Title page for ETD etd-11082011-094452

Type of Document Master's Thesis
Author Baia, Petrisor
Author's Email Address pbaia@vetmed.lsu.edu
URN etd-11082011-094452
Title Mechanical Evaluation of Roughened Screws in Equine Third Metacarpal Bone
Degree Master of Science (M.S.)
Department Veterinary Clinical Sciences
Advisory Committee
Advisor Name Title
Sod, G. Gary Committee Chair
Burba, J.Daniel Committee Co-Chair
Riggs, M. Laura Committee Member
  • torque
  • roughened screw
  • bone
  • equine
Date of Defense 2011-10-21
Availability unrestricted

Objectives To compare the osseointegration of roughened and electropolished 5.5 mm cortical

screws used to secure a 4.5 mm broad dynamic compression plate (DCP) in equine third metacarpal (MC3) bones.

Study Design In vivo study

Animals 5 Adult thoroughbred horses (2-7 years old).

Methods For each horse one MC3 was randomly assigned to secure a 4.5 mm broad DCP with

4aluminum oxide (Al2O3) roughened screws on the dorsal mid diaphysis. Four regular electropolished screws used to secure a similar plate on the contralateral limb served as control. They were removed at 12 weeks and the extraction torque was recorded. A paired t-test was used for comparison and statistical significance was set at p < 0.05.

Results At 12 weeks, the mean extraction torque for roughened screws was significantly greater (p < 0.0002) when compared to regular AO screws. The roughened screws had a mean extraction torque of 3.24 0.56 N-m, which was twice the mean extraction torque of the AO screws (1.65 0.34 N-m).

Discussion/Conclusions Bone tissue infiltrates the pores of the roughened screws increasing the contact surface and the mechanical anchorage. In our study the screw surface roughness is 2.14 0.48 m. This roughness has the lowest pore size that will interact with the surrounding bone without altering the screw dimensions. We found that Al2O3 roughened screws have a significantly greater removal torque when compared to the electropolished AO cortical screws when removed at 12 weeks post implantation.

Clinical relevance - Information obtained from this study may help in improving the contact surface of implants and subsequent fixation and stability of bone-implant construct in equine fracture repair.

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