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Vet Comp Orthop Traumatol 1996; 09(01): 1-3
DOI: 10.1055/s-0038-1632493
Original Research
Schattauer GmbH

Screw Torque and Bone Plate Fixation to Equine Cadaver Longbones

J. R. Field
1   From the Equine Research Centre, University of Guelph, Guelph, Ontario, Canada, Uppsala, Sweden
,
S. L. McKee
2   Swedish University of Agricultural Sciences, Uppsala, Sweden
› Author Affiliations
Further Information

Publication History

Received for publication 20 March 1995

Publication Date:
10 February 2018 (online)

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Summary

The purpose of the study was to determine what contribution an individual surgeon, their gender and the location of screw application within the bone makes to the perceived optimal applied screw torque (Mopt) for bone plate fixation to equine cadaver longbones. Five surgeons were required to apply a 4.5 mm broad dynamic compression plate, using 4.5 mm fully-threaded cortical bone screws, to the lateral diaphysis of an equine third metacarpal bone.

Consideration of within (repetition) and between individual differences was significant (P = 0.010, P = 0.0001) as was gender (P = 0.0001) with male surgeons applying higher levels of torque. There did not appear to be a contribution to variability by location (P = 0.065). Regression analysis of Mopt and cortical thickness showed no linear relationship between these parameters (R2 = 0.088), allowing the conclusion that cortical thickness did not influence the perceived optimal applied screw torque.

Screw torque was also measured at point-of-failure (Mmax) showing no relationship to location.

This study examined the contribution of variation within and between individual surgeons, their gender and the location of screw application in the bone on the perceived optimal applied screw torque for bone plate fixation to equine cadaver longbones.

Significant differences were seen within (repetition) and between individuals. When individuals were grouped according to gender significant differences also arose (males applying greater levels of torque than females). The results suggest, that for mature equine longbone fracture repair the use of a torque-limiting device may be a consideration in order to standardize bone plate fixation.

Keywords

Torque - screw - bone plate
 

  • REFERENCES

  • 1 Hearn TC, Surowiak JF, Schatzker J. Effects of tapping on the holding strength of cancellous bone screws. VCOT 1992; 5: 10-2.
    PubMedGoogle Scholar
  • 2 Hughes AN, Jordan BA. The mechanical properties of surgical bone screws and some aspects of insertion practice. Injury 1097; 4: 25-38.
    PubMedGoogle Scholar
  • 3 Frandsen PA, Christoffersen H, Madsen T. Holding power of different screws in the femoral head: A study in human cadaver hips. Acta Orthop Scand 1984; 55: 349-51.
    CrossrefPubMedGoogle Scholar
  • 4 von Arx C. Force transmission through friction in plate osteosynthesis. AO-Bulletin. 1975
    Google Scholar
  • 5 Cordey J, Rahn BA, Perren SM. Human torque control in the use of bone screws. In: Current Concepts of Internal Fixation of Fractures. Uhthoff HK. (ed) Berlin: Springer; 1980: 235-43.
    Google Scholar
  • 6 Cordey J, Florin P, Veihelmann D, Geret V, Perren SM. The control of torque applied to screws and the compression achieved in self compression plates. In Biomechanics V, Asmussen P, Joergensen L. (eds) Baltimore: University Park Press; 1978: 235-43.
    Google Scholar
  • 7 Field JR. Screw torque and interfragmentary compression in equine cadaver longbone fractures. VCOT 1993; 6: 163-5.
    PubMedGoogle Scholar