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. 2019 Jul;54(4):453-458.
doi: 10.1055/s-0039-1688755. Epub 2019 Aug 20.

Results of Medium-Term Survival of the Non-Cemented Logical Femoral Stem

Cristiano Valter Diesel  1   2   3 , Tiango Aguiar Ribeiro  1   4   5 , Carlos Alberto de Souza Macedo  2   3 , Carlos Roberto Galia  1   2   3
Affiliations

Results of Medium-Term Survival of the Non-Cemented Logical Femoral Stem

Cristiano Valter Diesel et al. Rev Bras Ortop (Sao Paulo). 2019 Jul.

Abstract

Objective The main objective of the present study was to evaluate the clinical and radiographic results of the Logical (Baumer, Mogi Mirim, SP, Brasil) cementless femoral stem in primary total hip arthroplasties (THAs). Methods A retrospective cohort study of 632 patients submitted to primary THA with the Logical cementless femoral stem. The study period was between January 2004 and January 2015. The outcome defined to evaluate the survival of the stem was the clinical and radiographic indication of the revision hip arthroplasty or the actual revision of the femoral stem for any cause. Results Kaplan-Meier survival curves were estimated at > 95%, with a follow-up ranging from 2 to 13 years. There was a low incidence of transoperative periprosthetic fractures (0.02%). No axial migration or cortical bone atrophy was observed in the radiographic sample evaluated. Conclusions In the intermediate follow-up, there was excellent survival of the Logical cementless femoral stem. Although long-term studies are still awaited, this implant appears to be safe and promising to be used for primary THAs.

Keywords: arthroplasty, replacement, hip; bone cements; follow-up studies; hip joint.

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Conflict of interest statement

Declaração de Conflito de Interesses Um dos autores, Dr. Macedo C. A. S., declara haver conflito de interesses, visto ser o responsável pelo desenvolvimento da haste femoral Logical e ter cedido a tecnologia à empresa Baumer, Mogi Mirim, SP, Brasil.

Figures

Fig. 1
Fig. 1
Cementless femoral stem Logical – initial model.
Fig. 2
Fig. 2
Photographs of a Logical stem removed due to infection. The images show clear bone growth at the porous surface of the stem.
Fig. 3
Fig. 3
Radiographical aspect of the Logical cementless stem – left hip arthroplasty performed in 2012.
Fig. 4
Fig. 4
LOGICAL CM implant survival in patients operated from January 2004 to December 2009. Over 95% of the implants had a mean survival of 12.72 ± 0.09 years (mean ± standard deviation) with a confidence interval of 12.57–12.87 years.
Fig. 5
Fig. 5
LOGICAL CM implant survival in patients operated from January 2004 to December 2009 evaluating differences between genders. There was no difference in the mean implant survival comparing males and females. The Log Ranl test (Mantel-Cox) was used ( p  = 0.878). The mean survival was 12.74 ± 0.10 years for females and 12.73 ± 0.13 years for males.
Fig. 6
Fig. 6
The cumulative risk of failure of the LOGICAL CM implant in patients operated from January 2004 to December 2009 over 12.5 years was 10.7%.
Fig. 7
Fig. 7
LOGICAL CM implant survival in patients operated from January 2010 to December 2015. Over 98% of the implants had a mean survival of 7.89 ± 0.04 years (mean ± standard deviation), with a confidence interval of 7.81–7.98 years.
Fig. 8
Fig. 8
LOGICAL CM implant survival of patients operated from January 2010 to December 2015 evaluating differences between genders. There was no difference in the mean implant survival comparing males and females. The Log Ranl test (Mantel-Cox) ( p  = 0.287) was used. The mean survival was 7.94 ± 0.04 years for females and 7.85 ± 0.06 years for males.
Fig. 9
Fig. 9
The cumulative risk of failure of the LOGICAL CM implant in patients operated from January 2010 to December 2015 over 8 years was 6.51%.
Fig. 10
Fig. 10
Femoral components sizes.
Fig. 1
Fig. 1
Haste femoral não cimentada Logical – modelo inicial.
Fig. 2
Fig. 2
Fotografias de uma haste Logical removida devido a infecção. Imagens demostrando nítido crescimento ósseo para a superfície porosa da haste.
Fig. 3
Fig. 3
Aspecto radiográfico da haste não cimentada Logical – artroplastia do quadril esquerdo realizada em 2012.
Fig. 4
Fig. 4
Sobrevida do implante LOGICAL CM dos pacientes operados entre janeiro de 2004 e dezembro de 2009. Um total de 95,1% dos implantes tiveram uma sobrevida média de 12,72 ± 0,09 anos (média ± desvio padrão), sendo 12,57–12,87 anos o intervalo de confiança.
Fig. 5
Fig. 5
Sobrevida do implante LOGICAL CM dos pacientes operados entre janeiro de 2004 e dezembro de 2009 avaliando diferenças entre os sexos. Não houve diferença na sobrevida média do implante comparando os sexos masculino e feminino. Foi utilizado teste de Log Ranl (Mantel-Cox) ( p  = 0,878). Sobrevida média de 12,74 ± 0,10 anos para o sexo feminino e de 12,73 ± 0,13 meses para o sexo masculino.
Fig. 6
Fig. 6
Risco cumulativo de falha do implante LOGICAL CM dos pacientes operados entre janeiro de 2004 e dezembro de 2009 ao longo de 12,5 anos foi de 10,7%.
Fig. 7
Fig. 7
Sobrevida do implante LOGICAL CM dos pacientes operados entre janeiro de 2004 e dezembro de 2009. Um total de 98,5% dos implantes tiveram uma sobrevida média de 7,89 ± 0,04 anos (média ± desvio padrão), sendo 7,81–7,98 anos o intervalo de confiança.
Fig. 8
Fig. 8
Sobrevida do implante LOGICAL CM dos pacientes operados entre janeiro de 2004 e dezembro de 2009 avaliando diferenças entre os sexos. Não houve diferença na sobrevida média do implante comparando os sexos masculino e feminino. Foi utilizado teste de Log Ranl (Mantel-Cox) ( p  = 0,287). Sobrevida média de 7,94 ± 0,04 anos para o sexo feminino e de 7,85 ± 0,06 anos para o sexo masculino.
Fig. 9
Fig. 9
O risco cumulativo de falha do implante LOGICAL CM dos pacientes operados entre janeiro de 2004 e dezembro de 2009 ao longo de 8 anos foi de 6,51%.
Fig. 10
Fig. 10
Tamanhos dos componentes femorais.
See this image and copyright information in PMC

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