Early stabilization of the uncemented Symax hip stem in a 2-year RSA study

Kruijntjens, Dennis Silvester Maria Gerardus; Koster, Lennard A; Kaptein, Bart L; Jutten, Liesbeth M.C.; Arts, Jacobus J.; Broeke, René H.M. ten

doi:10.1080/17453674.2019.1709956

Cited by 8 publications

(11 citation statements)

References 21 publications

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“…Osseointegration can be assumed if an RSA study shows stable migration values after 3 months. Nevertheless, the subsidence was higher than reported in other recent studies, where Y-translation is between -0.03 mm and -0.99 mm at 24 months (Nysted et al 2014, Weber et al 2014, Nebergall et al 2016, Mahmoud et al 2017, Hoornenborg et al 2018, Sesselmann et al 2018, Klein et al 2019, Kruijntjens et al 2020. Nebergall et al (2016) (the Taperloc stem), reported a single outlier of -0.9 mm with the rest of the cohort in a range of -0.1 mm to -0.2 mm.…”

Section: Primary Outcomecontrasting

confidence: 64%

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Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems: a randomized controlled RSA study involving 62 patients with 24-month follow-up

et al. 2020

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Background and purpose — Despite the good results after total hip arthroplasty (THA), new implants are continuously being developed to improve durability. The Echo Bi-Metric (EBM) THA stem is the successor to the Bi-Metric (BM) THA stem. The EBM stem includes many of the features of the BM stem, but minor changes in the design might improve the clinical performance. We compared the migration behavior with radiostereometric analysis (RSA) of the EBM stem and the BM stem at 24 months and evaluated the clinical outcome. Patients and methods — We randomized 62 patients with osteoarthritis (mean age 64 years, female/male 28/34) scheduled for an uncemented THA to receive either an EBM or a BM THA stem. We performed RSA within 1 week after surgery and at 3, 6, 12, and 24 months. The clinical outcome was evaluated using Harris Hip Score (HHS) and Oxford Hip Score (OHS). Results — At 24 months, we found no statistically significant differences in migration between the two implants. During the first 3 months both the EBM and the BM stems showed visible subsidence (2.5 mm and 2.2 mm respectively), and retroversion (2.5° and 2.2° respectively), but after 3 months this stabilized. The expected increase in HHS and OHS was similar between the groups. Interpretation — The EBM stem showed a migration at 24 months not different from the BM stem, and both stems display satisfying clinical results.

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Section: Primary Outcomecontrasting

confidence: 64%

“…Some subsidence of hip stems is generally accepted within the first 3 months, but after that osseointegration and stability should have occurred. Mean subsidence of up to 1 mm of the stem at 24 months has been reported (Nysted et al 2014, Weber et al 2014, Hoornenborg et al 2018, Sesselmann et al 2018, Kruijntjens et al 2020.…”

mentioning

confidence: 97%

Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems: a randomized controlled RSA study involving 62 patients with 24-month follow-up

et al. 2020

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“…On the contrary, no revisions caused by aseptic loosening of the Symax hip stem were reported in a Danish single-centre study [ 8 ]. Furthermore, early stabilization of the Symax hip stem was observed already after 4 weeks in a 2-year RSA study, and minimal subsidence of the Symax stems was measured in a 3-year EBRA-FCA study [ 7 , 17 ]. Another RSA study of the Symax hip stem also showed predominantly Y-translation and Y-rotation at 3 months, and zoledronic acid had no significant effect in this femoral stem migration [ 6 ].…”

Section: Discussionmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 94%

“…Furthermore, a 2-year follow-up dual-energy X-ray absorptiometry (DEXA) study showed improved bone remodelling compared to the Omnifit hip stem [4]. The stem showed early stabilization in 2 independent RSA studies, and excellent clinical outcomes in a 5-year clinical and radiographic follow-up study [5][6][7]. In a Danish implant registry study that included 1,055 total hip arthroplasties (THAs) in a single centre, the estimated 6.5-year survival rate of the Symax hip stem with all-cause revision as the endpoint was 97.5% (CI 96.6%-98.3%) [8].…”

Section: Introductionmentioning

confidence: 99%

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Survival and reasons for revision of the uncemented Symax hip stem: A Dutch Arthroplasty Register study

et al. 2021

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Aims Previous studies have already shown early proximal ingrowth, fast osseous integration, and a stable fit of the uncemented Symax hip stem, with excellent clinical and radiographic performance. Aims were to evaluate cumulative revision rates and reasons for revision of the Symax hip stem using Dutch Arthroplasty Register (LROI) data and to assess possible associations between patient characteristics and revision rate of the Symax hip stem. Patients and methods All total hip arthroplasties with the uncemented Symax hip stem registered in the LROI between 2007 and 2017 were included (n = 5,013). Kaplan-Meier survival analysis was performed to assess the cumulative 1, 5 and 7-year revision percentages. Cox proportional hazard regression analysis was performed to assess the association between patient and procedural characteristics, and revision arthroplasty of the stem. Results Cumulative 1, 5, and 7-year revision rates (with 95% confidence interval (CI)) for revision of any component were 1.5% (CI 1.2%-1.8%), 3.2% (CI 2.7%-3.7%), and 3.8% (CI 3.1%-4.4%) respectively. Cumulative 1, 5, and 7-year stem revision rates of the Symax hip stem were 0.9% (CI 0.6%-1.1%), 1.5% (CI 1.1%-1.9%), and 1.7% (CI 1.3%-2.1%) respectively. Periprosthetic fractures (n = 35) and loosening of the stem (n = 30) were the most common reasons for revision of the stem. Revision of the stem was associated with acute fracture as primary diagnosis (Hazard Ratio (HR) 2.4 (CI 1.3–4.3)), or history of a previous surgery to the affected hip (HR 2.7 (CI 1.4–5.2)). Conclusion This population-based registry study shows revision rates for the Symax hip stem comparable to those for best performing uncemented total hip arthroplasties in the Netherlands. Primary diagnosis of an acute fracture, and history of previous surgery on the affected hip, were significantly associated risk factors for revision of the Symax hip stem, and we discourage the use of the Symax hip stem in these patients.

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Funktionsprüfung einer innovativen biomechanisch optimierten und oberflächenmodifizierten kieferorthopädischen Minischraube – eine vergleichende Studie

Duske,

Turan,

Prinz

et al. 2024

J Orofac Orthop

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Early stabilization of the uncemented Symax hip stem in a 2-year RSA study

Cited by 8 publications

References 21 publications

Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems: a randomized controlled RSA study involving 62 patients with 24-month follow-up

Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems: a randomized controlled RSA study involving 62 patients with 24-month follow-up

Survival and reasons for revision of the uncemented Symax hip stem: A Dutch Arthroplasty Register study

Funktionsprüfung einer innovativen biomechanisch optimierten und oberflächenmodifizierten kieferorthopädischen Minischraube – eine vergleichende Studie

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