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The effects of different weight-bearing regimes on press-fit cup stability: a randomised study with five years of follow-up using radiostereometry

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Abstract

Purpose

There is little evidence to support immediate weight bearing after uncemented total hip arthroplasty (THA).

Methods

Thirty-seven patients with unilateral osteoarthritis of the hip received a press-fit cup. Cup stability was assessed with radiostereometry (RSA) over five years. Patients were randomised to immediate full weight bearing, or partial weight bearing for three months.

Results

At five years, we found no difference in micromotion as assessed with radiostereometry. Numerically, there was more proximal translation and increased inclination with immediate weight bearing, but these values barely exceeded the precision limit for the method. Pooled data for the two groups revealed translations of 0.1-0.3 mm and rotations of 0.2-0.3° over the five year follow-up period.

Conclusions

We found no adverse effects of immediate weight bearing after THA in relation to stability of these press-fit cups. Early mobilisation might have other advantages.

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Acknowledgments

This study could not have been performed without the strenuous work of our late colleague Dr. Håkan Ström. We are grateful to Monika Gelotte, RN, for skilful DXA measurements. Zimmer Inc. sponsored the study financially. They had no influence on study design, data collection or manuscript preparation.

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Authors and Affiliations

  1. Surgical Sciences, Orthopaedic, Uppsala, Sweden

    Olof Wolf, Per Mattsson, Jan Milbrink, Sune Larsson & Hans Mallmin

Authors
  1. Olof Wolf
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  2. Per Mattsson
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  3. Jan Milbrink
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  4. Sune Larsson
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  5. Hans Mallmin
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Corresponding author

Correspondence to Olof Wolf.

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Wolf, O., Mattsson, P., Milbrink, J. et al. The effects of different weight-bearing regimes on press-fit cup stability: a randomised study with five years of follow-up using radiostereometry. International Orthopaedics (SICOT) 36, 735–740 (2012). https://doi.org/10.1007/s00264-011-1413-5

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  • DOI: https://doi.org/10.1007/s00264-011-1413-5

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