Abstract
OBJETIVO: Confirmar por análise fluoroscópica a movimentação rotacional do insert de polietileno em artroplastias totais de joelho (ATJ) de plataforma rotatória, após um tempo pós operatório mínimo de seis meses, foram estudados 15 joelhos, submetidos a ATJ de plataforma rotatória, com a prótese NEW WAVE, da LEPINE. MÉTODOS: Foi utilizado para a avaliação da rotação do insert de polietileno através de um aparelho de fluoroscopia numa visão anteroposterior do joelho com 90º de flexão. Caso a imagem do marcador radiopaco do polietileno permanecesse inalterada, ou seja, acompanhasse o fêmur, era considerado então que a rotação estaria ocorrendo entre o insert e o componente tibial. RESULTADOS: Dos 15 joelhos analisados, 14 apresentaram movimentação demonstrável do insert de polietileno, totalizando 93,3%. Para que a ATJ de plataforma rotatória mantenha seu potencial é necessário que a movimentação rotacional do insert de polietileno se mantenha com o tempo. CONCLUSÃO: Com estudo dessa amostra concluiu-se que a rotação se mantém de forma consistente (93%). Sugerindo que a ATJ de plataforma rotatória tem efetivamente o potencial de apresentar menor desgaste do polietileno pela maior congruência articular, em relação à ATJ de apoio fixo, além da vantagem de auto-alinhamento do mecanismo extensor.
Highlights
Total knee arthroplasty (TKA) is a traditional procedure, having considerably improved the quality of life of a large quantity of patients, with a wide range of pathologies.[1]
The maintenance of the rotation property of polyethylene on the tibia over the years is relevant for the maintenance of the mechanical properties, and a necessary premise when discussing the functioning of mobile platform TKA.[1,2]
The only knee in which we verified the absence of mobility between polyethylene and the tibial component of the arthroplasty, belonged to a patient that had just one of his knees operated. (Chart 1)
Summary
Total knee arthroplasty (TKA) is a traditional procedure, having considerably improved the quality of life of a large quantity of patients, with a wide range of pathologies.[1]. The maintenance of the rotation property of polyethylene on the tibia over the years is relevant for the maintenance of the mechanical properties, and a necessary premise when discussing the functioning of mobile platform TKA.[1,2] it is discussed whether the movement between the polyethylene and the tibial base continues or disappears over the years.[1,2,3] Loss of mobility among components is a possible occurrence with mobile TKA,[2,3], which might present loss of the biomechanical advantages of this platform and even impairment of the mobile platform in relation to the fixed platform as a consequence.[1,2,3] In this regard, as moving platform prostheses are developed and designed observing the principle of rotation between the polyethylene and the tibial base.[1,2,3] in vivo studies analyzing preservation of this property are extremely pertinent. It is necessary to observe the rotational movement of the polyethylene insert, with the help of fluoroscopy, in patients undergoing TKA over 6 months into the postoperative period
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
