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Related Experiment Videos

Os acromiale in a baseball catcher

J C Sterling1, M C Meyers, W Chesshir

  • 1Department of Physical Medicine and Rehabilitation, University of Texas Southwestern, Dallas 75235-9055, USA.

Medicine and Science in Sports and Exercise
|June 1, 1995
PubMed
Summary
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An unfused os acromiale, a rare bone in the shoulder, can cause impingement syndrome. Surgical intervention is recommended for persistent symptoms or rotator cuff tears associated with this condition.

Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Anatomy

Background:

  • Shoulder impingement syndrome often results from rotator cuff issues and instability.
  • An uncommon but significant cause is a nonfused os acromiale, a failure of acromion ossification centers to fuse.

Observation:

  • Os acromiale occurs in 1.4% of the population, frequently bilateral, with nonunion typically between meso-acromion and meta-acromion.
  • Diagnosis is confirmed via X-ray (AP, axillary views) and CT scans.
  • Most cases of os acromiale are asymptomatic.

Findings:

  • In symptomatic cases, os acromiale can lead to recalcitrant impingement syndrome and rotator cuff tears.
  • Surgical fusion or resection of the ossicle is the recommended treatment for associated pathology.

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Implications:

  • Recognizing os acromiale is crucial for diagnosing persistent shoulder impingement.
  • Surgical management can effectively resolve symptoms and address rotator cuff pathology in affected individuals.