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Method for determining the stability of an orthopedic device composed of an external fixation bar during setting of bone fractures

  • US 4,576,158 A
  • Filed: 01/10/1984
  • Issued: 03/18/1986
  • Est. Priority Date: 01/28/1983
  • Status: Expired due to Fees
First Claim
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1. A method for determining the stability of an orthopedic assembly produced by means of an external fixation, characterized by the use of a fixation bar connected by clamps to pins within bone fragments provided with five assemblies of strain gauges having at least one gauge each;

  • said method comprising the steps of measuring the torsion of the bar via one of said five assemblies, measuring two perpendicular components of the bending of the bar at two points of said bar via the remaining two pairs of said assemblies, and determining by means of said strain gauges the amount of the torsion and the amount of the bending at the level of the clamps which connect the fixation bar to the pins, and by the comparison of the determined levels of torsion and bending with those capable of causing sliding in the clamps, determining the extent of stability of said orthopedic assembly.

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