PMID: 9605234May 30, 1998Paper

Mechanical comparison of two external fixator clamp designs

Veterinary Surgery : VS
K H KrausW M Rand

Abstract

To compare two external fixation clamp designs for their ability to resist movement of a fixation pin in relation to the connecting rod. Two designs of external fixator clamps were attached to connecting rods mounted on a jig for mechanical testing. Fixator pins were placed perpendicular to the connecting rod. A mechanical testing machine was used to deflect each 3.2-mm pin at a distance that was 25 mm from the center of the clamp bolt. Both clamp designs were tightened to 4.4, 6.1, and 7.8 newton-meters (N x m) torque, and loads were applied in a position ramp through 4 mm and resisting loads were measured. Two clamp orientations were used during load application, such that the deflection of the pin tended to tighten the clamp bolt or tended to loosen the clamp bolt. The tests were videotaped to determine mode of failure. Comparisons of the load/displacement curves for the two external fixator clamp designs were made using nonlinear equational curve fitting methods. The resultant plateau and rise coefficients were compared using analysis of variance. Slippage of the pin in relation to the clamp occurred with the Kirschner-Ehmer clamp tightened to 4.4, 6.1, and 7.8 N x m, and slipping of the pin in relation to the clamp occurre...Continue Reading

References

Jan 1, 1992·The Veterinary Clinics of North America. Small Animal Practice·G D Pettit
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Citations

Apr 17, 2001·The Journal of Small Animal Practice·D D LewisM A Anderson
May 21, 2011·Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T·H GriffinR H Browne
May 23, 2015·Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T·S K TyagiD N Madhu
Jun 23, 2009·Veterinary Surgery : VS·Robert S GilleyLouis J Soslowsky
Sep 30, 1999·The Veterinary Clinics of North America. Small Animal Practice·A L Johnson, C E DeCamp
Jul 10, 2001·Veterinary Surgery : VS·R S GilleyJ E Bechtold
Dec 3, 2003·Veterinary Surgery : VS·David T WhiteRobert D Welch

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