Comparison of pull-out resistance of Kirschner wires and Imex™ miniature interface fixation half pins in polyurethane foam

K. M. Sandman; C. W. Smith; J. Harari; S. Manfra Marretta; G. J. Pijanowski; D. J. Schaeffer

doi:10.1055/s-0038-1632708

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2002; 15(01): 18-22
DOI: 10.1055/s-0038-1632708

Original Research

Schattauer GmbH

Comparison of pull-out resistance of Kirschner wires and Imex™ miniature interface fixation half pins in polyurethane foam

K. M. Sandman

¹Mobile Animal Surgical Service, Lincolnshire, IL, USA

,

C. W. Smith

²Small Animal Surgery, Department of Veterinary Clinical Medicine College of Veterinary Medicine University of Illinois, USA

,

J. Harari

³Veterinary Referral Services, Spokane, WA, USA

,

S. Manfra Marretta

²Small Animal Surgery, Department of Veterinary Clinical Medicine College of Veterinary Medicine University of Illinois, USA

,

G. J. Pijanowski

⁴Department of Veterinary Biosciences, College of Veterinary Medicine University of Illinois, USA

,

D. J. Schaeffer

⁵Toxicology and Biostatistics, Department of Veterinary Biosciences, College of Veterinary Medicine University of Illinois, USA

› Author Affiliations

Abstract

Summary

The pin-bone interface is critical in maintaining a stable external skeletal fixator to allow bony union and prevent complications related to loose pins (3, 7, 13, 14, 16, 17). Threaded pins have increased pull-out strength in comparison to smooth pins and have improved the bone-pin interface (1, 2, 4, 12, 16, 21). Pull-out strengths were compared between smooth Kirschner size pins and Imex™ Miniature Interface Fixation Half Pins in a polyurethane foam bone model. The negative profile end threaded pins had significantly higher pull-out strengths (p <0.001) than smooth pins. Increasing the diameter of the pin and the length of engagement also increased the pull-out strengths of both pin types. Improving the pull-out strength of pins should minimize morbidity of external skeletal fixators used in repair of mandibular/maxillary fractures or long bone repairs on small and exotic patients.

Keywords

External Skeletal Fixator - Negative Profile Pins - Kirschner Wires - Polyurethane Foarri

Full Text

References

References
1 Anderson MA, Mann FA, Kinden DA, Wagner-Mann CC. 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. JAVMA 1996; 06: 883-7.
2 Anderson MA, Mann FA, Wagner-Mann C, Hahn AW, Jiang BL, Tomlinson JL. A Comparison of Nonthreaded, Enhanced Threaded, and Ellis Fixation Pins Used in Type I External Skeletal Fixators in Dogs. Vet Surg 1993; 22: 482-9.
3 Aron DN, Toombs JP, Hollingsworth SC. Primary Treatment of Severe Fractures by External Skeletal Fixation: Threaded Pins Compared with Smooth Pins. JAAHA 1986; 22: 659-70.
4 Bennett RA, Egger EL, Histand M, Ellis AB. Comparison of the Strength and Holding Power of 4 Pin Designs for Use with Halft Pin (Type I) External Skeletal Fixation. Vet Surg 1987; 16: 207-11.
5 Box GEP, Cox DR. An Analysis of Transformations. J Roay Stat Soc, Series B 1964; 26: 211-52.
6 Chapman JR, Harrington RM, Lee KM, Anderson PA, Tencer AF. Kowalski Factors Affecting the Pull-out Strength of Cancellous Bone Screws. J Biomech Eng 1996; 118: 391-8.
7 Clary EM, Roe SC. Enhancing External Skeletal Fixation Pin Performance: Consideration of the Pin-Bone Interface. Vet Comp Orthop Traumatol 1995; 08: 1-8.
8 Clary EM, Roe SC. In Vitro Biomechanical and Histological Assessment of Pilot Hole Diameter for Positive-Profile External Skeletal Fixation Pins in Canine Tibia. Vet Surg 1996; 25: 453-62.
9 Cook WT, Smith MM, Markel MD, Grant W. Influence of an Interdental Full Pin on Stability of an Acrylic External Fixator for Rostral Mandibular Fractures in Dogs. AJVR 2001; 62: 576-80.
10 Davis M, Schulz KS, Fawcett A, Slater MR, Roths JB. Flexural and Torsional Analysis of Five Acrylics for Use in External Skeletal Fixation. Vet Comp Orthop Traumatol 1998; 11: 53-8.
11 Degernes LA, Roe SC, Abrams CF. Holding Power of Different Pin Designs and Pin Insertion Methods in Avian Cortical Bone. Vet Surg 1998; 27: 301-6.
12 Sandman Dernell WS, Harari J. Blackketter et al. A Comparison of Acute Pull-out Strength Between Two-Way and One-Way Transfixation Pin Insertion for External Skeletal Fixation in Canine Bone. Vet Surg 1993; 22: 110-4.
13 Egger EL. Complications of External Skeletal Fixation: A Problem -Oriented Approach. Vet Clin North Am 1991; 21: 705-33.
14 Egger EL, Histand MB, Blass CE, Powers BE. Effect of Fixation Pin Insertion on the Bone-Pin Interface. Vet Surg 1986; 15: 246-52.
15 Field JR, Hearn TC, Arighi M. Investigation of Bioabsorbable Screw Usage for Longbone Fracture Repair in the Horse: Biomechanical Features. Vet Comp Orthop Traumatol 1993; 06: 42-6.
16 Halsey D, Fleming B, Pope MH, Krag M, Kristiansen T. External Fixation Pin Design. Clin Orthop Rel Res 1992; 278: 305-12.
17 Harari J. Complications of External Skeletal Fixation. Vet Clin North Am 1992; 22: 99-108.
18 Marti JM, Roe SC. Biomechanical Comparison of the Trocar Tip Point and the Hollow Ground Tip Point for Smooth External Skeletal Fixation Pins. Vet Surg 1998; 27: 423-8.
19 McDonald DE, Palmer RH, Hulse DA, Neigut JS, Hyman WA, Slater MR. Holding Power of Threaded External Skeletal Fixtaion Pins in the Near and Far Cortices of Cadaveric Canine Tibiae. Vet Surg 1994; 23: 488-93.
20 Okrasinski EB, Pardo AD, Graehler RA. Biomechanical Evaluation of Acrylic External Skeletal Fixation in Dogs and Cats. JAVMA 1991; 199: 1590-3.
21 Palmer RH, Hulse DA, Hyman WA, Palmer DR. Principles of Bone Healing and Biomechanics of External Skeletal Fixation. Vet Clin North Am 1992; 22: 45-68.
22 Roe SC, Keo T. Epoxy Putty for Free-Form External Skeletal Fixators. Vet Surg 1997; 26: 472-7.
23 Ross JT, Matthiesen DT. The Use of Multiple Pin and Methylmethacrylate External Skeletal Fixation for the Treatment of Orthopedic Injuries in the Dog and Cat. Vet Comp Orthop Traumatol 1993; 06: 115-21.
24 Shahar R. Evaluation of Stiffness and Stress of External Fixators with Curved Acrylic Connecting Bars. Vet Comp Orthop Traumatol 2000; 13: 65-72.
25 Shahar R. Relative Stiffness and Stress of Type I and Type II External Fixators: Acryilic Versus Stainless-Steel Connecting Bars A Theoretical Approach. Vet Surg 2000; 29: 59-69.
26 Thompson JD, Benjamin JB, Szivek JA. Pull-out Strengths of Cannulated and Noncannulated Cancellous Bone Screws. Clin Orth Rel Res 1997; 341: 241-9.
27 Tukey JW. The Problem of Multiple Comparisons. J Roay Stat Soc, Series B. 1953. Princeton University.;
28 Wilier RL, Egger EL, Histand MB. Comparison of Stainless Steel Versus Acrylic for the Connecting Bar of External Skeletal Fixators. JAAHA 1991; 27: 541-8.