Comparative Biomechanical Study of Crosslinked Polyethylene Wear with 36-mm Ceramic Femoral Heads and with 32-mm Metal Femoral Heads

Falotico, Guilherme Guadagnini; Takata, Pedro; Jacob, Leonardo Salani; Roesler, Carlos Rodrigo de Mello; Romero, Valéria; Takata, Edmilson Takehiro

doi:10.1055/s-0040-1708518

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Sumário

Original Article, Hip • Rev. bras. ortop. 55 (5) • Sep-Oct 2020 • https://doi.org/10.1055/s-0040-1708518 copy

Comparative Biomechanical Study of Crosslinked Polyethylene Wear with 36-mm Ceramic Femoral Heads and with 32-mm Metal Femoral Heads

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Objective

This study aims to compare the in vitro wear rate of crosslinked, high molecular weight polyethylene coupled to 36-mm diameter ceramic heads and 32-mm diameter metal heads.

Methods

Ceramic-on-polyethylene (36 mm) and metal-on-polyethylene (32 mm) tribological pairs were submitted to biomechanical tests in a simulator to determine the wear rate after 15 × 10⁶ cycles.

Results

A statistically significant difference (p = 0.0005) was detected when comparing the wear rate of assemblies with metallic heads (average wear: 14.12 mg/MC) and ceramic heads (average wear: 7.46 mg/MC).

Conclusion

The present study demonstrated the lower wear rate in prosthetic assemblies using 36-mm crosslinked ceramic-on-polyethylene tribological pairs compared to 32-mm crosslinked metal-on-polyethylene assemblies. This finding demonstrates the effectiveness of ceramic-on-polyethylene tribological pairs, even with large diameter heads.

Keywords
hip arthroplasty; ceramic; polyethylene; hip; prosthesis design

Identification				Assay code
Manufacturer	Product Identification	Code / Register	Lot number	Assay code
Víncula	PHENOM Poly acetabular insert post. roof 36 × 58/60 mm crosslinked	LP .13.24.36060	12097S	CP47.2018ED-01
	PHENOM Poly PS acetabulum 60 mm diameter	04.01.34.00060	04859R
	Interchangeable femoral head 36 mm standard neck delta ceramics	04.04.10.36002	3150387
	Low-profile acetabular screw Ti Ø 6.5 × 15 mm	04.43.19.65015	11808S
Víncula	PHENOM Poly acetabular insert post. roof 36 × 58/60 mm crosslinked	LP .13.24.36060	12097S	CP47.2018ED-02
	PHENOM Poly PS acetabulum 60 mm diameter	04.01.34.00060	04859R
	Interchangeable femoral head 36 mm standard neck delta ceramics	04.04.10.36002	3150389
	Low-profile acetabular screw Ti Ø 6.5 × 15 mm	04.43.19.65015	11808S
Víncula	PHENOM poly acetabular insert post. roof 36 × 58/60 mm crosslinked	LP .13.24.36060	12097S	CP47.2018ED-03
	PHENOM Poly PS acetabulum 60 mm diameter	04.01.34.00060	04859R
	Interchangeable femoral head 36 mm standard neck delta ceramics	04.04.10.36002	3150390
	Low-profile acetabular screw Ti Ø 6.5 × 15 mm	04.43.19.65015	11808S
Víncula	PHENOM Poly acetabular insert post. roof 36 × 58/60 mm crosslinked	LP .13.24.36060	12097S	EC47.2018ED-01
	PHENOM Poly PS acetabulum 60 mm diameter	04.01.34.00060	04859R
	Interchangeable femoral head 36 mm standard neck delta ceramics

Identification				Assay code
Manufacturer	Product Identification	Code / Register	Lot number	Assay code
Víncula	PHENOM Poly acetabular insert post. roof 32 × 50/52 mm crosslinked	LP .13.24.32052	11868S	CP46.2018ED-01
	PHENOM Poly PS acetabulum 52 mm diameter	04.01.34.00052	04450R
	Interchangeable femoral head 32-mm standard neck	04.04.07.32002	05151R
	Low-profile acetabular screw Ti Ø 6.5 × 15 mm	04.43.19.65015	11808S
Víncula	PHENOM Poly acetabular insert post. roof 32 × 50/52 mm crosslinked	LP .13.24.32052	11868S	CP46.2018ED-02
	PHENOM Poly PS acetabulum 52-mm diameter	04.01.34.00052	04450R
	Interchangeable femoral head 32 mm standard neck	04.04.07.32002	05151R
	Low-profile acetabular screw Ti Ø 6.5 × 15 mm	04.43.19.65015	11808S
Víncula	PHENOM Poly acetabular insert post. roof 32 × 50/52 mm crosslinked	LP .13.24.32052	11868S	CP46.2018ED-03
	PHENOM Poly PS acetabulum 52 mm diameter	04.01.34.00052	04450R
	Interchangeable femoral head 32 mm standard neck	04.04.07.32002	05151R
	Low-profile acetabular screw Ti Ø 6.5 × 15 mm	04.43.19.65015	11808S
Víncula	PHENOM Poly acetabular insert post. roof 32 × 50/52 mm crosslinked	LP .13.24.32052	12276S	EC46.2018ED-01
	PHENOM Poly PS acetabulum 52-mm diameter	04.01.34.00052	00544P
	Interchangeable femoral head 32-mm standard neck	04.04.07.32002	05151R

	NUMBER OF CYCLES (x 10⁶) [mg]
	0.5	1	2	3	4	5
CP.462018ED-01	-2.87	-2.05	-20.51	-31.67	-40.74	-56.45
CP.462018ED-02	-2.89	-4.06	-20.70	-30.42	-40.11	-57.47
CP.462018ED-03	-1.25	-3.07	-21.03	-31.93	-44.14	-65.11
MEAN	-2.34	-3.06	-20.75	-31.34	-41.66	-59.68
STANDARD DEVIATION	0.94	1.01	0.26	0.81	2.17	4.73

	NUMBER OF CYCLES (x 10⁶) [mg]
	0.5	1	2	3	4	5
CP47.2018ED-01	2.19	4.70	-4.35	-10.57	-13.72	-19.05
CP47.2018ED-02	-0.32	2.99	-3.19	-11.80	-13.54	-21.44
CP47.2018ED-03	-0.50	1.51	-6.46	-11.40	-16.75	-26.70
MEAN	0.45	3.07	-4.66	-11.26	-14.67	-22.40
STANDARD DEVIATION	1.51	1.60	1.66	0.63	1.80	3.91

	NUMBER OF CYCLES (x 10⁶) [mg]
	0.5	1	2	3	4	5
EC46.2018ED-01	1.10	3.13	4.94	5.93	6.97	7.89
EC46.2018ED-02	1.01	2.77	3.63	4.78	6.19	6.99
MEAN	1.05	2.95	4.28	5.35	6.58	7.44
STANDARD DEVIATION	0.07	0.26	0.93	0.81	0.55	0.64

	NUMBER OF CYCLES (x 10⁶) [mg]
	0.5	1	2	3	4	5
EC46.2018ED-01	1.86	3.11	5.08	7.58	8.83	10.72
EC46.2018ED-02	2.08	3.63	5.74	8.32	9.56	11.68
MEAN	1.97	3.37	5.41	7.95	9.20	11.20
STANDARD DEVIATION	0.16	0.37	0.47	0.53	0.52	0.68

	NUMBER OF CYCLES (x 10⁶) [mg]
	0.5	1	2	3	4	5
CP46.2018ED-01	3.92	5.00	24.80	37.02	47.32	63.89
CP46.2018ED-02	3.94	7.01	24.99	35.77	46.69	64.92
CP46.2018ED-03	2.31	6.02	25.31	37.29	50.72	72.55
MEAN	3.39	6.01	25.03	36.69	48.24	67.12
STANDARD DEVIATION	0.94	1.01	0.26	0.81	2.17	4.73

	0.5	1	2	3	4	5
CP47.2018ED-01	-0.22	-1.33	9.76	18.52	22.92	30.25
CP47.2018ED-02	2.29	0.38	8.60	19.75	22.74	32.64
CP47.2018ED-03	2.48	1.86	11.87	19.35	25.95	37.90
MEAN	1.52	0.30	10.07	19.20	23.87	33.60
STANDARD DEVIATION	1.51	1.60	1.66	0.63	1.80	3.91

	NUMBER OF CYCLES (x 10⁶) [mg]
	WEAR RATE (mg/Mc)	Determination coefficient (R²)
CP46.2018ED-01	13.57	0.989
CP46.2018ED-02	13.42	0.991
CP46.2018ED-03	15.36	0.990
MEAN	14.12
STANDARD DEVIATION	1.08

	WEAR RATE (mg/Mc)	Determination coefficient (R²)
CP46.2018ED-01	7.24	0.977
CP46.2018ED-02	7.16	0.966
CP46.2018ED-03	7.98	0.981
MEAN	7.46
STANDARD DEVIATION	0.45

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E-mail: rbo@sbot.org.br

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[1] Address for correspondence Guilherme Guadagnini Falótico, MsC, Orthopedics and Traumatology, Universidade Federal de São Paulo, Rua Napoleão de Barros, 715, 1° andar, Vila Clementino, São Paulo, Brazil (e-mail: ggfalotico@yahoo.com.br).