Comparison of Locked Plates and Blade Plates for Varus Osteotomy of the Proximal Femur by the Finite Element Method

Ribeiro Filho, Wilisson; Wolf, Eduardo Henrique Silva; Santili, Claudio; Akari, Miguel; Freitas, Vanessa Guimarães de; Doudement, Leonel Vieira

doi:10.1055/s-0043-1775889

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Original Article • Rev. bras. ortop. 59 (1) • Jan-Feb 2024 • https://doi.org/10.1055/s-0043-1775889 copy

Comparison of Locked Plates and Blade Plates for Varus Osteotomy of the Proximal Femur by the Finite Element Method

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Objective:

The present study compared the difference in load and pressure distribution behavior of the blade plate and locked plate for varus osteotomy of the proximal femur per the finite element method.

Methods:

Modeling was performed by scanning a medium-sized left femur with medial valgus deformity made of polyurethane.

Results:

The stiffness of the locked plate is higher compared with that of the blade plate. However, this difference was not significant. In addition, the locked plate has proximal locking screws to ensure that the bending moments on the screws are smaller during loading.

Conclusion:

In summary, both plates are well-established and effective. However, the study using the finite element method plays a fundamental role in understanding the load and pressure distribution of the implant. Moreover, it opens up new possibilities for further studies, including surgical proposals and customized implant materials.

Keywords
orthopedics; traumatology; femur; bone plates

Materials	Elastic modulus (E) [MPa]	Poisson ratio	Yield stress at 10⁶6 Nag P, Chanda S. Biomechanical design prognosis of two extramedullary fixation devices for subtrochanteric femur fracture: a finite element study. Med Biol Eng Comput 2021;59(02):271–285 cycles [MPa]
Cortical bone	8,700	0.33	200
Cancellous bone	500	0.30	125
Titanium alloy	110,000	0.34	540

Variable	Group	Number of nodes (mesh)	Maximum value	Minimum value	Applied force [N]
Total displacement [mm]	Locked plate	473,114	5.6797	0	450
Total displacement [mm]	Blade plate	325,578	6.1151	0
Plate and screw stress [MPa]	Locked plate	473,114	492.1	73.58
Plate and screw stress [MPa]	Blade plate	325,578	510.12	93.222
Bone stress [MPa]	Locked plate	473,114	245.86	40.469
Bone stress [MPa]	Blade plate	325,578	339.41	66.558

Variable	Group	Number of nodes (mesh)	Maximum value	Minimum value	Applied force [N]
Total displacement [mm]	Locked plate	473,114	6.4123	0	500
Total displacement [mm]	Blade plate	325,578	6.9125	0
Plate and screw stress [MPa]	Locked plate	473,114	552.04	82.515
Plate and screw stress [MPa]	Blade plate	325,578	580.26	103.87
Bone stress [MPa]	Locked plate	473,114	270.61	45.442
Bone stress [MPa]	Blade plate	325,578	365.99	73.925

Variable	Group	Number of nodes (mesh)	Maximum value	Minimum value	Applied force [N]
Total displacement [mm]	Locked plate	473,114	7.1602	0	550
Total displacement [mm]	Blade plate	325,578	7.7405	0
Plate and screw stress [MPa]	Locked plate	473,114	628.5	91.55
Plate and screw stress [MPa]	Blade plate	325,578	647.06	114.58
Bone stress [MPa]	Locked plate	473,114	314.46	50.454
Bone stress [MPa]	Blade plate	325,578	405.72	81.292

Variable	Group	Number of nodes (mesh)	Maximum value	Minimum value	Applied force [N]
Total displacement [mm]	Locked plate	473,114	7.942	0	600
Total displacement [mm]	Blade plate	325,578	8.6027	0
Plate and screw stress [MPa]	Locked plate	473,114	657.72	100.69
Plate and screw stress [MPa]	Blade plate	325,578	716.19	125.35
Bone stress [MPa]	Locked plate	473,114	345.65	55.504
Bone stress [MPa]	Blade plate	325,578	445.55	88.664

Applied force [N]	Group	Number of cycles
450	Locked plate	> 1,000,000
450	Blade plate	> 1,000,000
500	Locked plate	617,680
500	Blade plate	207,710
550	Locked plate	49,944
550	Blade plate	32,371
600	Locked plate	25,362
600	Blade plate	5,271

Sociedade Brasileira de Ortopedia e Traumatologia Al. Lorena, 427 14º andar, 01424-000 São Paulo - SP - Brasil, Tel.: 55 11 2137-5400 - São Paulo - SP - Brazil
E-mail: rbo@sbot.org.br

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[1] Address for correspondence Wilisson Ribeiro Filho, Departamento de Ortopedia e Traumatologia da Pontifícia Universidade Católica de Campinas (SP) – Grupo de Ortopedia e Traumatologia Pediátrica, Avenida John Boyd Dunlop, s/n°, Jardim Ipausssurama – 13060-904–Campinas, SP (e-mail: wilissonribeiro@uol.com.br).