Evaluation of cortical bone damage and axial holding power of nonthreaded and enhanced threaded pins placed with and without drilling of a pilot hole in femurs from canine cadavers.
OBJECTIVE
To evaluate the in vitro axial extraction forces necessary to remove pins and to evaluate mechanical trauma resulting from pin insertion, using various types of pins and insertion techniques.


METHODS
Prospective, controlled study.


METHODS
Femurs of cadavers of dogs.


METHODS
Pins were inserted as follows: 1 nonthreaded pin without drilling of a pilot hole, 1 enhanced threaded pin with drilling of a pilot hole, and 1 enhanced threaded pin without drilling of a pilot hole. After pin insertion, mechanical damage and proper pin insertion was determined by means of radiography. Axial extraction forces were determined for all pins, using a universal testing machine. Mechanical damage was evaluated in 12 additional femurs. After pin insertion, all pins were removed from the bone by use of a low-speed power drill. Samples were sectioned, processed, and evaluated by use of dissecting and scanning electron microscopy.


RESULTS
Using radiography, a significant difference was detected in the number of periosteal trans-cortex fractures between the enhanced threaded and nonthreaded pins. Axial extraction force was not significantly different between the enhanced threaded pins, regardless of insertion technique; however, the axial extraction force was significantly greater for enhanced threaded pins, compared with that for nonthreaded pins. Microfractures only were detected on the periosteum of the trans-cortex of enhanced threaded pins by use of scanning electron microscopy.


CONCLUSIONS
We cannot recommend a particular insertion technique to decrease mechanical trauma to the bone and to increase axial extraction force needed for removal of enhanced threaded pins from the femur of dogs.
Anderson
M A
MA
Department of Veterinary Medicine, College of Veterinary Medicine, University of Missouri, Columbia 65211, USA.
Mann
F A
FA
Kinden
D A
DA
Wagner-Mann
C C
CC
D000818:Animals; D001696:Biomechanical Phenomena; D001858:Bone Nails / Q000592:standards / Q000662:veterinary*; D002102:Cadaver; D004285:Dogs / Q000601:surgery*; D005269:Femur / Q000502:physiology / Q000601:surgery* / Q000648:ultrastructure; D005592:Fracture Fixation / Q000379:methods / Q000662:veterinary*; D008855:Microscopy, Electron, Scanning / Q000662:veterinary; D011446:Prospective Studies