New Implant Introduction in Total Hip Arthroplasty Using Radiostereometric Analysis: A Cautionary Note

Frazer, Abbey; Tänzer, Michael

doi:10.1016/j.arth.2019.10.004

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…They suggested that RSA data is a predictor, but not necessarily the only parameter to dictate a successful clinical outcome. This argument has been advanced by Frazer and Tanzer who concluded that RSA should be used as an adjunct tool, rather than the sole criterion for stem assessment 17 . We agree that early analysis of RSA data is important and should be combined with clinical outcomes data, particularly when assessing new stem designs.…”

Section: Discussionmentioning

confidence: 78%

Two‐year migration characteristics of a novel cementless femoral stem: a radiostereometric analysis and clinical outcomes study

Coffey

Sorial

Sharma

et al. 2021

ANZ Journal of Surgery

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Background Radiostereometric analysis (RSA) is an established high precision tool enabling us to detect early implant migration in total hip arthroplasty. The aim of this study is to present the RSA and clinical results of a new cementless hip stem and to compare those with established benchmarks. Methods A total of 45 patients (46 hips) undergoing total hip arthroplasty were available for full radiographic and clinical assessment at 2 years post‐operatively. Mean patient age was 69 (range 43–85) years and mean body mass index was 29 (range 21–38) kg/m2. RSA was undertaken at day 1, 6 weeks, 6 months and 1 and 2 years post‐operatively. Oxford hip score and EQ‐5D‐5L scores were recorded preoperatively and at the same other time points. Results were compared to published data of established implants. Results At 2 years, mean subsidence and retroversion were 0.61 mm (standard deviation 0.7 mm, range −0.19 to 3.06 mm) and 0.44° (standard deviation 0.81°, range 0.98 to 3.29°), respectively. Stem migration occurred primarily in the first 6 weeks with no detectable subsidence or rotation at 6 months or 2 years. Mean Oxford hip score and EQ‐5D‐5L improved from 18.6 to 44.7, and 69 to 86, respectively. There was one cup‐only revision and no revisions for stem loosening. Conclusion RSA serves as an accurate measure of femoral stem stability early in the post‐operative period. Our data confirm that stability occurs as early as 6 weeks and is sustained at 2 years. The Paragon stem demonstrates stability parameters at 2 years that exceed other established benchmark implants.

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Section: Discussionmentioning

confidence: 78%