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Keywords:
Image verification, Normal variants, Imaging sequences, Diagnostic procedure, Image manipulation / Reconstruction, MR, Musculoskeletal joint, Extremities, Trauma
Authors:
H. Yoshioka1, J. Sutherland1, W. Wu2, T. Nozaki1, Y. Kaneko1, H. Yu1, G. Rafijah1, D. Hitt3; 1Orange, CA/US, 2Irvine, CA/US, 3Cleveland, OH/US
DOI:
10.1594/ecr2015/C-0123
Results
In the UCL analysis,
two cases out of 34 subjects were excluded from the analysis because of one for juvenile rheumatoid arthritis (JRA) and the other for prior severe fracture.
The UCL was not identified in 2 subjects on either isotropic 3D or conventional 2D images.
One was a healthy volunteer and the other was a patient with a prior history of ulnar styloid fracture.
Table 1 shows the result of classification of the UCL attachment.
After using oblique coronal MPR images,
eight cases (25%) were changed in classification.
3 cases were classified into either type 1 or 2 from type 0 referred with reference to MPR.
Type 1a (narrow attachment to tip of the ulnar styloid process) was the most common type (Figure 3).
The UCL type of the patients demonstrated relatively equal distribution with more type 2 cases (attachment to the medial base of the ulnar styloid) than that of the volunteers.
Fibrous connection of the UCL to the triangular ligament of the TFCC was identified in 10 cases (33.3%) with high-resolution MRI after excluding 2 cases of type 0. Figure 4 shows the semi-quantitative scoring of delineation of the UCL with 3D and 2D sequences.
There was no statistical difference between these two sequences.
In the RCL analysis,
one out of 34 subjects was excluded from the analysis because of JRA.
The radioscaphoid and scaphotrapezium ligaments were identified in all subjects on both isotropic 3D and conventional 2D images.
Table 2 shows the result of classification of the RCL attachment.
Type 1a (separated radioscaphoid and scaphotrapezium ligaments with narrow scaphoid attachment) was the most common type (Figure 5).
Type 1 attachment of the RCL was more common on both volunteers and patients,
and demonstrated 64% of cases (Table 2).
The semi-quantitative scoring of delineation of the RCL with 3D and 2D sequences revealed no statistical difference between these two sequences (Figure 4).