Abstract
BackgroundThe aim of this study was to design a new minimally invasive percutaneous lag screw guide apparatus and to verify its adjuvant treatment of acetabular anterior column fracture on pelvis specimens.MethodsThis guide apparatus was self-developed based on the principles of “two points form a line” and “Rectangle”. Using C-arm fluoroscopy, this guide apparatus was used to conduct minimally invasive percutaneous lag screw internal fixation of acetabular anterior column fractures. Ten hollow lag screws were placed into 5 pelvis specimens.ResultResult showed no sign of any screws puncturing the cortex or entering into the hip joint on radiological assessment. The cross-section reconstructed vertical distance to the screw, on the cross-section acetabular notch and the cross-section of the screw where the distance of between the screw and the iliopectineal line’s arc roof was at its shortest, indicate that at all points (T, R-r) under the line with an inclination of 1 (namely T = R-r) the screw is within the cortex and does not puncture the acetabula anterior column or enter into the hip joint.ConclusionsWe may conclude that this self-developed guide apparatus solves the screw precision problem during the treatment of acetabular anterior column fractures through a minimally invasive percutaneous lag screw.
Highlights
The aim of this study was to design a new minimally invasive percutaneous lag screw guide apparatus and to verify its adjuvant treatment of acetabular anterior column fracture on pelvis specimens
We may conclude that this self-developed guide apparatus solves the screw precision problem during the treatment of acetabular anterior column fractures through a minimally invasive percutaneous lag screw
Based on the structure of the rectangle, which shows that the length of the corresponding two sides are equal, the minimally invasive percutaneous lag screw guide apparatus is developed and is expected to solve the difficult problem that the hollow screw cannot be placed successful in the acetabula anterior column (Fig. 1)
Summary
The aim of this study was to design a new minimally invasive percutaneous lag screw guide apparatus and to verify its adjuvant treatment of acetabular anterior column fracture on pelvis specimens. Using C-arm fluoroscopy, this guide apparatus was used to conduct minimally invasive percutaneous lag screw internal fixation of acetabular anterior column fractures. For traditional treatment of displacement or slightly displacement acetabula anterior column, minimally invasive percutaneous the lag screw technique is generally divided into anterograde and retrograde techniques. A vast majority of domestic and foreign scholars have studied the entry point and puncture angle of the anterograde and retrograde techniques [3,4,5,6,7,8,9]. For the traditional minimally invasive percutaneous lag screw technique, the position of entry point is always determined first, followed by the direction. The puncture angle has strong subjectivity, because there is no supporting point in the acetabular and no correct direction when the guiding needle drilled during the operation
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