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Male adolescent with left knee pain after sports injury
  1. Jen-Kuei Liu,
  2. Jen-Tang Sun,
  3. Chih-Jung Chang
  1. Department of Emergency Medicine, Far Eastern Memorial Hospital, New Taipei City, Taiwan
  1. Correspondence to Dr Chih-Jung Chang, Department of Emergency Medicine, Far Eastern Memorial Hospital, New Taipei City, 220, Taiwan; chihjung0729{at}

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Clinical introduction

A 15-year-old male athlete presented to the ED with sudden-onset left knee pain noted while playing basketball. He felt a popping sensation during jumping, followed by severe pain and inability to extend his left knee. Physical examination showed an abnormal contour of the distal side of the left thigh and a sharp skin protrusion on his anterior left knee (figure 1).

Figure 1

Physical examination gives a clue to the diagnosis.


What is the most likely diagnosis?

  1. Patella tendon rupture

  2. Quadriceps tendon rupture

  3. Tibial tubercle avulsion fracture

  4. Osgood-Schlatter disease

Answer: C


Tibial tubercle is the …

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  • Contributors J-KL acquired the clinical data, drafted the manuscript and maintained contact and consent with the patient. J-TS served as scientific advisor and did revision of the manuscript. C-JC was responsible for editing the article and gave final approval to the manuscript.

  • 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; internally peer reviewed.