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Biomedical subjects

D S Uri

Publications and source records attributed to D S Uri.

10 recordsLinked to original sources
PubMed2000

Evaluation of bone contusions with fat-saturated fast spin-echo proton-density magnetic resonance imaging.

OBJECTIVE: To evaluate the efficacy of fast spin-echo proton-density magnetic resonance imaging (MRI) with fat saturation sequences in the evaluation of bone contusions at the knee. METHODS: Analysis of 46 consecutive knee MRI examinations performed on patients referred from a sports medicine clinic after knee trauma. All examinations included coronal fast spin-echo proton-density fat saturation, fast spin-echo proton-density and fast spin-echo T2-weighted sequences. All 3 coronal sequences were blindly reviewed independently of each other by 3 experienced musculoskeletal radiologists to identify and grade bone contusions. RESULTS: Thirty-five bone contusions were identified in 24 patients. All bone contusions were identified on fast spin-echo proton-density fat saturation sequences, which was significantly greater than the percentage identified on either fast spin-echo T2-weighted sequences (21/35, 60%, p < 0.001) or fast spin-echo proton-density sequences (10/35, 29%, p < 0.001). Fourteen (40%) of the contusions were identified only on the fast spin-echo proton-density fat saturation sequences. The average grade of contusion for all 35 examinations was also significantly higher on the fast spin-echo proton-density fat saturation sequences than on the fast spin-echo proton-density and fast spin-echo T2-weighted sequences (p < 0.05). CONCLUSION: Fast spin-echo proton-density fat saturation sequences are more sensitive in the detection of bone contusions than fast spin-echo proton-density and fast spin-echo T2-weighted sequences. Assessment of other structures in the knee with fast spin-echo proton-density fat saturation MRI provides good spatial resolution and adequate T2-weighted information. It may have advantages over the more heavily T2-weighted fast spin-echo T2 fat saturation and inversion recovery sequences.

Adult↗
PubMed1997

Os acromiale: evaluation of markers for identification on sagittal and coronal oblique MR images.

An os acromiale is a developmental abnormality of ossification involving the anterior acromion which may contribute to impingement and rotator cuff disease. When axial MR sections do not include the acromioclavicular joint, the diagnosis of this often subtle abnormality will rest on its recognition on oblique and coronal and sagittal images where it mimics the acromioclavicular joint. The identification of this anomaly is important as it frequently alters the type of surgical procedure utilized in symptomatic patients. We evaluate several imaging features which may be used to diagnose an os acromiale in these cases.

Acromioclavicular Joint↗
PubMed1997

MR imaging of shoulder impingement and rotator cuff disease.

A number of imaging modalities, such as conventional radiography, arthrography, ultrasonography, and MR imaging, can be used in the evaluation of shoulder pain related to impingement, tendinosis, and rotator cuff tear. Of these techniques, only MR imaging provides anatomic information coupled with superior soft-tissue contrast. MR imaging of the shoulder effectively demonstrates a variety of morphologic abnormalities that may be associated with tendon degeneration. Rotator cuff tears are also well depicted and may be further characterized with regard to tendon involvement, degree of retraction, and secondary muscular atrophy.

Humans↗
PubMed1996

Muscle impingement: MR imaging of a painful complication of osteochondromas.

The purpose of this study was to describe the magnetic resonance (MR) appearance of a newly recognized complication of osteochondromas. Two patients presented with pain and swelling over known osteochondromas. Plain radiographic studies were unrevealing. MR examinations were obtained to characterize the exostoses further and evaluate areas of palpable fullness. Increased signal was present in the muscles on T2-weighted images, which correlated with physical findings and was believed to represent muscle injury due to the osteochondroma. Pain and fullness may result from a number of osteochondroma-related complications, the most worrisome of which is malignant degeneration. Muscular impingement and injury should be considered in the differential diagnosis of pain and swelling in the region of an exostosis. MR imaging allows distinction of this entity, which may be radiographically occult and confused clinically with fracture, bursitis, or malignant degeneration.

Adult↗
PubMed1996

Imaging of arthropathies. Crystal disease.

The crystalline arthropathies are a heterogeneous group of biochemical disorders that share the common feature of crystal deposition in and around joints. These metabolic derangements result in a variety of clinical symptoms, radiographic signs, and pathologic abnormalities. The diagnosis of these disorders usually is straightforward when typical articular symptoms are present and characteristic radiographs or joint crystals are obtained. Current concepts regarding crystal-associated arthropathies are reviewed along with a discussion of their often distinctive radiographic appearances.

Arthrography↗
PubMed1995

Update in shoulder magnetic resonance imaging.

The shoulder is capable of the largest range motion of any articulation in the human body. Because it is inherently unstable, the glenohumeral joint is dependent on the support given by surrounding muscular, ligamentous, and tendonous structures. A variety of disorders may involve these structural supports and lead to shoulder pain and dysfunction. Refinements in magnetic resonance (MR) imaging techniques have allowed improved characterization of these abnormalities and may permit earlier and more specific diagnoses in patients with shoulder pain. Theories as to the pathogenesis of rotator cuff disease include intrinsic and extrinsic impingement as well as overload tendinosis. MR is useful in the evaluation of rotator cuff impingement and tears. The classification and MR assessment of glenohumeral instability has recently received increased attention yet remains an area of difficulty. MR arthrography has been used with some success in the evaluation of instability demonstrating improved diagnostic sensitivities and specificities when compared with conventional MR. Relatively little attention has been paid to MR evaluation of the shoulder after surgery. Micrometallic artifact, distortion of soft-tissue planes, and persistent signal abnormalities within rotator cuff and capsulolabral structures may hinder assessment of recurrent tear or instability in the postoperative patient.

Humans↗