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Bone marrow changes related to disuse.

Lorenzo Nardo1, David N Sandman, Warapat Virayavanich

  • 1Musculoskeletal and Quantitative Imaging Group (MQIR), Department of Radiology, University of California, San Francisco, San Francisco, CA, USA, Lorenzo.Nardo@ucsf.edu.

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Summary
This summary is machine-generated.

Bone marrow changes on knee MRI are common after limb immobilization. These signal abnormalities peak 10-25 weeks post-unloading and resolve within a year.

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Area of Science:

  • Radiology
  • Orthopedics
  • Bone Marrow Imaging

Background:

  • Bone marrow signal changes can occur following periods of unloading or immobilization.
  • Understanding these changes is crucial for accurate interpretation of knee MRI scans.

Purpose of the Study:

  • To evaluate bone marrow signal abnormalities on knee MRI after 3- to 6-week periods of lower extremity unloading.
  • To characterize the temporal evolution and patterns of these bone marrow changes.

Main Methods:

  • 30 patients underwent serial knee MRI after lower extremity immobilization.
  • Bone marrow signal abnormalities were analyzed for severity, pattern, and signal characteristics.
  • Statistical analysis included Spearman's rank correlation and Kendall's tau.

Main Results:

  • All patients showed abnormal bone marrow findings post-unloading, peaking at 10-25 weeks.
  • Abnormalities decreased significantly within one year.
  • High severity scores correlated with confluent and patchy bone marrow patterns.

Conclusions:

  • Unloading-related bone marrow signal abnormalities are consistent findings on knee MRI.
  • These changes are most prominent 10-25 weeks after immobilization, presenting as confluent and patchy hyperintense patterns.