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Shoulder MRI after impingement test injection

A G Bergman1, M Fredericson

  • 1Department of Radiology, Stanford University Medical Center, CA 94305-5105, USA.

Skeletal Radiology
|September 8, 1998
PubMed
Abstract

Insights

Fluid injected during shoulder impingement tests typically resolves within three days. This study found that most patients had pre-injection fluid levels by day three, with no rotator cuff issues. A three-day waiting period is recommended before shoulder MRI after injection.

Area of Science:

  • Orthopedics
  • Radiology
  • Musculoskeletal Imaging

Background:

  • Impingement tests often involve injecting fluid into the shoulder joint.
  • The duration of injected fluid in the shoulder bursa and soft tissues is not well-established.
  • Understanding fluid resolution is crucial for accurate post-injection imaging.

Purpose of the Study:

  • To determine the resolution time of injected fluid from impingement tests in the shoulder.
  • To assess the impact of injections on rotator cuff signal on MRI.

Main Methods:

  • Prospective MRI study of six patients following shoulder impingement test injection.
  • Imaging performed immediately before and after injection, and at 3 days, 2 weeks, and 4 weeks.
  • Fluid distribution and rotator cuff signal abnormalities were graded.

Main Results:

  • In five of six patients, soft tissue fluid returned to baseline levels by 3 days post-injection.
  • No rotator cuff signal abnormalities related to the injection were observed.
  • Fluid resolution was rapid in the majority of cases.

Conclusions:

  • A 3-day delay is recommended between shoulder injection and MRI.
  • This delay helps prevent misinterpretation of fluid accumulation or related abnormalities.
  • Impingement test injections did not appear to cause rotator cuff signal changes in this cohort.

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