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Updated: Dec 18, 2025
An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
Published on: May 31, 2017
A cadaveric comparison of two methods for isolated talonavicular arthrodesis: Two-screws versus plate with integrated
Danielle M Cristino1, Elaine C Schmidt1, Sreenivasulu Metikala2
1Biedermann Lab for Orthopaedic Research, University of Pennsylvania, 3737 Market Street, 10th Floor Suite 1050, Philadelphia, PA 19104, United States.
Background:
This study compared stiffness between two constructs for talonavicular arthrodesis: a dorsomedial plating system and two partially threaded cannulated cancellous screws. We hypothesized that the plate would exhibit greater stiffness and resistance to deformation during cyclic loading.
Methods:
The constructs were implanted in eight matched pairs of cadaveric feet and subjected to axial torsion, cantilever bending in two directions, and cyclic loading to failure.
Results:
The two-screw constructs were significantly stiffer in plantar-dorsal bending (p = .025) and trended towards a higher number of cycles before failure than the plate group (p = .087). No significant differences were observed in internal torsion (p = .620), external torsion (p = .165), or medial-lateral bending (p = .686).
Conclusions:
This study provided the first biomechanical assessment of a plating system with an integrated compression screw, which was significantly less stiff than a two-screw construct when loaded from plantar to dorsal.
