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Postural stability after patient-specific interpositional knee spacer or total knee arthroplasty: a comparative study

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Abstract

Purpose

Total knee arthroplasty provides excellent results concerning functional demands, patient satisfaction and range of motion. Short-term results after implantation of patient-specific knee spacers also show encouraging results. We hypothesised that patient-specific interpositional devices provide better proprioception and postural stability by preserving the whole bone stock and both cruciate ligaments.

Methods

In this study we compared functional results, proprioception and postural stability 16 months after 20 consecutive patient-specific interpositional device implantations of the knee (group A) and 20 consecutive total knee arthroplasties (group B). Patients were evaluated using the Knee Society Score (KSS) and the Western Ontario and McMaster Universities Arthritis Index (WOMAC). Postural stability was analysed during single leg stance on a force platform (Biodex).

Results

There were no significant differences between both groups concerning functional results 16 months after the procedure. Concerning postural stability, significant differences were found between both groups. Comparing the operated-on and non-operated-on sides in single leg stance, the operated-on leg gained the same stability as the non-operated-on side in both groups.

Conclusions

The successful treatment of knee osteoarthritis can restore postural stability to the level of the unaffected side—independent from the implanted devices and with preservation of soft tissue and bone stock. Superior postural stability in joint-preserving patient-specific interpositional knee devices compared with total knee arthroplasty had to be attributed to the different age of both groups.

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Authors and Affiliations

  1. Orthopaedic Department, University Hospital Regensburg, Regensburg, Germany

    Juergen Goetz, Susanne Schiessl, Clemens Baier, Silvia Dullien, Joachim Grifka & Franz Koeck

  2. Asklepios Klinikum Bad Abbach, Medical Centre University of Regensburg, Kaiser-Karl V.-Allee 3, 93077, Bad Abbach, Germany

    Juergen Goetz

  3. Centre for Clinical Studies, University Medical Centre Regensburg, Regensburg, Germany

    Karolina Mueller

Authors
  1. Juergen Goetz
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  2. Susanne Schiessl
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  3. Clemens Baier
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  4. Silvia Dullien
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  5. Karolina Mueller
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  6. Joachim Grifka
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  7. Franz Koeck
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Correspondence to Juergen Goetz.

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Conflicts of interest

No conflict of interest exists. The other authors have no external sources of support. No company has had any role in the study design; the data collection, analysis and interpretation; the manuscript preparation; or the manuscript submission.

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Goetz, J., Schiessl, S., Baier, C. et al. Postural stability after patient-specific interpositional knee spacer or total knee arthroplasty: a comparative study. International Orthopaedics (SICOT) 41, 67–73 (2017). https://doi.org/10.1007/s00264-016-3266-4

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  • DOI: https://doi.org/10.1007/s00264-016-3266-4

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