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Abstract

OBJECTIVE

The objective of this study is to compare drilling variables and torsional mechanical properties of rabbit femora after bicortical drilling with a 1.5-mm standard surgical drill bit, acrylic drill bit, and K-wire.

SAMPLES

24 pairs of rabbit femora.

METHODS

After drilling under controlled axial displacement rate, each bone was biaxially loaded in compression followed by rapid external torsion to failure. Maximum axial thrust force, maximum drill torque, integral of force and displacement, change in temperature, maximum power spectral density of the torque signal, torque vibration, and torque and angle at the yield and failure points were collected. Pre- and postyield stiffness, yield and failure energies, and postyield energy were calculated.

RESULTS

The work required to drill through the cis- and transcortices (integral of force and displacement) was greater for the K-wire, followed by the acrylic and then standard drill bits, respectively. The K-wire demonstrated higher maximum torque than the drill bits at the ciscortex, and the force of drilling was significantly greater. The vibration data was greater with the acrylic and standard drill bits than the K-wire. There was no difference in torsional strength between drilling types.

CLINICAL RELEVANCE

Mechanical differences exist between different drill bits and K-wire and demonstrate that the K-wire is overall more damaging than the surgical drill bit.

Open access
in American Journal of Veterinary Research

torsional properties would not differ between constructs that included a FESSA and those that included an acrylic connecting bar when used with 2 IP and TP combinations. Materials and Methods Preliminary experiments One construct that comprised an

Full access
in American Journal of Veterinary Research

instability, compared with torsional instability for a traditional ILN of similar size. The purpose of the study reported here was to describe a novel hourglass-shaped ILN and locking system and compare the torsional properties of constructs implanted with

Full access
in American Journal of Veterinary Research

the study reported here was to describe the axial compressive and torsional mechanical properties of the tibiotarsal bones of red-tailed hawks. We hypothesized that the torsional properties of those bones would be positively correlated with their

Full access
in American Journal of Veterinary Research

. 10.1002/jbm.820050106 6. Bynum D Ray DR Ledbetter WB , et al Torsional properties of equine metacarpus . J Mater 1971 ; 6 : 234 – 249 . 7. Turner AS Mills EJ Gabel AA . In vivo measurement of bone strain in the horse . Am J Vet

Full access
in American Journal of Veterinary Research

-locking screws on the torsional properties of a locking-plate construct . Vet Comp Orthop Traumatol 2010 ; 23 : 7 – 13 . 10.3415/VCOT-09-05-0055 15. Bennert BM , Kircher PR , Gutbrod A , et al. Evaluation of two miniplate systems and figure

Full access
in American Journal of Veterinary Research