Abstract
Purpose
Impingement is a major source for decreased range of motion (ROM) and dislocation in total hip arthroplasty (THA). In the current study we analyzed the impact of soft tissue impingement on ROM compared to bony and/or prosthetic impingement.
Methods
In the course of a prospective clinical trial 54 patients underwent cementless total hip arthroplasty in the lateral decubitus position using imageless navigation. The navigation device enabled intra-operative ROM measurements indicating soft tissue impingement. Post-operatively, all patients received postoperative 3D-CT. Absolute ROM without bony and/or prosthetic impingement was calculated with the help of a collision-detection-algorithm.
Results
Due to soft tissue impingement we found a reduced ROM of over 20° (p < 0.001) compared to bony and/or prosthetic impingement regarding flexion, extension, abduction and adduction and of over 10° regarding external rotation (p < 0.001). In contrast, soft tissue impingement showed less impact on internal rotation in 90° of flexion (p = 0.76). Multivariate analysis showed an association between BMI and flexion, whereas all other ROM directions were independent of BMI.
Conclusions
Soft tissue has a major impact on impingement-free ROM after THA. For the majority of movements, soft tissue restrictions are more important than bony and prosthetic impingement. Future models of patient individual joint replacement including pre-operative (CT) planning and intra-operative navigation should include algorithms additionally accounting for soft tissue impingement.
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Acknowledgments
The help of Ms. S. Kling, Ms. C. Jendrewski, Ms. M. Riedl, Mr. M. Schubert, Mr. A. Hapfelmeier, Mr. B. Messmer, Mr. L. Dohmen, and Dr. M. Haimerl in this project is appreciated.
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All procedures performed involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
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No author’s financial or any other conflicts of interest are related directly or indirectly to the subject of this article. Funding for this clinical trial was provided by the German Federal Ministry of Education and Research (BMBF; grant number 01EZ0915). No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.
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Woerner, M., Weber, M., Sendtner, E. et al. Soft tissue restricts impingement-free mobility in total hip arthroplasty. International Orthopaedics (SICOT) 41, 277–282 (2017). https://doi.org/10.1007/s00264-016-3216-1
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DOI: https://doi.org/10.1007/s00264-016-3216-1