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Complex distal insertions of the tibialis posterior tendon: detailed anatomic and MR imaging investigation in cadavers

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Abstract

Purpose

The purpose of this report was to demonstrate the normal complex insertional anatomy of the tibialis posterior tendon (TPT) in cadavers using magnetic resonance (MR) imaging with anatomic and histologic correlation.

Material and methods

Ten cadaveric ankles were used according to institutional guidelines. MR T1-weighted spin echo imaging was performed to demonstrate aspects of the complex anatomic distal insertions of the TPT in cadaveric specimens. Findings on MR imaging were correlated with those derived from anatomic and histologic study.

Results

Generally, the TPT revealed a low signal in all MR images, except near the level of the medial malleolus, where the TPT suddenly changed direction and “magic angle” artifact could be observed. In five out of ten specimens (50%), a type I accessory navicular bone was found in the TPT. In all cases with a type I accessory navicular bone, the TPT had an altered signal in this area. Axial and coronal planes on MR imaging were the best in identifying the distal insertions of the TPT. A normal division of the TPT was observed just proximal to the insertion into the navicular bone in five specimens (100%) occurring at a maximum proximal distance from its attachment to the navicular bone of approximately 1.5 to 2 cm. In the other five specimens, in which a type I accessory navicular bone was present, the TPT directly inserted into the accessory bone and a slip less than 1.5 mm in thickness could be observed attaching to the medial aspect of the navicular bone (100%). Anatomic inspection confirmed the sites of the distal insertions of the components of the TPT.

Conclusion

MR imaging enabled detailed analysis of the complex distal insertions of the TPT as well as a better understanding of those features of its insertion that can simulate a lesion.

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Authors and Affiliations

  1. Department of Radiology, University of São Paulo, São Paulo, São Paulo, Brazil

    Daniel Pastore & Giovanni G. Cerri

  2. Department of Radiology, VA Medical Center, University of California, 3350 La Jolla Village Dr, San Diego, CA, 92161, USA

    Daniel Pastore, Berna Dirim, Mani Wangwinyuvirat, Clarissa L. Belentani, Parviz Haghighi, Debra J. Trudell, Giovanni G. Cerri & Donald L. Resnick

  3. Department of Histology, VA Medical Center, University of California, San Diego, CA, USA

    Parviz Haghighi

  4. Rua Jericó, 39—apto 42, São Paulo, SP, 05435-040, Brazil

    Daniel Pastore

Authors
  1. Daniel Pastore
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  2. Berna Dirim
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  3. Mani Wangwinyuvirat
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  4. Clarissa L. Belentani
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  5. Parviz Haghighi
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  6. Debra J. Trudell
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  7. Giovanni G. Cerri
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  8. Donald L. Resnick
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Correspondence to Daniel Pastore.

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Pastore, D., Dirim, B., Wangwinyuvirat, M. et al. Complex distal insertions of the tibialis posterior tendon: detailed anatomic and MR imaging investigation in cadavers. Skeletal Radiol 37, 849–855 (2008). https://doi.org/10.1007/s00256-008-0499-3

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  • DOI: https://doi.org/10.1007/s00256-008-0499-3

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