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Holding Power of Threaded External Skeletal Fixation Pins in the Near and Far Cortices of Cadaveric Canine Tibiae
Author(s) -
MCDONALD DARRYL E.,
PALMER ROSS H.,
HULSE DONALD A.,
NEIGUT JOSEPH S.,
HYMAN WILLIAM A.,
SLATER MARGARET R.
Publication year - 1994
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.1994.tb00510.x
Subject(s) - cadaveric spasm , medicine , anatomy , fixation (population genetics) , environmental health , population
We compared the pin‐bone interfaces at the near and far cortical penetration sites of positive‐profile end‐threaded external fixation pins in cadaveric canine tibiae. The holding power of the pins in each cortical surface was independently measured in 21 pin‐bone sections. Scanning electron microscopy (SEM) was used to compare subjectively the microstructural appearance of the pin‐bone interfaces at the near and far cortical penetration sites in eight pin‐bone sections. The far cortical penetration site provided greater holding power than did the near cortical site. SEM evaluation suggested more bony microfractures and debris with less pin‐bone interlock in the near cortical penetration sites than in the corresponding far cortical penetration sites. This study showed that after low‐speed power insertion of positive‐profile end‐threaded pins in canine cadaveric tibiae, the near cortical penetration site contributes approximately 25% less to the overall holding power of the pin than does the far cortical penetration site.