THA: More migration observed with Charnley femoral stem compared to Spectron EF stem .
This report has been verified
by one or more authors of the
original publication.
OrthoEvidence Journal (OE Journal) - ACE Report
OE Journal. 2013;1(11):31 Acta Orthop. 2011 Oct;82(5):538-44. Epub 2011 Sep 6150 patients with primary or secondary osteoarthritis of the hip were randomized to undergo THA with either a Charnley or Spectron EF femoral stem. The 2 year results indicate that the Spectron EF stem has superior stability when compared to the Charnley stem, which demonstrated significantly more stem retroversion and posterior translation. Future studies are required to determine if similar results are found over longer follow-up periods.
Was the allocation sequence adequately generated?
Was allocation adequately concealed?
Blinding Treatment Providers: Was knowledge of the allocated interventions adequately prevented?
Blinding Outcome Assessors: Was knowledge of the allocated interventions adequately prevented?
Blinding Patients: Was knowledge of the allocated interventions adequately prevented?
Was loss to follow-up (missing outcome data) infrequent?
Are reports of the study free of suggestion of selective outcome reporting?
Were outcomes objective, patient-important and assessed in a manner to limit bias (ie. duplicate assessors, Independent assessors)?
Was the sample size sufficiently large to assure a balance of prognosis and sufficiently large number of outcome events?
Was investigator expertise/experience with both treatment and control techniques likely the same (ie.were criteria for surgeon participation/expertise provided)?
Sì = 1
Incerto = 0,5
Non rilevante = 0
No = 0
La valutazione dei criteri di segnalazione valuta la trasparenza con cui gli autori riportano le caratteristiche metodologiche e sperimentali dello studio all'interno della pubblicazione. La valutazione è suddivisa in cinque categorie che vengono presentate di seguito.
3/4
Randomization
2/4
Outcome Measurements
2/4
Inclusion / Exclusion
4/4
Therapy Description
4/4
Statistics
Detsky AS, Naylor CD, O'Rourke K, McGeer AJ, L'Abbé KA. J Clin Epidemiol. 1992;45:255-65
L'Indice di Fragilità è uno strumento che aiuta l'interpretazione dei risultati significativi, fornendo una misura della forza di un risultato. L'Indice di Fragilità rappresenta il numero di eventi consecutivi che devono essere aggiunti a un risultato dicotomico per rendere il risultato non più significativo. Un numero piccolo rappresenta un risultato più debole, mentre un numero grande rappresenta un risultato più forte.
Perché questo studio era necessario ora?
There are many possible mechanisms that can cause femoral stem loosening in cemented total hip replacements including the material, design, and surface finish. Debonding between the cement and femoral stem initiates this loosening, and to address this issue there are many different femoral stem designs aimed at increasing fixation and preventing loosening. The Spectron femoral stem is increasingly being used and has resulted in successful outcomes; however, there is a lack of comparisons to other femoral stems.
Qual era la domanda di ricerca principale?
What effect does the use of a Charnley or Spectron EF femoral stem have on migration in patients with hip osteoarthritis undergoing cemented total hip replacement, measured over 2 year follow-up period?
- At 2 years, stem retroversion (mean internal rotation) was 2.3 and 0.7 degrees (p<0.001), and posterior translation (negative translation along z-axis) was 0.44mm and 0.17mm (p=0.002) for the patients in the Charnley group and Spectron EF groups respectively.
- At 2 years, subsidence (migration along y-axis) was 0.26mm for Charnley group, compared to 0.20mm for Spectron EF group (p=0.5).
Che cosa devo ricordare di più?
Results from the two year follow-up found that the Charnley stem had more significantly more stem retroversion and posterior translation, compared to the Spectron EF stem.
Come influenzerà l'assistenza ai miei pazienti?
Although the Spectron EF stem proved to be more stable throughout the 2 year duration of this study, these good short-term results do not necessarily translate into successful long-term outcomes. Therefore, studies with longer-term follow up periods, which evaluate the impact of design, materials and surface finish of the implant on loosening and resulting migration, are required.
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