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Unusual presentation of more common disease/injury
CASE REPORT
Intra-articular dislocation of the patella: a rare variant to an uncommon injury
  1. Sushil Rangdal1,
  2. Vikas Bachhal2,
  3. Saurabh Vashisht2 and
  4. Mandeep Singh Dhillon2
  1. 1 Orthopaedics, Sunrise Global Superspeciality Hospital, Nanded, India
  2. 2 Department of Orthopaedics, Post Graduate Institute of Medical Education and Research, Chandigarh, Chandigarh, India
  1. Correspondence to Dr Vikas Bachhal, vikasbachhal{at}gmail.com

Abstract

Horizontal intra-articular dislocation of the patella is a very rare traumatic entity. We present an unusual case of horizontal intra-articular dislocation in which the patellar articular surface was facing upwards besides having an avulsion of the quadriceps tendon from the superior pole. There was associated posterolateral knee subluxation, which has not been described with intra-articular dislocation of the patella. A 20-year-old man presented with open patellar dislocation and locked knee after a roadside accident. The patient was managed successfully by open reduction and repair of the quadriceps tendon. There was buttonholing of the medial femoral condyle through the medial retinaculum leading to irreducible dislocation. A special reduction manoeuvre was employed to bring the knee to its normal alignment. Knowledge of this injury pattern is of utmost importance for proper recognition and appropriate allocation of the surgical technique.

  • ligament rupture
  • knee injuries
  • orthopaedics
  • tendon rupture
  • orthopaedic and trauma surgery

https://doi.org/10.1136/bcr-2018-228098

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    Footnotes

    • Contributors SR was involved in the initial assessment, operated upon the patient and contributed towards the writing of the case report. VB was involved in the management and further follow-up of the patient and contributed towards the writing of the case report. SV was involved in the follow-up and contributed towards the writing of the case report. MSD was the supervising consultant and supervised the management of the patient and the writing of the case report.

    • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

    • Competing interests None declared.

    • Provenance and peer review Not commissioned; externally peer reviewed.

    • Patient consent for publication Obtained.