Biomedical subjects

J Brossmann

Publications and source records attributed to J Brossmann.

98 records · Page 6Linked to original sources

PubMed1994

Evaluation of patellar tracking in patients with suspected patellar malalignment: cine MR imaging vs arthroscopy.

OBJECTIVE: The purpose of this study was to compare results of motion-triggered cine MR imaging of active extension of the knee with arthroscopic findings in cases of suspected femoropatellar malalignment. SUBJECTS AND METHODS: Twenty patients with clinically proved or suspected patellar subluxation or dislocation were examined prospectively with motion-triggered cine MR imaging to analyze patellar tracking from 30 degrees of flexion to full extension during active extension of the knee. The patellar tracking pattern was evaluated by measuring the following: bisect offset and lateral patellar displacement to assess lateralization of the patella and the patellar tilt angle to assess tilting of patella. The slopes of the linear regression lines of the MR findings vs the knee angle position, representing the patellar tracking, and the position of the patella at 30 degrees and 0 degrees of flexion were correlated with a semiquantitative arthroscopic classification of patellar tracking that had four categories ranging from normal to highly abnormal. RESULTS: The results showed a significant correlation between the semiquantitative arthroscopic findings of patellar tracking and the slopes of the linear regression lines of the bisect offset, lateral patellar displacement, and patellar tilt angle, as measured with cine MR imaging (p < .01). The arthroscopic findings also correlated significantly with the position of the patella when the knee was extended (p < .01), but not with the knee flexed 30 degrees. CONCLUSION: We conclude that motion-triggered cine MR imaging of active extension of the knee enables the dynamic evaluation of patellar bracing and is therefore suitable for noninvasive analysis of patellar tracking.

Adult↗

PubMed1993

Patellar tracking patterns during active and passive knee extension: evaluation with motion-triggered cine MR imaging.

To evaluate the critical range of the patellofemoral joint motion from 30 degrees of knee flexion to full extension, motion-triggered cine magnetic resonance (MR) imaging was performed during active extension in 13 patients with confirmed patellar maltracking and 15 healthy subjects. Cine MR images were compared with static MR images obtained during incremental extension of the knee joint. To evaluate the patellar tracking pattern, the same imaging parameters (patellar tilt angle, bisect offset, and lateral patellar displacement) and section locations were used in the static and motion-triggered studies. Statistically significant differences between the passive and active knee motions were found in all three parameters in the group of patients and in the bisect offset in the control group. The comparison between patients and healthy subjects yielded statistically significant differences for all parameters in actively extended knees but not in passively extended knees. The results demonstrate the importance of dynamic patellar motion studies for diagnosis of patello-femoral maltracking.

Adolescent↗

PubMed1992

Motion-triggered cine MR imaging of active joint movement.

MRI cine studies of active physiological joint movement can provide additional functional information as a supplement to standard examinations. With the ankle joint as an example, it is shown that it is possible to measure kinematic MRI presentations of active joint movement. A pneumatic pressure transducer, a respiratory monitor, and an active differentiator transformed the skin muscle shifting of periodically performed joint movement to a pseudo-ECG, which finally triggered the MRI scanner as in cardiac cine MR imaging.

Ankle Joint↗

PubMed1992

[The femoropatellar gliding motion during active knee stretching. Imaging using motion-triggered MR tomography].

By means of motion-triggered MRT it has been possible for the first time to demonstrate movements in the patello-femoral joint by means of MRT. Patello-femoral movement was studied during active extension of the knee between 30 degrees flexion and complete extension. The knees of 5 normal females and 7 normal males were studied together with 2 women with recurrent lateral patellar luxation. In normal women there was an average 16 degrees (10 to 18 degrees), in men an average of 12 degrees (10 to 14 degrees) of lateralisation of the patella during complete extension of the knee. In 1 patient there was 10 degrees medial displacement of the patella before extension. In 2 knees with recurrent lateral subluxation there was a 20 and 24 degrees displacement of the patella.

Adolescent↗

PubMedDate not supplied

Perivascular inflammatory reaction after percutaneous placement of covered stents.

A 52-year-old woman with an extensive superficial femoral artery occlusion was treated with percutaneous transluminal angioplasty. Because of extensive dissections, two covered stents were placed percutaneously. The intervention was successful with respect to vessel patency, but local pain and fever developed 5 hr after the intervention. Swelling of the thigh occurred, but deep venous thrombosis was excluded. MRI revealed pronounced soft-tissue edema in the adductor canal that persisted for 4 weeks. The fever responded to antiinflammatory medication, but the pain remained for 4 weeks. The vessel was patent at the last follow-up, 8 weeks after graft placement. Soft-tissue edema after percutaneous placement of covered stents has been reported previously. The cause of the inflammatory reaction is unclear.

Aortic Dissection↗

PubMedDate not supplied

Prospective assessment of carotid bifurcation disease with spiral CT angiography in surface shaded display (SSD)-technique.

PURPOSE: To decide, whether spiral CT-angiography (CTA) in surface display (SSD)-technique is suitable for accurate quantification of carotid artery stenoses. MATERIAL AND METHODS: Forty-four patients (25 male, 19 females) with a total of 80 symptomatic carotid artery were studied prospectively with selective cerebral angiography and spiral CTA in SSD-technique. The degree of stenosis was determined according to the NASCET-study. RESULTS: Assessment of the degree of stenoses with CTA and angiography was the same in 36% of mild stenoses, in 64% of moderate stenoses, in 68% of severe stenoses, and in 95% of the occluded internal carotid arteries. Overall, CTA in SSD-technique showed equivalent results as selective cerebral angiography in 65% of all cases. CONCLUSION: Spiral CTA in SSD-technique is inferior to selective cerebral angiography. Calcified plaques, vessel opacification and thresholding influence the most grading of stenosis.

Adult↗

PubMedDate not supplied

Kinematic MRI of the knee using a specially designed positioning device.

To evaluate the benefits of a specially designed positioning device, kinematic MR studies of the patellofemoral joint and the cruciate ligaments were performed. Handling of the device and positioning of the patient's leg were easy and took only a few minutes. The positioning device was helpful for patients to guide their joint motion and to obtain sufficient image quality for kinematic MR studies of both cruciate ligaments and the patellar tracking.

Adult↗

PubMedDate not supplied

MR arthrography of the elbow: normal anatomy and diagnostic pitfalls.

PURPOSE: Our goal was to determine the normal MR arthrographic appearance of the elbow and to identify the potential diagnostic pitfalls of this technique. METHOD: MRI with intra-articularly administered gadopentetate dimeglumine was performed in seven elbow joints derived from cadavers. Coronal, sagittal, and axial SE T1-weighted images with fat suppression and coronal 3D SPGR images with fat suppression were obtained in each elbow. The elbows were then sectioned. RESULTS: This technique allowed depiction of the cartilaginous surfaces of the elbow joint as well as clear delineation of the inner surface of the collateral ligaments. Potential diagnostic pitfalls included fat pads projecting into the joint, synovial folds, and cartilaginous pseudoerosions. CONCLUSION: MR arthrography allows clear delineation of the intraarticular structures of the elbow. However, diagnostic pitfalls exist that increase the difficulty of interpreting MR arthrographic images.

Aged↗