Accuracy of 3 Tesla magnetic resonance imaging using detection of fiber loss and a visual analog scale for diagnosing partial and complete cranial cruciate ligament ruptures in dogs

2017 ◽  
Vol 59 (1) ◽  
pp. 64-78 ◽  
Author(s):  
Constance G. Fazio ◽  
Peter Muir ◽  
Susan L. Schaefer ◽  
Kenneth R. Waller
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Visual Analog Scale ◽  
Cruciate Ligament ◽  
3 Tesla ◽  
Resonance Imaging ◽  
Analog Scale ◽  
Cranial Cruciate Ligament

Effects of mandibular advancement on brain activation during inspiratory loading in healthy subjects: a functional magnetic resonance imaging study

2006 ◽  
Vol 100 (2) ◽  
pp. 579-586 ◽  
Author(s):  
Koji Hashimoto ◽  
Takashi Ono ◽  
Ei-ichi Honda ◽  
Keiko Maeda ◽  
Hideo Shinagawa ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Visual Analog Scale ◽  
Healthy Subjects ◽  
Brain Activation ◽  
Mandibular Advancement ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Analog Scale

Oral appliances have been a popular treatment option for subjects with obstructive sleep apnea. However, little information is available on how brain activation induced by respiratory challenge is modulated by mandibular advancement with these appliances. We hypothesized that the brain activation caused by respiratory stress may be alleviated by mandibular advancement. Respiratory stress was induced in 12 healthy subjects by resistive inspiratory loading. The effects of mandibular advancement during resistive inspiratory loading were assessed subjectively by using a visual analog scale. These effects were also evaluated objectively by using blood oxygenation level-dependent functional magnetic resonance imaging. The score for the visual analog scale significantly decreased with mandibular advancement. Cortical deactivation, in association with mandibular advancement, was localized to several specific regions, including the left cingulate gyrus and the bilateral prefrontal cortexes. These regions are known to be involved in respiratory control. Our results suggest that mandibular advancement with an oral appliance appears to be useful for reducing respiratory stress, based on both subjective and neuronal criteria.

LOW-FIELD MAGNETIC RESONANCE IMAGING OF EARLY SUBCHONDRAL CYST-LIKE LESIONS IN INDUCED CRANIAL CRUCIATE LIGAMENT DEFICIENT DOGS

1998 ◽  
Vol 39 (3) ◽  
pp. 167-173 ◽  
Author(s):  
Debra K. Baird ◽  
John T. Hathcock ◽  
Steven A. Kincaid ◽  
Paul F. Rumph ◽  
John Kammermann ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cruciate Ligament ◽  
Resonance Imaging ◽  
Cranial Cruciate Ligament ◽  
Low Field ◽  
Subchondral Cyst

scholarly journals Comparison of High-field and Low-field Magnetic Resonance Imaging of Stifle Joint Disorders in Dogs

2016 ◽  
Vol 19 (3) ◽  
pp. 663-670 ◽  
Author(s):  
A. Przeworski ◽  
Z. Adamiak ◽  
J. Głodek
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
High Field ◽  
Cruciate Ligament ◽  
Resonance Imaging ◽  
Cranial Cruciate Ligament ◽  
Stifle Joint ◽  
Low Field ◽  
Secondary Damage ◽  
Magnetic Strength

AbstractThe most common cause of hindlimb lameness in dogs is cranial cruciate ligament rupture. In 48-77.3% of the population this trauma leads to secondary damage of the meniscus. Depending on the magnetic strength of the used device, different diagnostic accuracy can be achieved. The examination sensitivity of magnetic resonance imaging is affected by many factors which are independent of diagnostic strength, such as correct positioning of the patient, size of the stifle joint examined, or selection of the right protocol of sequences. Sensitivity of meniscus damage detection was 100% and 90%, respectively, in high- and low-field magnetic resonance. The best results were reported during examination of the stifle in dogs above 10 kg b.w. at a flexion angle of 145°, and in sagittal and dorsal planes. Regardless of the magnetic strength applied, imaging of the whole cranial cruciate ligament is difficult. Moreover, MRI allows the detection of the first signs of osteoarthritis, which were observed 4 and 6 weeks after rupture of the cranial cruciate ligament using high and low-field MRI. This also applies to lesions in the subchondral bone or a bone marrow which occurred in association with insufficiency of the stifle joint, and were mainly localized in the epiphysis of the femur and tibia. The present article provides a comparison of different examination protocols and images of damaged stifle structures, such as menisci, ligaments and bones of the stifle joint visualized with low-field and high-field magnetic resonance. Magnetic resonance arthrography is also discussed.

Magnetic resonance imaging for detection of late meniscal tears in dogs following tibial tuberosity advancement for treatment of cranial cruciate ligament injury

2014 ◽  
Vol 27 (02) ◽  
pp. 141-146 ◽  
Author(s):  
C. R. Lamb ◽  
M. S. Tivers ◽  
A. Li ◽  
F. Taylor-Brown
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Cruciate Ligament ◽  
Meniscal Tear ◽  
Ligament Injury ◽  
Meniscal Tears ◽  
Resonance Imaging ◽  
Mr Images ◽  
Cranial Cruciate Ligament

SummaryTo document the use of and to estimate the accuracy of magnetic resonance (MR) imaging for detection of late meniscal tears in dogs with cranial cruciate ligament injury treated with tibial tuberosity advancement (TTA).Medical records of dogs that had TTA followed by stifle MR imaging for suspected meniscal tear and subsequent arthrotomy were reviewed retrospectively. Magnetic resonance images were reviewed independently by an observer blinded to clinical information who classified menisci as torn, abnormal but intact, or normal. Magnetic resonance and surgical findings were compared.Eight stifles from large breed dogs were included. Six stifles had a medial meniscal tear identified in MR images and later confirmed surgically. In the remaining two stifles, the menisci appeared intact in MR images and no tear was identified at subsequent arthrotomy. Lateral menisci in all stifles appeared intact in MR images and were considered normal at surgery. Susceptibility artefacts associated with TTA implants were present in all images but did not adversely affect interpretation of intra-articular structures.Magnetic resonance imaging appears to be accurate for diagnosis of late meniscal tears. Artefacts associated with TTA implants did not prevent evaluation of critical intra-articular structures. Further investigation with MR imaging should be considered when late meniscal tear is suspected following TTA.

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