In Vitro Evaluation of the Effect of Fracture Configuration on the Mechanical Properties of Standard and Novel Interlocking Nail Systems in Bending

Abstract

Use of standard ILNs may be optimal in diaphyseal fractures where circumferential nail/cortical contact could augment repair stability. Conversely, the angle-stable ILNn may represent a reliable fracture stabilization method for diaphyseal fractures as well as fractures involving the metaphyseal regions.

Effect of Intramedullary Rod Diameter on a String of Pearls Plate‐Rod Construct in Mediolateral Bending: An In Vitro Mechanical Study

“…However, the use of synthetic materials reduces construct variability and therefore the number of samples required to reach significance. The properties of the 30% glass filled structural nylon utilized in this study are comparable to those of natural bone and we have extensive experience with this material and model . The evaluation of a single loading condition does not replicate in vivo combinations of torsion, bending, and compression.…”

“…The bending stresses that canine long bones experience during daily exercise are, to the authors' knowledge, unknown. The bending moment of 3.5 Nm used in this study is identical to that of previous studies using the same testing setup . Furthermore, our interpretation of the results of the current study are only applicable to the SOP plate.…”

“…Sample size was determined based on similar experiments using this model and testing protocol performed in our laboratory . Shapiro–Wilk tests were used to verify normal distribution of all data before statistical comparisons.…”

“…12 All plates were affixed to a synthetic gap fracture model (Olympia Tool, St. Johns, MI) developed in our laboratory. [12][13][14][15] This model simulates a mid-diaphyseal comminuted fracture of a canine tibia and consists of 2 symmetrical halves made of 30% glass-filled structural nylon (Part No. P0304909, Alro Plastics, Jackson, MI).…”

“…All constructs were secured to a dedicated bending apparatus as previously described. 12,15 The bending apparatus features loading cups instrumented with rotary encoders (Renco Encoders, Goleta, CA) and was coupled to a servohydraulic testing machine (Instron Model 1331, Instron Corp., Canton, MA) via a 2,225 N load cell (Model 1010AF-500, Interface Manufacturing Inc., Scottsdale, AZ). Constructs were non- Figure 2 A) Custom-designed 3.5 mm SOP bending press with an adjustable bending set-point (blue circle) used to guarantee accurate and consistent plate contouring.…”