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MRI of Acute Bone Bruises: Timing of the Appearance of Findings in a Swine Model

¹ Department of Radiology, University of Wisconsin School of Medicine and Public Health, E3/311 Clinical Science Center, 600 Highland Ave., Madison, WI 53792-3252.
² Department of Orthopedics and Rehabilitation, University of Wisconsin School of Medicine and Public Health, Madison, WI.
³ Department of Pathology, University of Wisconsin School of Medicine and Public Health, Madison, WI.

View larger version (83K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1A —21-year-old male athlete with acute traumatic hip injury. Coronal T2-weighted fat-saturated image obtained 2 hours after acute injury does not show any bone marrow edema. Posterior labral tear was noted on axial T2-weighted imaging (not shown).

View larger version (73K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1B —21-year-old male athlete with acute traumatic hip injury. Coronal T2-weighted fat-saturated image obtained 3 months after injury shows focal area of abnormally increased T2 (arrow). Sagittal T1-weighted images (not shown) confirmed anterior location of this signal abnormality.

View larger version (16K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2 —Schematic of pneumatically accelerated mass system designed to impact swine patellae.

View larger version (11K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3 —Schematic of acceleration chamber fitted with optical sensors to measure final velocity.

View larger version (95K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4A —Control nontraumatized swine knee. Patellar and femoral ossification centers show high signal intensity on sagittal T1-weighted image (A) and low signal intensity on T2-weighted fat-saturated (B) and STIR (C) images.

View larger version (91K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4B —Control nontraumatized swine knee. Patellar and femoral ossification centers show high signal intensity on sagittal T1-weighted image (A) and low signal intensity on T2-weighted fat-saturated (B) and STIR (C) images.

View larger version (74K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4C —Control nontraumatized swine knee. Patellar and femoral ossification centers show high signal intensity on sagittal T1-weighted image (A) and low signal intensity on T2-weighted fat-saturated (B) and STIR (C) images.

View larger version (25K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5 —Graph of impacts of traumatized swine knees.

View larger version (110K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6 —Sagittal T1-weighted MR image of traumatized swine patella at 1 hour after injury shows low signal intensity (arrow) within patella.

View larger version (72K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7A —Traumatized swine patella. Sagittal STIR MR images at initial 1-hour scan (A) show edemalike signal intensity (arrow) within patella and at 30-hour scan (B) show increased signal intensity (arrow) within patella.

View larger version (73K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 7B —Traumatized swine patella. Sagittal STIR MR images at initial 1-hour scan (A) show edemalike signal intensity (arrow) within patella and at 30-hour scan (B) show increased signal intensity (arrow) within patella.

View larger version (81K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 8A —Traumatized swine patella. Sagittal STIR MR image at 1 hour after injury shows subtle subchondral edema (arrow). This area of abnormality increases in signal intensity by 12-hour sagittal image (B) (arrow). In B, there is also extensive high-signal abnormality in patella.

View larger version (79K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 8B —Traumatized swine patella. Sagittal STIR MR image at 1 hour after injury shows subtle subchondral edema (arrow). This area of abnormality increases in signal intensity by 12-hour sagittal image (B) (arrow). In B, there is also extensive high-signal abnormality in patella.

View larger version (147K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 9 —Photomicrograph of left patella of pig 7 shows replacement of approximately 80% of marrow space by edema, extravasated RBCs, and fibrin. (H and E, x200)

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