Musculoskeletal MR: knee

Stäbler, Axel; Gläser, Christian; Reiser, Maximilian

doi:10.1007/s003300050039

Cited by 50 publications

(33 citation statements)

References 87 publications

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“…There are not many reported studies to evaluate all the MR imaging signs of meniscal bucket handle tears in relation to arthroscopic findings. A set of six MR imaging signs have been described for meniscal bucket handle tears [1,4,5,7,11,[14][15][16][17]. The present study tries to make a correlation between the type of meniscal bucket handle tear according to Dandy arthroscopic classification and the proposed and well-established MR imaging signs of meniscal bucket handle tears that we found in the literature [1,2,4,5,7,11,[15][16][17].…”

Section: Discussionmentioning

confidence: 91%

Meniscal bucket handle tears: a retrospective study of arthroscopy and the relation to MRI

Ververidis

Verettas

Kazakos

et al. 2005

Knee Surg Sports Traumatol Arthrosc

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In this study, we aim to evaluate the arthroscopic findings of meniscal bucket handle tears and to correlate them with the proposed MR imaging signs of meniscal bucket handle tears suggested in the literature. Thirty-six patients who had a diagnosis of bucket handle tear in arthroscopy, in either medial or lateral meniscus, were included in our study (32 males and 4 females). Meniscal tears were evaluated in arthroscopy according to Dandy's classification. The MRIs were retrospectively analyzed regarding the following findings: absence of bow tie sign, presence of double posterior cruciate ligament (PCL) sign, double anterior horn sign, flipped meniscus sign, disproportional posterior horn sign, and fragment within the intercondylar region. Locked types I and II fragment of medial meniscus and half-length, whole-width and whole length-half-width fragment of lateral meniscus in arthroscopy were basically correlated with fragment within the intercondylar notch and absent bow tie signs in MRI. We did not find the double PCL sign in any of the patients with a lateral meniscal bucket handle tear. The most common signs in MR images of meniscal bucket handle tears were the fragment in the notch sign and the absent bow tie sign. They were observed with equal frequency of 88.8%. The presence of double PCL sign, double anterior horn sign, flipped meniscus sign, disproportional posterior horn sign were less common (41.66, 33, 25, and 27.7%, respectively). We conclude that the presence of at least two of the six MRI signs should be regarded as highly suggestive for bucket handle tears of menisci.

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Section: Discussionmentioning

confidence: 91%

Meniscal bucket handle tears: a retrospective study of arthroscopy and the relation to MRI

Ververidis

Verettas

Kazakos

et al. 2005

Knee Surg Sports Traumatol Arthrosc

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“…Proton-density (PD) turbo spin-echo sequences with and without fat-saturation have shown to be accurate for highresolution imaging of the knee [22]. The choice of echo train length (ETL) is a key determinant of time savings in fast (turbo) spin-echo sequences.…”

Section: Discussionmentioning

confidence: 99%

“…Pathologies of bony structures included signal alterations representing an edema pattern (bone bruiser). An occult fracture was diagnosed if these bone bruisers were accompanied by linear signal alterations resembling a fracture line [22].…”

Section: Image Analysismentioning

confidence: 99%

Fast magnetic resonance imaging of the knee using a parallel acquisition technique (mSENSE): a prospective performance evaluation

et al. 2006

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The performance of a magnetic resonance (MR) imaging strategy that uses multiple receiver coil elements and integrated parallel imaging techniques (iPAT) in traumatic and degenerative disorders of the knee and to compare this technique with a standard MR imaging protocol was evaluated. Ninety patients with suspected internal derangements of the knee joint prospectively underwent MR imaging at 1.5 T. For signal detection, a 6-channel array coil was used. All patients were investigated with a standard imaging protocol consisting of different turbo spin-echo sequences proton density (PD), T2-weighted turbo spin echo (TSE) with and without fat suppression) in three imaging planes. All sequences were repeated with an integrated parallel acquisition technique (iPAT) using the modified sensitivity encoding (mSENSE) algorithm with an acceleration factor of 2. Two radiologists independently evaluated and scored all images with regard to overall image quality, artefacts and pathologic findings. Agreement of the parallel ratings between readers and imaging techniques, respectively, was evaluated by means of pairwise kappa coefficients that were stratified for the area of evaluation. Agreement between the parallel readers for both the iPAT imaging and the conventional technique, respectively, as well as between imaging techniques was found encouraging with inter-observer kappa values ranging between 0.78 and 0.98 for both imaging techniques, and the inter-method kappa values ranging between 0.88 and 1.00 for both clinical readers. All pathological findings (e.g. occult fractures, meniscal and cruciate ligament tears, torn and interpositioned Hoffa's cleft, cartilage damage) were detected by both techniques with comparable performance. The use of iPAT lead to a 48% reduction of acquisition time compared with standard technique. Parallel imaging using mSENSE proved to be an efficient and economic tool for fast musculoskeletal MR imaging of the knee joint with comparable diagnostic performance to conventional MR imaging.

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“…The determination of sagittal image was as follows: Firstly, axial images of the femoral chondyle in which ACL inserts into the femur were obtained; then the parasagittal direction 10°oblique from the midsagittal direction of the knee joint, which was considered to be parallel to the ACL, was determined. If the ACL was not depicted as a continuous low-intensity band, we changed the parasagittal angle to a maximum of 20°and tried again [12,13,14]. Next the determination of angled coronal image was coronal image, parallel to the ACL.Gd-DTPA (0.2 mmol/kg.)…”

Section: Methodsmentioning

confidence: 99%

The value and limitation of gadopentetate-enhanced magnetic resonance imaging in detecting the condition of anterior cruciate ligament in rheumatoid knee: comparative study with histology

Fujii¹,

Tomita

Nakanishi

et al. 2003

Eur Radiol

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The aim of this study was to elucidate the utility and limitation of gadopentetate (Gd)-enhanced MRI as a method for evaluating the anterior cruciate ligament (ACL) in the rheumatoid arthritis (RA) knee, using both surgical macro findings and histological findings to ascertain the pathological condition of the affected knee. Thirty-six knees of 25 RA patients were studied in this study. Four imaging protocols were employed: protocol A, T1-weighted and T2-weighted sagittal images; protocol B, T1-weighted sagittal image, after infusion of Gd-DTPA (0.2 mmol/kg, i.v.); protocol C, T1-weighted angled coronal image, parallel to the ACL; and protocol D, T1-weighted angled coronal image, parallel to the ACL, after infusion of Gd-DTPA. Sagittal image was determined as previously described. Angle coronal image was newly determined as coronal image parallel to the ACL. Surgical and MRI findings of the ACL were classified into four types: Type I (normal group) indicated that the thickness of the ACL was almost normal, adequate tension was maintained (surgical findings),and the ACL had thick and a more complex appearance with a homogeneous signal intensity and well-defined borders (MRI findings). Type II (degenerated group): the ACL had degenerated and tension was reduced (surgical findings), and the ACL had thin and a more complex appearance with a less homogeneous signal intensity and less well-defined borders. This appearance was more evident on Type II than Type I (MRI findings). Type III (ruptured group): the parenchyma of the ACL remained but lacked continuity (surgical findings), and the ACL appeared as partial lack of low signal intensity (MRI findings). Type IV (absent group): the parenchyma of the ACL was practically absent (surgical findings), and the ACL appeared as complete lack of signal low signal intensity (MRI findings). The concordance rate between surgical and MRI findings was investigated. Moreover, we investigated the extent to which histological changes of the ACL could be discriminated using MRI. In RA knees, the overall concordance rate between surgical and MRI findings was 41.7% under imaging protocol A. The overall rate improved up to 69.4% under imaging protocol B. But the overall rate dropped to 36.1% under imaging protocol C. The overall rate improved up to 83.3% under imaging protocol D. Especially, significant differences between imaging protocols A and B ( p<0.05), and imaging protocols C and D ( p<0.01), with respect to ACL degenerated group, were recognized. But significant differences between imaging protocols A and C, and imaging protocols B and D, with respect to ACL degenerated group, were not recognized. The concordance rate between histological and MRI findings was 41.7% in ACL normal group, and 61.5% in ACL degenerated group. The concordance rate between surgical and MRI findings was 100% in ACL normal group, and 78.9% in ACL degenerated group. There was a significant difference in the concordance rates between histological, surgical, and MRI findings in normal group ( p<0.05). The res...

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Musculoskeletal MR: knee

Cited by 50 publications

References 87 publications

Meniscal bucket handle tears: a retrospective study of arthroscopy and the relation to MRI

Meniscal bucket handle tears: a retrospective study of arthroscopy and the relation to MRI

Fast magnetic resonance imaging of the knee using a parallel acquisition technique (mSENSE): a prospective performance evaluation

The value and limitation of gadopentetate-enhanced magnetic resonance imaging in detecting the condition of anterior cruciate ligament in rheumatoid knee: comparative study with histology

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