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Reinbacher, P; Smolle, MA; Friesenbichler, J; Draschl, A; Leithner, A; Maurer-Ertl, W.
Three-year migration analysis of a new metaphyseal anchoring short femoral stem in THA using EBRA-FCA.
Sci Rep. 2022; 12(1): 17173 Doi: 10.1038/s41598-022-22160-w [OPEN ACCESS]
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Führende Autor*innen der Med Uni Graz
Reinbacher Patrick
Smolle Maria Anna
Co-Autor*innen der Med Uni Graz
Friesenbichler Jörg
Leithner Andreas
Maurer-Ertl Werner

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Cementless calcar-guided femoral short stems in total hip arthroplasty (THA) have become increasingly popular over the years. Early distal migration of femoral stems measured by Einzel-Bild-Roentgen Analyse, Femoral Component Analyse (EBRA-FCA) has been reported to be a risk factor for aseptic loosening. The aim of this study was to analyse axial migration behavior and subsidence of a new short stem (launched in 2015) over a follow-up period of 3 years. According to the study protocol, 100 hip osteoarthritis patients who consecutively received an unilateral cementless calcar-guided short stem (ANA.NOVA proxy) at a single department were prospectively included in this mid-term follow-up study. Thirteen patients were lost to follow-up, resulting in 87 patients with unilateral THA who fulfilled the criteria for migration analysis with EBRA-FCA. The cohort comprised 41 males (mean age: 60 ± 16.5; mean BMI (Body Mass Index): 30 ± 13) and 46 females (mean age: 61 ± 15.5; mean BMI: 27 ± 10). Seven standardized radiographs per patient were analyzed with EBRA-FCA. An average migration of 2.0 mm (0.95-3.35) was observed within the first 3 years. The median increase during the first year was higher than in the second and third year (1.2 mm [IQR: 0.5-2.15] vs. 0.3 mm [IQR: 0.1-0.6 mm] vs. 0.25 mm [IQR: 0.1-0.5 mm]. Detected migration did not lead to stem loosening, instability, dislocation, or revision surgery in any patient. A higher risk for subsidence was observed in male and heavyweight patients, whereas the female gender was associated with a lower risk. No correlation between migration and revision could be observed. Although moderate subsidence was detectable, the performance of the short stem ANA.NOVA proxy is encouraging. Yet, its use may be re-considered in overweight and male patients due to more pronounced subsidence.
Find related publications in this database (using NLM MeSH Indexing)
Adult - administration & dosage
Aged - administration & dosage
Arthroplasty, Replacement, Hip - adverse effects, methods
Female - administration & dosage
Femur - surgery
Follow-Up Studies - administration & dosage
Hip Prosthesis - administration & dosage
Humans - administration & dosage
Male - administration & dosage
Middle Aged - administration & dosage
Osteoarthritis, Hip - diagnostic imaging, surgery
Prosthesis Design - administration & dosage
Retrospective Studies - administration & dosage

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