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Transient medial patellar dislocation: injury patterns at US and MR imaging

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Abstract

Medial dislocation of the patella is an unusual entity. It is usually an iatrogenic complication of surgical lateral retinacular release. We describe the clinical, ultrasound (US), and magnetic resonance (MR) imaging features of a transient medial patellar dislocation in a 19-year-old patient with trochlear groove dysplasia presenting no surgical history. US showed acute injury to the lateral patellar retinaculum with complete avulsion at its patellar insertion. MR imaging confirmed the complete tear of the lateral patellar retinaculum and disclosed contusion of the anteromedial portion of the medial femoral condyle and lateral patella. This case is noteworthy because the injury patterns of patellar soft tissue restraints differ markedly from the classical features of lateral patellar dislocation.

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Authors and Affiliations

  1. Radiology Department, Hôpital Sainte-Marguerite, 270 Boulevard de Sainte-Marguerite, 13009, Marseille, France

    Thomas Le Corroller, Melania Dediu & Pierre Champsaur

  2. Anatomy Department, Faculté de Médecine de Marseille, 13005, Marseille, France

    Thomas Le Corroller & Pierre Champsaur

Authors
  1. Thomas Le Corroller
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  2. Melania Dediu
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  3. Pierre Champsaur
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Correspondence to Thomas Le Corroller.

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Le Corroller, T., Dediu, M. & Champsaur, P. Transient medial patellar dislocation: injury patterns at US and MR imaging. Skeletal Radiol 38, 519–523 (2009). https://doi.org/10.1007/s00256-009-0657-2

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  • DOI: https://doi.org/10.1007/s00256-009-0657-2

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