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Micromotion and stress shielding between taper fluted and cylindrical femoral stems for Paprosky bone deficiency type IIIB

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Abstract

Purpose

Taper fluted and cylindrical femoral stems have been commonly used for revision surgery with femoral bone loss. Shape and material differences between taper fluted and cylindrical confused surgeons whether superiority and inferiority in comparisons especially for type IIIB Paprosky bone deficiency. This study aims to investigate the micromotion between implant and bone interface and stress distribution around the implant in human cadaveric experiments.

Methods

Paired comparisons of 7 cadavers between taper fluted stem and cylindrical stem were tested under dynamic cyclic loading.

Results

The results showed appropriate bone-implant micromotions for bone osteointegration could be observed between both taper fluted and cylindrical stems (85 ± 10 μm and 113 ± 80 μm respectively, p = 0.59). Taper fluted stem attained the load distribution from the proximal to distal surrounding bone (from 4.92 ± 2.87 MPa to 2.14 ± 1.43 MPa, p = 0.43), while the cylindrical stem type showed the proximal bone stress shielding (from 2.56 ± 0.76 MPa to 5.23 ± 0.77 MPa, p = 0.03).

Conclusion

Both taper fluted and cylindrical femoral stems provided an adequate initial stability with a proper micromotions for bone-implant osteointegration for type IIIB Paprosky femoral bone loss. The taper fluted femoral stem had better biomechanical advantage in terms of greater stress transfer to periprosthetic bone.

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Acknowledgements

The authors would like to express their sincere thanks to Zimmer Biomet Thailand for prostheses donation in this experiment. Aside from the donation, Zimmer Biomet Thailand was not involved in study design, data analysis and interpretation, or manuscript writing and submittal decision. The authors would like to thank the Cadaveric Surgical Training Center, Faculty of Medicine, Chiang Mai University for providing the cadavers used in this study (ORT-2560-04644).

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Correspondence to S. Limmahakhun.

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Limmahakhun, S., Adulkasem, N., Rungsiyakull, C. et al. Micromotion and stress shielding between taper fluted and cylindrical femoral stems for Paprosky bone deficiency type IIIB. Musculoskelet Surg 107, 391–396 (2023). https://doi.org/10.1007/s12306-023-00781-2

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  • DOI: https://doi.org/10.1007/s12306-023-00781-2

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