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A new radiographic method for evaluating the degree of sliding in devices used in hip-fracture surgery

Lunsjö, Karl LU ; Åström, K. LU ; Stigsson, L. LU ; Sparr, G. LU ; Hauggaard, A. LU ; Heyden, A. LU ; Ceder, L. and Spanne, S. LU (1997) In Acta Radiologica 38(6). p.1057-1062
Abstract

Purpose: To find a practical method for estimating the degree of sliding that occurs in screw-plate devices used in hip-fracture surgery. Greater understanding of the sliding mechanisms in different fracture types should improve surgical technique and reduce the failure rate. Methods and Results: In dynamic screw-plate devices, the lag screw slides inside the barrel of the plate. A recent innovation allows the barrel-plate to slide inside a side-plate, thus making possible a combined fracture compression along the neck and the shaft of femur. The lengths of the different parts and the angle of a device in vivo, measured on a radiograph, depend on the position of the femur relative to the photographic film and the roentgen source. We... (More)

Purpose: To find a practical method for estimating the degree of sliding that occurs in screw-plate devices used in hip-fracture surgery. Greater understanding of the sliding mechanisms in different fracture types should improve surgical technique and reduce the failure rate. Methods and Results: In dynamic screw-plate devices, the lag screw slides inside the barrel of the plate. A recent innovation allows the barrel-plate to slide inside a side-plate, thus making possible a combined fracture compression along the neck and the shaft of femur. The lengths of the different parts and the angle of a device in vivo, measured on a radiograph, depend on the position of the femur relative to the photographic film and the roentgen source. We obtained these measurements with a ruler and a protractor from sequential a.p. radiographs of the hip and implemented them in a special computerized program that used the principles of the scaled orthographic and the central projection models. These calculations provided the correct amount of sliding by the lag screw and by the barrel-plate within the side-plate. Conclusion: The method presented here can establish the real degree of sliding in screw-plate devices from standard a.p. radiographs independently of the position of the hip.

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author
organization
publishing date
type
Contribution to journal
publication status
published
keywords
Hip fractures, radiography, Implants, mathematics
in
Acta Radiologica
volume
38
issue
6
pages
6 pages
publisher
John Wiley & Sons
external identifiers
  • scopus:0031279366
ISSN
0284-1851
language
English
LU publication?
yes
id
534b3581-46b3-4a72-a318-9a7cc9ac9735
date added to LUP
2019-01-22 11:16:39
date last changed
2019-05-24 19:25:56
@article{534b3581-46b3-4a72-a318-9a7cc9ac9735,
  abstract     = {<p>Purpose: To find a practical method for estimating the degree of sliding that occurs in screw-plate devices used in hip-fracture surgery. Greater understanding of the sliding mechanisms in different fracture types should improve surgical technique and reduce the failure rate. Methods and Results: In dynamic screw-plate devices, the lag screw slides inside the barrel of the plate. A recent innovation allows the barrel-plate to slide inside a side-plate, thus making possible a combined fracture compression along the neck and the shaft of femur. The lengths of the different parts and the angle of a device in vivo, measured on a radiograph, depend on the position of the femur relative to the photographic film and the roentgen source. We obtained these measurements with a ruler and a protractor from sequential a.p. radiographs of the hip and implemented them in a special computerized program that used the principles of the scaled orthographic and the central projection models. These calculations provided the correct amount of sliding by the lag screw and by the barrel-plate within the side-plate. Conclusion: The method presented here can establish the real degree of sliding in screw-plate devices from standard a.p. radiographs independently of the position of the hip.</p>},
  author       = {Lunsjö, Karl and Åström, K. and Stigsson, L. and Sparr, G. and Hauggaard, A. and Heyden, A. and Ceder, L. and Spanne, S.},
  issn         = {0284-1851},
  keyword      = {Hip fractures, radiography,Implants, mathematics},
  language     = {eng},
  month        = {12},
  number       = {6},
  pages        = {1057--1062},
  publisher    = {John Wiley & Sons},
  series       = {Acta Radiologica},
  title        = {A new radiographic method for evaluating the degree of sliding in devices used in hip-fracture surgery},
  volume       = {38},
  year         = {1997},
}