The Role of Pedicle Screw Surface on Insertion Torque and Pullout Strength

Fleury, Rodrigo Barra Caiado; Shimano, Antônio Carlos; Matos, Thiago Dantas; Teixeira, Kelsen de Oliveira; Romero, Valéria; Defino, Helton Luiz Aparecido

doi:10.1055/s-0040-1710072

Rodrigo Barra Caiado Fleury Address for correspondence Rodrigo Barra Caiado Fleury, MD, Faculdade de Medicina de Ribeirão Preto, Departamento de Cirurgia Ortopedia e Traumatologia, Universidade de São Paulo, Avenida Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, 14049900, Brazil (e-mail: caiadomed@hotmail.com).

Postgraduate Course, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil

https://orcid.org/0000-0001-7643-6466

Antônio Carlos Shimano

Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil

https://orcid.org/0000-0002-3119-2362

Thiago Dantas Matos

Postgraduate Course, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil

https://orcid.org/0000-0003-3853-502X

Kelsen de Oliveira Teixeira

Postgraduate Course, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil

https://orcid.org/0000-0003-4385-405X

Valéria Romero

Department of Internal Medicine, Faculty of Medical Sciences, Universidade Estadual de Campinas, Campinas, SP, Brazil

https://orcid.org/0000-0002-3278-5223

Helton Luiz Aparecido Defino

Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil

https://orcid.org/0000-0003-4274-0130

Address for correspondence Rodrigo Barra Caiado Fleury, MD, Faculdade de Medicina de Ribeirão Preto, Departamento de Cirurgia Ortopedia e Traumatologia, Universidade de São Paulo, Avenida Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, 14049900, Brazil (e-mail: caiadomed@hotmail.com).

Conflict of Interests

The authors have no conflict of interests to declare.

Authors' Declaration of Contribution

Each author contributed individually and significantly to the development of this article. Fleury R. B. C. (0000–0001–7643–6466)^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. : Substantial contributions to the conception and design of the work, acquisition and interpretation of data for the work and final approval of the version to be published; Shimano A. C.(0000–0002–3119–2362)^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. : contribution to data collection, analysis and final approval; Matos T. D. (0000–0003–3853–502X) *: contribution to data collection and analysis; Teixeira K. O. (0000–0002–8165–2427)^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. : contribution to data collection and analysis; Romero V (0000–0002–3278–5223)^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. : review for important intellectual content; Defino H. L. A. (0000–0003–4274–0130)^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. : Substantial contributions to the conception and design of the work, contributions to the analysis and interpretation of data for the work and final approval of the version to be published.

INSERTION TORQUE
GROUP	Screw Diameter	Pilot hole tapping	n	Mean	Standard Deviation	Minimum	Median	Maximum
Smooth surface (Pedicol)	4.8 mm	4,0 mm	5	0.16	0.03	0.11	0.16	0.20
	4.8 mm	Without tapping	5	0.32	0.04	0.27	0.32	0.37
	5.5 mm	4,0 mm	5	0.20	0.05	0.14	0.20	0.28
		5,0 mm	5	0.14	0.01	0.13	0.14	0.16
		Without tapping	5	0.23	0.05	0.15	0.24	0.26
	6.5 mm	4,0 mm	5	0.38	0.09	0.28	0.39	0.48
		5,0 mm	5	0.41	0.05	0.33	0.40	0.48
		6,0 mm	5	0.29	0.04	0.25	0.29	0.33
		Without tapping	5	0.39	0.03	0.37	0.37	0.44
Rough surface (SAFE)	4.8 mm	4,3 mm	5	0.30	0.04	0.27	0.29	0.36
	4.8 mm	Without tapping	5	0.30	0.05	0.24	0.28	0.37
	5.5 mm	4,3 mm	5	0.43	0.02	0.40	0.42	0.45
		5,0 mm	5	0.34	0.07	0.24	0.34	0.41
		Without tapping	5	0.35	0.12	0.15	0.37	0.47
	6.5 mm	4,3 mm	5	0.56	0.11	0.44	0.54	0.73
		5,0 mm	5	0.60	0.06	0.50	0.63	0.64
		6,0 mm	5	0.35	0.06	0.28	0.33	0.42
		Without tapping	5	0.62	0.02	0.59	0.63	0.65

PULLOUT STRENGTH
GROUP	Screw Diameter	Pilot hole tapping	n	Mean	Standard Deviation	Minimum	Median	Maximum
Smooth surface (Pedicol)	4.8 mm	4,0 mm	5	262.13	35.72	235.73	251.10	322.90
	4.8 mm	Without tapping	5	456.17	19.71	429.44	454.94	483.83
	5.5 mm	4,0 mm	5	525.47	35.16	489.89	522.25	575.42
		5,0 mm	5	384.39	22.19	362.13	382.59	420.26
		Without tapping	5	524.36	14.87	505.80	532.18	537.21
	6.5 mm	4,0 mm	5	685.39	32.05	642.60	678.09	729.08
		5,0 mm	5	653.99	60.10	591.74	648.58	742.48
		6,0 mm	5	451.65	45.41	402.72	445.83	513.00
		Without tapping	5	622.73	29.40	582.42	617.10	657.01
Rough surface (SAFE)	4.8 mm	4,3 mm	5	427.51	29.99	396.33	429.98	466.29
	4.8 mm	Without tapping	5	434.70	25.29	401.70	433.25	465.48
	5.5 mm	4,3 mm	5	486.46	13.09	468.88	490.63	498.72
		5,0 mm	5	476.81	46.80	408.77	474.54	534.22
		Without tapping	5	536.35	48.56	468.67	538.09	602.41
	6.5 mm	4,3 mm	5	648.15	38.56	600.92	671.02	679.38
		5,0 mm	5	625.84	19.62	598.54	626.01	653.88
		6,0 mm	5	518.33	49.86	439.37	528.98	576.58
		Without tapping	5	599.44	17.31	581.34	600.71	624.92

Screw Diameter	Pilot hole tapping	Type of surface	Median	95% CI	p-value
4,8 mm	Without tapping	Smooth (Pedicol)	0,323	-0,103; 0,130	0,527
4,8 mm	Without tapping	Rough (SAFE)	0,284	-0,103; 0,130	0,527
4,8 mm	4,0 mm Pedicol	Smooth (Pedicol)	0,160	-0,244; -0,071	*0,002
4,8 mm	4,3 mm (SAFE)	Rough (SAFE)	0,289	-0,244; -0,071	*0,002
5,5 mm	Without tapping	Smooth (Pedicol)	0,240	-0,262; 0,103	0,099
5,5 mm	Without tapping	Rough (SAFE)	0,370	-0,262; 0,103	0,099
5,5 mm	4,0 mm Pedicol	Smooth (Pedicol)	0,204	-0,309; -0,116	*0,002
5,5 mm	4,3 mm (SAFE)	Rough (SAFE)	0,422	-0,309; -0,116	*0,002
5,5 mm	5,0 mm Pedicol	Smooth (Pedicol)	0,136	-0,278; -0,085	*0,002
5,5 mm	5,0 mm (SAFE)	Rough (SAFE)	0,338	-0,278; -0,085	*0,002
6,5 mm	Without tapping	Smooth (Pedicol)	0,372	-0,287; -0,151	*0,002
6,5 mm	Without tapping	Rough (SAFE)	0,626	-0,287; -0,151	*0,002
6,5 mm	4,0 mm Pedicol	Smooth (Pedicol)	0,392	-0,444; 0,045	0,058
6,5 mm	4,3 mm(SAFE)	Rough (SAFE)	0,536	-0,444; 0,045	0,058
6,5 mm	5,0 mm Pedicol	Smooth (Pedicol)	0,403	-0,305; -0,018	*0,002
6,5 mm	5,0 mm (SAFE)	Rough (SAFE)	0,626	-0,305; -0,018	*0,002
6,5 mm	6,0 mm Pedicol	Smooth (Pedicol)	0,290	-0,173; 0,054	0,058
6,5 mm	6,0 mm (SAFE)	Rough (SAFE)	0,327	-0,173; 0,054	0,058

Screw Diameter	Pilot hole tapping	Type of surface	Median	95% CI	p-Value
4,8 mm	Without tapping	Smooth (Pedicol)	454,90	-36,0; 82,1	0,527
4,8 mm	Without tapping	Rough (SAFE)	433,30	-36,0; 82,1	0,527
4,8 mm	4,0 mm (Pedicol)	Smooth (Pedicol)	251,0	-231,0; -73,0	*0,002
4,8 mm	4,3 mm (SAFE)	Rough (SAFE)	430,0	-231,0; -73,0	*0,002
5,5 mm	Without tapping	Smooth (Pedicol)	532,0	-97,0; 69,0	0,527
5,5 mm	Without tapping	Rough (SAFE)	538,0	-97,0; 69,0	0,527
5,5 mm	4,5 mm (Pedicol)	Smooth (Pedicol)	522,0	-9,0; 107,0	0,527
5,5 mm	4,5 mm (SAFE)	Rough (SAFE)	491,0	-9,0; 107,0	0,527
5,5 mm	5,0 mm (Pedicol)	Smooth (Pedicol)	383,0	-172,0; 11,0	0,058
5,5 mm	5,0 mm (SAFE)	Rough (SAFE)	475,0	-172,0; 11,0	0,058
6,5 mm	Without tapping	Smooth (Pedicol)	617,1	-42,5; 75,7	0,058
6,5 mm	Without tapping	Rough (SAFE)	600,7	-42,5; 75,7	0,058
6,5 mm	4,5 mm (Pedicol)	Smooth (Pedicol)	678,0	-37,0; 128,0	0,527
6,5 mm	4,5 mm (SAFE)	Rough (SAFE)	671,0	-37,0; 128,0	0,527
6,5 mm	5,0 mm (Pedicol)	Smooth (Pedicol)	649,0	-62,0; 144,0	0,527
6,5 mm	5,0 mm (SAFE)	Rough (SAFE)	626,0	-62,0; 144,0	0,527
6,5 mm	6,0 mm (Pedicol)	Smooth (Pedicol)	446,0	-174,0; 74,0	0,058
6,5 mm	6,0 mm (SAFE)	Rough (SAFE)	529,0	-174,0; 74,0	0,058

[1] Address for correspondence Rodrigo Barra Caiado Fleury, MD, Faculdade de Medicina de Ribeirão Preto, Departamento de Cirurgia Ortopedia e Traumatologia, Universidade de São Paulo, Avenida Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, 14049900, Brazil (e-mail: caiadomed@hotmail.com).

Brasil

Brasil

The Role of Pedicle Screw Surface on Insertion Torque and Pullout Strength^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.

Abstract

Objective

Methods

Results

Conclusion

Brasil

Brasil

The Role of Pedicle Screw Surface on Insertion Torque and Pullout Strength* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.

Abstract

Objective

Methods

Results

Conclusion

The Role of Pedicle Screw Surface on Insertion Torque and Pullout Strength^* * Work developed in the Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.