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. 2021 Apr 27:8:637268.
doi: 10.3389/fsurg.2021.637268. eCollection 2021.

Temporal Changes in Reverse Torque of Locking-Head Screws Used in the Locking Plate in Segmental Tibial Defect in Goat Model

Remigiusz M Grzeskowiak  1 , Rebecca E Rifkin  1 , Elizabeth G Croy  1 , Richard C Steiner  1 , Reza Seddighi  1 , Pierre-Yves Mulon  1 , Henry S Adair  1 , David E Anderson  1
Affiliations

Temporal Changes in Reverse Torque of Locking-Head Screws Used in the Locking Plate in Segmental Tibial Defect in Goat Model

Remigiusz M Grzeskowiak et al. Front Surg. .

Abstract

The objective of this study was to evaluate changes in peak reverse torque (PRT) of the locking head screws that occur over time. A locking plate construct, consisting of an 8-hole locking plate and 8 locking screws, was used to stabilize a tibia segmental bone defect in a goat model. PRT was measured after periods of 3, 6, 9, and 12 months of ambulation. PRT for each screw was determined during plate removal. Statistical analysis revealed that after 6 months of loading, locking screws placed in position no. 4 had significantly less PRT as compared with screws placed in position no. 5 (p < 0.05). There were no statistically significant differences in PRT between groups as a factor of time (p > 0.05). Intracortical fractures occurred during the placement of 151 out of 664 screws (22.7%) and were significantly more common in the screw positions closest to the osteotomy (positions 4 and 5, p < 0.05). Periosteal and endosteal bone reactions and locking screw backout occurred significantly more often in the proximal bone segments (p < 0.05). Screw backout significantly, negatively influenced the PRT of the screws placed in positions no. 3, 4, and 5 (p < 0.05). The locking plate-screw constructs provided stable fixation of 2.5-cm segmental tibia defects in a goat animal model for up to 12 months.

Keywords: animal models; biomechanics; bone healing; fracture fixation; locking screws; orthopedics; segmental bone defect.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
The 2.5 cm osteotomy was stabilized with 8-hole, 4.5 mm thick locking plate and eight 4.0 mm locking-head screws, four in the proximal bone segment in positions from 1 to 4 and four in the distal bone segment in the positions from 5 to 8. The transcortical diaphyseal fractures are marked with the white circle and enlarged on the right side of the image.
See this image and copyright information in PMC

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