PMID: 8989714Jan 1, 1997Paper

Mechanical evaluation of four- versus eight-pin halo fixation

Journal of Pediatric Orthopedics
M LettsA Yeadon

Abstract

Fixation of the halo device in the skulls of young children is sometimes compromised because of a thinner cortex and the increased jarring and trauma that small children experience during their everyday activities of life at that age. To assess the increased fixation that an eight-pin halo fixation would provide over the more standard four-pin fixation, the stiffness of fixation of a halo orthosis was evaluated in four dried human cadaver skulls. Two different fixation systems were used: the first one with four pins in the standard locations and the second with four additional pins. A compressive force was applied to the halo ring at a constant rate of 1.27 mm/min. Load and deflection data were recorded simultaneously until a force of 400 N was reached. Results for the two-pin systems were analyzed and compared statistically by using paired t tests. Statistically significant differences were established between the two sets of results with the 8-pin system providing an increase of 24.2% in the stiffness of fixation.

References

Mar 1, 1989·Spine·J A BaumJ Pullekines
Sep 1, 1989·Journal of Pediatric Orthopedics·S J MubarakS R Garfin
Jul 1, 1986·Journal of Pediatric Orthopedics·S R GarfinS L Woo
Jan 1, 1987·Neurosurgery·M L Goodman, P B Nelson
Jun 1, 1985·Surgical Neurology·P Celli, E Palatinsky
Oct 1, 1985·Spine·S R GarfinV L Nickel
Nov 1, 1984·Spine·P S WalkerJ Dietz
Jul 1, 1981·Spine·D E HumbyrdL C Samberg
May 1, 1965·The Australian and New Zealand Journal of Surgery·K G JAMIESON, J D YELLAND

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Citations

Aug 12, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Philippe Lauweryns
Dec 1, 2007·Journal of Children's Orthopaedics·Alexandre ArkaderJohn P Dormans
Dec 20, 2005·Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons·Rodger BrownLarry H Hollier

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