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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Excellent reliability for MRI grading and prognostic parameters in acute hamstring injuries.

B Hamilton1, R Whiteley2, E Almusa3

  • 1Department of Sports Medicine, Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar High Performance Sport New Zealand, Auckland, New Zealand.

British Journal of Sports Medicine
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

Experienced radiologists show high reliability in grading hamstring injuries using MRI. This ensures consistent assessment for research and clinical practice, improving patient outcome predictions.

Keywords:
Hamstring injuriesMRI

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Area of Science:

  • Radiology
  • Sports Medicine
  • Musculoskeletal Imaging

Background:

  • MRI parameters and categorical grading are used to predict hamstring injury outcomes.
  • Reliability and smallest detectable difference (SDD) of these MRI measures were previously unevaluated.
  • Variability in results may stem from reporting differences rather than actual injury status.

Purpose of the Study:

  • To evaluate the interobserver and intraobserver reliability of MRI grading and prognostic parameters for hamstring injuries.
  • To determine the smallest detectable difference (SDD) for these MRI measures.
  • To establish confidence in MRI-based assessments for hamstring injuries.

Main Methods:

  • Two radiologists assessed 25 hamstring injuries using Peetrons grading and specific MRI parameters (distance, extent, cross-sectional area, volume).
  • Interobserver and intraobserver reliability were calculated.
  • Smallest detectable differences (SDD) were determined for each variable.

Main Results:

  • Grading distribution: 3 Grade 0 (12%), 11 Grade 1 (44%), 9 Grade 2 (36%), 2 Grade 3 (8%).
  • Excellent reliability for grading (Cronbach's α: interobserver 1.00, intraobserver 0.96).
  • High reliability for prognostic MRI parameters (ICC: 0.77–1.0), with varying SDDs.

Conclusions:

  • High interobserver and intraobserver reliability for MRI grading and prognostic parameters in acute hamstring injuries.
  • Scoring hamstring injuries by experienced radiologists is reproducible in clinical practice and research.
  • Documented SDDs enable meaningful clinical inferences from changes in MRI status.