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Osteochondroma of acromioclavicular joint
  1. Muhammad Nouman Baig1,
  2. Sandra O’Malley1,
  3. Christopher Fenelon2 and
  4. Ken Kaar1
  1. 1 Trauma & Orthopaedics, Galway University Hospitals, Galway, Ireland
  2. 2 Limerick University Hospital, Limerick, Ireland
  1. Correspondence to Dr Muhammad Nouman Baig, nouman142{at}


Osteochondroma is the most common type of benign bone tumour. It is a benign chondrogenic lesion derived from aberrant cartilage from the perichondral ring, and it commonly presents in the proximal humerus, proximal femur and knee. Osteochondroma is usually solitary but can be multiple with patients with hereditary multiple exostoses. Malignant changes happen in approximately 1% of cases. Osteochondroma usually causes local pain or swelling. We discuss a unique case of an osteochondroma that highlights the fact that osteochondroma can occur in the most unlikely places, and they should be properly visualised via radiography to evaluate any extensions and compromised surrounding structures before surgical intervention.

  • orthopaedic and trauma surgery
  • stiff shoulder

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  • Contributors MNB and SOM conceived of the presentation of the case report. MNB, SOM and CF collected data and wrote the manuscript. KK supervised the findings of this work and final manuscript. All authors discussed the results and contributed to the final 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; externally peer reviewed.

  • Patient consent for publication Obtained.

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