Evaluation of Polyethylene Wear in a Brazilian Ultracongruent Knee Prosthesis with a Rotating Platform

Pécora, José Ricardo; Romero, Valéria

doi:10.1055/s-0040-1712491

Acessibilidade / Reportar erro

Brasil

Revista Brasileira de Ortopedia

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Original Articles, Knee • Rev. bras. ortop. 56 (1) • Jan-Feb 2021 • https://doi.org/10.1055/s-0040-1712491 copy

Evaluation of Polyethylene Wear in a Brazilian Ultracongruent Knee Prosthesis with a Rotating Platform^* * Work developed at the Knee Group, Department of Orthopedics and Traumatology, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo (HCFMUSP), São Paulo, SP, Brazil, and at Faculdade de Medicina, Universidade de Campinas, Campinas, SP, Brazil.

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Objective

To evaluate the wear of polyethylene in a Brazilian ultracongruent knee prosthesis with a rotating platform (Rotaflex, Víncula, Rio Claro, SP, Brasil).

Methods

We used the test method with the loading and preparation parameters mentioned in the standards regulation ISO 14243-1:2009, and the measurement methods mentioned in the standards regulation ISO 14243-2:2009, for the evaluation of the wear behavior of a Brazilian prosthesis with a rotating platform. The equipment used for the wear test was the ISO 14243–1 gait simulator (EndoLab, Riedering, Germany).

Results

After 10 million cycles, the evaluation of the polyethylene wear showed a regular appearance of surface wear at a mean rate of 2.56 mg per million cycles.

Conclusion

The wear of the polyethylene of the evaluated prosthesis was minimal after the tests performed and with safety limits higher than those recommended by biomechanical engineering.

Keywords
arthroplasty, replacement, knee; knee prosthesis; prosthesis design; prosthesis failure

Parameter	Values according to ISO 14243-1
Flexion/Extension	0º to 58º
Axial force	168 N to 2,600 N
Anteroposterior force	-265 N to 110 N
Torque	-1 Nm to 6 Nm
Frequency	1 Hz
Test fluid	Calf serum
Movement restriction - anteroposterior^* * The system's anteroposterior movement restriction is 0 when the total knee joint is equal to or close to 2.5 mm in any direction from the reference position. (contrary to the positive anteroposterior movement)	9.3 N/mm
Movement restriction - anteroposterior^* * The system's anteroposterior movement restriction is 0 when the total knee joint is equal to or close to 2.5 mm in any direction from the reference position. (contrary to the negative anteroposterior movement)	44 N/mm
Restriction of tibial rotation^ The tibial rotation restriction of the system is 0 when the total knee joint is equal to or close to +/- 6º in any direction from the reference point.	0.36 Nm/º

Coupling	1.1		1.2		1.3
Coupling	Mass		Mass		Mass
Cycles (million)	X-UHMWPE 1.1 insert (g)	X-UHMWPE 1.1 insert (mg)	X-UHMWPE 1.2 insert (g)	X-UHMWPE 1.2 insert (mg)	X-UHMWPE 1.3 insert (g)	X-UHMWPE 1.3 insert (mg)
0.0	44.71242	0.00	44.48231	0.00	44.66329	0.00
0.5	44.70981	3.91	44.48121	2.41	44.65973	4.86
1.0	44.71073	4.24	44.48138	3.48	44.66000	5.84
2.0	44.71047	6.47	44.48102	5.81	44.65979	8.01
3.0	44.71210	6.71	44.48202	6.69	44.66085	8.83
4.0	44.71149	9.18	44.47986	10.70	44.65949	12.06
5.0	44.71378	9.30	44.48183	11.14	44.66343	10.52
6.0	44.71097	14.74	44.47747	18.13	44.65948	17.09
7.0	44.71004	15.47	44.47531	20.08	44.65842	17.95
7.5	44.71357	17.77	44.47810	23.13	44.66167	20.54
8.0	44.70607	22.38	44.47417	24.17	44.65625	23.06
9.0	44.70556	24.50	44.47504	24.90	44.65551	25.40
10.0	44.70660	25.23	44.47497	26.75	44.65645	26.24

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

Acompanhe os números deste periódico no seu leitor de RSS

[1] Address for correspondence Valéria Romero, PhD, Faculdade de Medicina, Universidade de Campinas, Rua Sérgio Buarque de Holanda, Cidade Universitária, Campinas, SP, 13083859, Brazil (e-mail: emaildavaleria@gmail.com).