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Scientific Articles   |    
Mid-Term Results of Total Hip Arthroplasty with the CementLess Spotorno (CLS) System
P.B. de Witte, MD, BSc1; R. Brand, PhD2; H.G.W. Vermeer, MD3; H.J.L. van der Heide, MD, PhD1; A.F.W. Barnaart, MD, PhD4
1 Department of Orthopaedics, Leiden University Medical Center, Postzone J11R, Postbus 9600, 2300 RC Leiden, The Netherlands. E-mail address for P.B. de Witte: p.b.de_witte@lumc.nl. E-mail address for H.J.L. van der Heide: H.J.L.van_der_Heide@lumc.nl
2 Department of Medical Statistics & BioInformatics, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands. E-mail address for R. Brand: r.brand@lumc.nl
3 Department of Orthopaedics, Meander Medical Center, Postbus 1502, 3800 BM Amersfoort, The Netherlands. E-mail address: hgw.vermeer@meandermc.nl
4 Department of Orthopaedics, Deventer Hospital, Nico Bolkesteinlaan 75, 7416 SE Deventer, The Netherlands. E-mail address: A.F.W.Barnaart@dz.nl
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Disclosure: One or more of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of an aspect of this work. None of the authors, or their institution(s), have had any financial relationship, in the thirty-six months prior to submission of this work, with any entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. Also, no author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

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Investigation performed at Meander Medical Center, Amersfoort, and Leiden University Medical Center, Leiden, The Netherlands

Copyright © 2011 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2011 Jul 06;93(13):1249-1255. doi: 10.2106/JBJS.I.01792
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Abstract

Background: 

Except for those reported by the designers, there are no published mid-term results of the use of the CementLess Spotorno (CLS) Total Hip Arthroplasty system. We present the results of (1) a ten to seventeen-year follow-up prospective cohort study of this system, and (2) retrospective analyses of factors influencing clinical and radiographic outcomes.

Methods: 

We studied a series of 102 consecutive CLS arthroplasties with a minimal duration of follow-up of ten years. Indications for the procedures were osteoarthritis (n = 90), rheumatoid arthritis (n = 8), and femoral head osteonecrosis (n = 4). The Merle d'Aubigné-Postel score, polyethylene wear, and radiographic status were recorded at regular intervals. Survival analyses, repeated-measures analysis of variance, and a nested case-control study (with the cases having early revision due to aseptic cup loosening within ten years after the index procedure and the controls having no early cup revision) were used for evaluation.

Results: 

There were fourteen revisions, including nine due to aseptic cup loosening. The ten-year Kaplan-Meier survival rate was 92.2% (95% confidence interval [CI] = 86.9 to 97.5) with revision for any reason as the end point. The fifteen-year survival rate was 78.4% (95% CI = 63.9 to 92.9) with revision for any reason as the end point, 81.6% (95% CI = 66.7 to 96.5) with revision due to aseptic cup loosening as the end point, and 99.0% (95% CI = 97.0 to 100.0) with revision due to aseptic stem loosening as the end point. The average amount of polyethylene wear at the time of final follow-up was 1.92 mm (range, 0.6 to 4.3 mm). The wear rate in the cases was significantly higher than that in the controls (0.31 vs. 0.16 mm/yr, p < 0.001). Factors with a significant effect on polyethylene wear were age at surgery (a 0.3-mm increase per every ten years younger, p = 0.001) and a larger head component (an effect of 0.53 mm for the 32 vs. the 28-mm component; p < 0.0001). Male sex had an effect of −0.66 point (p = 0.07) on the final Merle d'Aubigné-Postel score.

Conclusions: 

The results of this CLS system, particularly with regard to the femoral stem, are comparable with those with other reliable cementless systems. Nevertheless, the prevalence of aseptic acetabular cup loosening in the second decade after the operation demonstrates a potentially substantial problem with regard to long-term survival. A high polyethylene wear rate, male sex, a younger age at the time of surgery, and a 32-mm head component size are related to inferior clinical outcomes and a higher risk of implant revision.

Level of Evidence: 

Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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