Health Policy & EconomicsNew Implant Introduction in Total Hip Arthroplasty Using Radiostereometric Analysis: A Cautionary Note
Section snippets
Methods
We reviewed the published literature since November 2012 for studies using RSA in the assessment of cementless femoral components. The electronic databases PubMed, EMBASE, and Google Scholar were searched using the following key words: radiostereometric analysis; RSA; femoral stem; cementless; and arthroplasty. The search was completed in July 2018. RSA studies were included in this review if the study reported on a cementless stem that was not previously reported in the systematic review by de
Results
The 2-year distal migration was described for 10 of these stems from RSA studies (Cerafit, CFP, CUT, Fitmore, Furlong, M/L Taper, Nanos, Scyon, Synergy, and VerSys) (Table 1). Of these 10 prostheses, 1-year distal migration was presented for 8 stems (Cerafit, CFP, CUT, Fitmore, Furlong, Nanos, Scyon, and VerSys). No data concerning 1-year distal migration were available for M/L Taper and Synergy. Furthermore, no data concerning the distal migration was found for the Proxima stem. Rather, the
Discussion
This study looked at the correlation between femoral stem RSA data at 2 years, with long-term aseptic revision rates of cementless femoral stems. We found that the RSA data did not universally predict long-term stem fixation. In 2 of the 11 cases (18%), the RSA study incorrectly predicted the ability of the cementless stem to reliably osseointegrate. In 1 case, the RSA data incorrectly predicted that the implant would be unstable, and in the other case it incorrectly predicted that the stem
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Contributing factors to the initial femoral stem migration in cementless total hip arthroplasty of postmenopausal women
2021, Journal of BiomechanicsCitation Excerpt :In our previous studies, women with normal systemic BMD exhibited minimal stem subsidence (0.5 mm − 0.7 mm) independently of the femoral stem design, including an anatomically designed stem (Aro et al., 2012) and a double-wedged straight femoral stem (Aro et al., 2018b). Reporting RSA results in a universal way, including identification and interpretation of the outliers, can improve the potential of RSA in prediction of implant survival (de Vries et al., 2014; Frazer and Tanzer, 2020). However, no clear definitions have been defined for RSA outliers.
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One or more of the authors of this paper have disclosed potential or pertinent conflicts of interest, which may include receipt of payment, either direct or indirect, institutional support, or association with an entity in the biomedical field which may be perceived to have potential conflict of interest with this work. For full disclosure statements refer to https://doi.org/10.1016/j.arth.2019.10.004.