to fracture. Stimulation of end force and growth of callus, bone resorption easily occurs at the fracture end and causes bone nonunion

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