Comparison of a 2.7-mm and 3.5-mm locking compression plate for ulnar fractures: a biomechanical evaluation.

Autor:	Wahbeh JM; The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Luskin Orthopaedic Institute for Children in Alliance with UCLA, Los Angeles, CA.; University of California, Los Angeles, Department of Bioengineering, Los Angeles, CA., Kelley BV; University of California, Los Angeles, Department of Orthopaedic Surgery, Los Angeles, CA., Shokoohi C; University of California, Los Angeles, Department of Bioengineering, Los Angeles, CA., Park SH; The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Luskin Orthopaedic Institute for Children in Alliance with UCLA, Los Angeles, CA.; University of California, Los Angeles, Department of Orthopaedic Surgery, Los Angeles, CA., Devana SK; University of California, Los Angeles, Department of Orthopaedic Surgery, Los Angeles, CA., Ebramzadeh E; The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Luskin Orthopaedic Institute for Children in Alliance with UCLA, Los Angeles, CA.; University of California, Los Angeles, Department of Orthopaedic Surgery, Los Angeles, CA., Sangiorio SN; The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Luskin Orthopaedic Institute for Children in Alliance with UCLA, Los Angeles, CA.; University of California, Los Angeles, Department of Bioengineering, Los Angeles, CA.; University of California, Los Angeles, Department of Orthopaedic Surgery, Los Angeles, CA., Jeffcoat DM; University of California, Los Angeles, Department of Orthopaedic Surgery, Los Angeles, CA.
Jazyk:	angličtina
Zdroj:	OTA international : the open access journal of orthopaedic trauma [OTA Int] 2023 Jul 25; Vol. 6 (3), pp. e278. Date of Electronic Publication: 2023 Jul 25 (Print Publication: 2023).
DOI:	10.1097/OI9.0000000000000278
Abstrakt:	Objectives: Implant prominence after ulnar fracture fixation may be mitigated by the use of lower profile plates. The biomechanical strength and stability of 2.7-mm and 3.5-mm locking compression plates for fixation were compared. Methods: Two fracture conditions, transverse (N = 10) and oblique (N = 10), were evaluated in an in vitro study. Half of the specimens for each condition were fixed with 2.7-mm plates and the other half with 3.5-mm plates, all fixed with conventional dynamic compression mechanisms. Specimens were loaded under ±2 Nm of cyclic axial torsion, then under 10 Nm of cyclic cantilever bending, and bending to failure. Interfragmentary motion and strain were analyzed to determine construct stability as a function of fracture pattern and plate size. Results: Interfragmentary motion was significantly larger in all constructs fixed with 2.7-mm plates, compared with 3.5-mm plates ( P < 0.01). The 2.7-mm constructs with transverse fractures had the greatest motion, ranging between 5° and 10° under axial rotation and 5.0-6.0 mm under bending. Motions were the lowest for 3.5-mm constructs with oblique fractures, ranging between 3.2 and 4.2 mm under bending and 2°-3.5° for axial rotation. For oblique fractures, the bending moment at ultimate failure was 31.4 ± 3.6 Nm for the 2.7-mm constructs and 10.0 ± 1.9 Nm for 3.5-mm constructs ( P < 0.01). Similarly, for transverse fractures, the bending moment was 17.9 ± 4.0 Nm for the 2.7-mm constructs and 9.7 ± 1.3 Nm for the 3.5-mm constructs ( P < 0.01). Conclusions: Although 3.5-mm plates were more effective at reducing fracture motion, they were consistently associated with refracture at the distal-most screw hole under load to failure. By contrast, 2.7-mm plates plastically deformed despite excessive loads, potentially avoiding a subsequent fracture. Level of Evidence: Level V. Competing Interests: The authors report no conflict of interest. The authors have no conflicts of interest to disclose. (Copyright © 2023 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of the Orthopaedic Trauma Association.)
Databáze:	MEDLINE
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