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Mechanical Evaluation of Pin and Tension-Band Factors in a Delrin Olecranon Osteotomy Model

Neat, Benjamin Carlton
http://rave.ohiolink.edu/etdc/view?acc_num=osu1396456133

Abstract Details

2006, Master of Science, Ohio State University, Veterinary Clinical Sciences.
Pin and tension-band wire (PTBW) fixation is the most common method of repair for simple olecranon fractures and osteotomies despite relatively high rates of complications reported with this technique. A two-phase mechanical study was undertaken to evaluate the effect of altering PTBW fixation variables in Delrin® plastic olecranon osteotomy models. In Phase I, six fixation variables, including 1) pin and 2) wire diameter, 3) distal and 4) proximal wire position, 5) wire configuration, and 6) osteotomy angle, were assessed using linearly ramped loads. Wire diameter and wire configuration, the two variables with the greatest positive impact in Phase I, were further evaluated using cyclic loads in Phase II. In Phase I a single control configuration was defined. By altering each of the six variables, one at a time, eleven test configurations were created. The control was cut obliquely and stabilized with a 1.0-mm figure-of-eight wire passed around two 1.6-mm pins. Alternative wire diameters (0.8 and 1.25 mm), pin diameters (1.1 and 2.0 mm), distal wire positions (cranial, distal, proximal), proximal wire position (additional proximal hole), wire configurations (lateral and combined figure-of-eight/lateral), and osteotomy angle (transverse) were assigned to the test configurations. Tensile force was applied to each model while displacement at the caudal aspect of the osteotomy was measured with an extensometer. The strength of each test configuration was compared to that of the control at four osteotomy displacements (0.03, 0.14, 1, and 2 mm) in terms of tensile load and strain energy. Models with larger wire, pins, or combined figure-of-eight/lateral wires were stronger than the control, while those with smaller wire, pins, or a solitary lateral wire were weaker. The greater strength of the larger wire was apparent at all displacements assessed. Based on their superior strength in Phase I, the 1.25-mm wire and combined figure-of-eight/lateral configurations were selected for further comparison to the 1.0-mm control in Phase II. Delrin® olecranon osteotomy models were repaired with one of these three configurations and then subjected to cyclic loading while caudal osteotomy displacement was measured with an extensometer. The three groups were compared in terms of cycles to failure, mean minimum displacement, mean maximum displacement, and mean displacement per cycle. Models with an additional lateral wire survived significantly more cycles than those with a solitary 1.0-mm figure-of-eight wire, although caudal osteotomy gaps were not significantly different. Conversely, models with 1.25¬-mm wire allowed significantly smaller minimum and maximum displacements than those with 1.0-mm wire, but did not survive significantly more cycles. It therefore appears that clinical use of 1.25-mm wire may improve stability, while use of an additional lateral wire may improve durability.
Michael P. Kowaleski (Advisor)
Alan S. Litsky (Committee Member)
Jonathan Dyce (Committee Member)
44 p.
Veterinary Services

Recommended Citations

Citations

  • Neat, B. C. (2006). Mechanical Evaluation of Pin and Tension-Band Factors in a Delrin Olecranon Osteotomy Model [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1396456133

    APA Style (7th edition)

  • Neat, Benjamin. Mechanical Evaluation of Pin and Tension-Band Factors in a Delrin Olecranon Osteotomy Model. 2006. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1396456133.

    MLA Style (8th edition)

  • Neat, Benjamin. "Mechanical Evaluation of Pin and Tension-Band Factors in a Delrin Olecranon Osteotomy Model." Master's thesis, Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1396456133

    Chicago Manual of Style (17th edition)

osu1396456133
289
© 2006, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.