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Related Experiment Video

Updated: Aug 10, 2025

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
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Bone Marrow Edema Injury Patterns in the Pediatric Knee: An MRI Study.

Daniel W Green1, Sofia Hidalgo Perea1, Anne M Kelly2

  • 1Division of Pediatric Orthopedics, Hospital for Special Surgery, New York, NY, USA.

HSS Journal : the Musculoskeletal Journal of Hospital for Special Surgery
|February 13, 2023
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Summary

Pediatric knee MRI reveals 6 distinct bone marrow edema patterns linked to specific injuries. This classification aids clinicians in identifying injury mechanisms in children with traumatic knee pain.

Keywords:
MRIbone bruise injury patternkneelower extremitypediatricssports

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Area of Science:

  • Pediatric Radiology
  • Orthopedic Imaging
  • Musculoskeletal MRI

Background:

  • Symptomatic pediatric patients frequently exhibit traumatic bone marrow edema (BME) on magnetic resonance imaging (MRI).
  • Understanding BME patterns is crucial for diagnosing knee injuries in children.

Purpose of the Study:

  • To associate specific MRI-identified BME patterns with distinct injury mechanisms in pediatric knee injuries.
  • To classify BME patterns into six categories: patellar dislocation, extensor mechanism overload, hyperextension, single compartment impaction, ligament avulsion/translation, and direct contusion.

Main Methods:

  • Retrospective review of 314 pediatric knee MRIs (ages 3-18) using a standard protocol.
  • Independent classification of traumatic BME patterns by a musculoskeletal radiologist and orthopedic surgeon.
  • Analysis of MRI images, reports, and assigned injury patterns.

Main Results:

  • 62 MRIs met inclusion criteria; 40 boys and 22 girls with an average age of 12.2 years.
  • Patellar dislocation (35%) and extensor mechanism overload (22%) were the most frequent injury patterns.
  • Substantial inter-rater concordance (κ = .766) was achieved; 92% of BME showed severe signal intensity.

Conclusions:

  • Pediatric knee BME can be categorized into six specific injury patterns, potentially aiding clinicians in recognizing injury mechanisms.
  • The relative strength of pediatric knee ligaments and tendons may contribute to BME prevalence.
  • Further research is needed to evaluate clinical outcomes associated with these BME patterns.