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Radiological assessment of irreducible posterolateral knee subluxation after dislocation due to interposition of the vastus medialis: a case report

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Abstract

Knee dislocation is a serious and relatively uncommon traumatism that every emergency room is supposed to diagnose and treat rapidly. Most of the time these dislocations reduce spontaneously or with closed reduction. If a subluxation persists, an incarceration of soft tissue in the joint must be suspected. Irreducible knee subluxations after dislocation are rare entities better described in the orthopaedic than in the radiological literature. However, the initial radiological assessment is an important tool to obtain the correct diagnosis, to detect neurovascular complications, and to plan the most suitable treatment. In cases of delayed diagnosis, the functional prognosis of the joint and even the limb may be seriously compromised primarily because of vascular lesions. Thereby, vascular imaging is essential in cases of dislocation of the knee, and we will discuss the role of angiography and the more recent use of computed tomography angiography or magnetic resonance angiography. Our patient presented with an irreducible knee subluxation due to interposition of the vastus medialis, and we will review the classical clinical presentation and ‘do not miss’ imaging findings on conventional radiography, computed tomography angiography, and magnetic resonance imaging. Finally, we will also report the classical imaging pathway indicated in knee dislocation, with a special emphasis on the irreducible form.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Hôpitaux Universitaires de Genève, Service de Radiologie, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland

    Emilie Paulin, Daniel Arditi & Christoph Becker

  2. Hôpitaux Universitaires de Genève, Service d’Orthopédie, Geneva, Switzerland

    Sana Boudabbous & Jean-Damien Nicodème

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  1. Emilie Paulin
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  2. Sana Boudabbous
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  3. Jean-Damien Nicodème
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  4. Daniel Arditi
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  5. Christoph Becker
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Correspondence to Emilie Paulin.

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Paulin, E., Boudabbous, S., Nicodème, JD. et al. Radiological assessment of irreducible posterolateral knee subluxation after dislocation due to interposition of the vastus medialis: a case report. Skeletal Radiol 44, 883–888 (2015). https://doi.org/10.1007/s00256-014-2085-1

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  • DOI: https://doi.org/10.1007/s00256-014-2085-1

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