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Impact magnitudes applied by surgeons and their importance when applying the femoral head onto the Morse taper for total hip arthroplasty

  • Orthopaedic Surgery
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Abstract

Introduction

This study was designed to test whether the number of impacts, the experience of the surgeon or impact force made significant difference in pull off forces.

Materials and methods

The forces applied by 10 orthopaedic surgeons (five residents and five attending staff) to impact the femoral head onto the trunnion of a femoral component were recorded. The resultant forces were then divided into four energy levels and compared to determine if the number of impacts would make a difference in pull off strength.

Results

No significant differences existed between the resident versus attending groups in magnitude of force applied. Through ANOVA testing, it was found that at each of the energy levels, multiple blows demonstrated a significant pull off strength difference compared to a single blow. Increased pull off force was also noted when the magnitude of force of the applied blows was increased.

Conclusion

We recommend at least two firm, axially aligned blows to impact the femoral head onto the trunnion intra-operatively.

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Acknowledgments

The authors would like to thank Akron General Medical Center for their financial support, and Smith and Nephew (Memphis, TN, USA) for donation of the implants.

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Authors and Affiliations

  1. Department of Orthopaedics, ProMedica Health System, Harris McIntosh Tower, 2121 Hughes Drive, Suite 310, Toledo, OH, 43606, USA

    Jake P. Heiney

  2. Department of Biomedical Engineering, The University of Akron, Akron, OH, USA

    Suneel Battula, Anand Parikh, Rebecca Blice & Glenn O. Njus

  3. Department of Orthopaedics, Akron General Medical Center, Akron, OH, USA

    Gregory A. Vrabec & Andrew J. Schoenfeld

Authors
  1. Jake P. Heiney
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  2. Suneel Battula
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  3. Gregory A. Vrabec
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  4. Anand Parikh
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  5. Rebecca Blice
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  6. Andrew J. Schoenfeld
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  7. Glenn O. Njus
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Corresponding author

Correspondence to Jake P. Heiney.

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Heiney, J.P., Battula, S., Vrabec, G.A. et al. Impact magnitudes applied by surgeons and their importance when applying the femoral head onto the Morse taper for total hip arthroplasty. Arch Orthop Trauma Surg 129, 793–796 (2009). https://doi.org/10.1007/s00402-008-0660-4

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  • DOI: https://doi.org/10.1007/s00402-008-0660-4

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