Abstract:
PURPOSE:Magnetic resonance imaging (MRI) is one of the most widely used noninvasive diagnostic modalities for musculoskeletal evaluation. We conducted a retrospective study to determine whether MRI of the hip joint abductor and external rotator muscles yields reproducible findings in patients after total hip arthroplasty (THA). MATERIALS AND METHODS:MR images were obtained 12 months after THA in 10 patients and were analyzed by two independent, blinded observers. The images were analyzed on workstations with three-dimensional analysis capabilities. The readers evaluated the gluteus medius, gluteus minimus, and obturator externus muscles on the nonoperated side (NOS) and the THA side. For each of the three muscles, the readers analyzed the cross-sectional area, cross-sectional signal intensity, intensity in a region of interest (ROI), and volume on both sides. RESULTS:Unlike intraobserver variability, interobserver variability showed significant differences between the measurements for some abductor and external rotator muscles, especially for volume (p<0.001-0.02) and cross-sectional area (p<0.001-0.05) analysis of the gluteus medius and minimus muscles on the THA side but also on the NOS. There were no differences in signal intensity in the ROI (p=0.29-0.83). The coefficients of variation (CoV) of all 4 parameters quantified were lower on the NOS (average, 5.9%) than on the THA side (average, 7.3%). Analysis of the gluteus minimus muscle volume showed both higher intraobserver (18.8%) and interobserver (13.9%) variability on the THA side. CONCLUSION:MRI is an accurate and reliable test for evaluation of soft tissue structures in patients who have undergone THA. MRI evaluation of abductor muscles yields reproducible results on the THA side and on the NOS. Prosthesis artifacts limit evaluation of the gluteus minimus muscle on the THA side and cannot be recommended. Since interobserver variability was always higher than intraobserver variability, follow-up examinations should ideally be performed by the same reader in order to obtain clinically meaningful results.
journal_name
Eur J Radioljournal_title
European journal of radiologyauthors
Springer I,Müller M,Hamm B,Dewey Mdoi
10.1016/j.ejrad.2011.01.113subject
Has Abstractpub_date
2012-05-01 00:00:00pages
928-33issue
5eissn
0720-048Xissn
1872-7727pii
S0720-048X(11)00172-0journal_volume
81pub_type
临床试验,杂志文章abstract:OBJECTIVES:To estimate the additional value of an increased flip angle of 35° in late phase Gd-EOB-DTPA-enhanced magnetic resonance cholangiography, as compared to T2w-MRCP. METHODS:40 adult patients underwent Gd-EOB-DTPA enhanced MRI of the liver including a T2-weighted 3D TSE MRCP (T2w-MRCP) as well as a late phase ...
journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
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journal_title:European journal of radiology
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pub_type: 杂志文章,随机对照试验
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journal_title:European journal of radiology
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pub_type: 杂志文章,评审
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journal_title:European journal of radiology
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journal_title:European journal of radiology
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journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
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doi:
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journal_title:European journal of radiology
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abstract:PURPOSE:To investigate the potential of ESWAN in differentiating borderline epithelial ovarian tumors (BEOTs) from malignant epithelial ovarian tumors (MEOTs). METHOD:Thirty-four patients with 37 lesions were enrolled, including 14 BEOTs and 23 MEOTs. The magnitude, phase, R2* and T2* maps were analyzed by two observe...
journal_title:European journal of radiology
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pub_type: 杂志文章
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