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. 2013 Dec 19;48(6):500-504.
doi: 10.1016/j.rboe.2013.12.006. eCollection 2013 Nov-Dec.

Dimensional analysis of total hip arthroplasty polyethylenes

Carlos Roberto Schwartsmann  1   2 , Leandro de Freitas Spinelli  2 , Leonardo Carbonera Boschin  2 , Ramiro Zilles Gonçalves  2 , Anthony Kerbes Yépez  2 , Telmo Roberto Strohaecker  3 , Ralf Wellis de Souza  3
Affiliations

Dimensional analysis of total hip arthroplasty polyethylenes

Carlos Roberto Schwartsmann et al. Rev Bras Ortop. .

Abstract
in English, Portuguese

Objective: This paper performs a dimensional analysis of different total hip arthroplasty polyethylenes, cemented and non-cemented, Brazilian made and imported.

Methods: It was considered acetabular components with 50 mm for the 28 mm femoral heads. Dimensional analysis was performed on a 3D coordinate Carl-Zeiss robotic device. Polyethylene thickness and its external measurements (maximum diameter and diameter for the femoral head) were measured.

Results: The minimum thickness of the polyethylene was guaranteed on all tested components. The thickness of cemented acetabular varied from 19.185 mm to 25.358 mm, while the thickness of the non-cemented acetabular varied from 12.451 mm to 19.232 mm. The thickness was 27.96% lower in non-cemented acetabular components. With respect to the polyethylene acetabular cavity that receives the femoral head, all internal diameters exhibit at least 28 mm. In relation to the maximum outer diameter of the polyethylene, only one cemented acetabular component reached 50 mm in diameter.

Conclusions: There are large differences in measurements between brands and models analyzed. Cementless acetabular components have the smaller thickness. The diameters of non-cemented acetabular were also lower than those cemented at the expense of their need to insert into the metal-back.

Objetivo: O presente estudo faz uma análise dimensional dos diferentes acetábulos cimentados e não cimentados, nacionais e importados, disponíveis no mercado nacional para artroplastia total do quadril.

Métodos: Foram considerados os acetábulos de 50 mm, destinados às cabeças femorais de 28 mm. As análises dimensionais foram feitas em um equipamento tridimensional robótico de medição por coordenadas. Avaliou-se a menor espessura do polietileno e suas medidas externas (diâmetro do espaço para a cabeça femoral e diâmetro máximo do acetábulo).

Resultados: A espessura mínima do polietileno foi garantida em todos os componentes testados. A espessura dos acetábulos cimentados variou de 19,185 mm a 25,358 mm, enquanto a espessura dos acetábulos não cimentados variou de 12,451 mm a 19,232 mm A espessura foi em média 27,96% menor nos acetábulos não cimentados. Em relação à cavidade acetabular do polietileno que recebe a cabeça femoral, todos os diâmetros internos apresentaram pelo menos 28 mm. Em relação ao diâmetro externo máximo do polietileno, apenas um acetábulo cimentado atingiu os 50 mm de diâmetro.

Conclusões: Observaram-se grandes diferenças nas medidas entre as marcas e os modelos analisados. Os acetábulos não cimentados têm uma espessura menor. Os diâmetros dos acetábulos não cimentados também foram menores do que os cimentados, à custa de sua necessidade de inserção no metal-back.

Keywords: Acetabulum; Arthroplasty, replacement, hip; Polyethylene.

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Figures

Fig. 1
Fig. 1
Carl Zeiss device used for making the measurements: (a) in general view and (b) focused.
See this image and copyright information in PMC

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