scholarly journals Extracting Information about the Rotator Cuff from Magnetic Resonance Images Using Deterministic and Random Techniques

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
F. A. De Los Ríos ◽  
M. Paluszny
Keyword(s):  
Magnetic Resonance ◽  
Rotator Cuff ◽  
Computing Time ◽  
Computational Cost ◽  
Supraspinatus Tendon ◽  
Magnetic Resonance Images ◽  
Fixed Number ◽  
Partial Tears ◽  
Interpolation Technique ◽  
Trilinear Interpolation

We consider some methods to extract information about the rotator cuff based on magnetic resonance images; the study aims to define an alternative method of display that might facilitate the detection of partial tears in the supraspinatus tendon. Specifically, we are going to use families of ellipsoidal triangular patches to cover the humerus head near the affected area. These patches are going to be textured and displayed with the information of the magnetic resonance images using the trilinear interpolation technique. For the generation of points to texture each patch, we propose a new method that guarantees the uniform distribution of its points using a random statistical method. Its computational cost, defined as the average computing time to generate a fixed number of points, is significantly lower as compared with deterministic and other standard statistical techniques.

scholarly journals Supraspinatus-to-Glenoid Contact Occurs During Standardized Overhead Reaching Motion

2021 ◽  
Vol 9 (10) ◽  
pp. 232596712110369
Author(s):  
Gaura Saini ◽  
Rebekah L. Lawrence ◽  
Justin L. Staker ◽  
Jonathan P. Braman ◽  
Paula M. Ludewig
Keyword(s):  
Rotator Cuff ◽  
Pearson Correlation ◽  
Supraspinatus Tendon ◽  
Contact Angles ◽  
Magnetic Resonance Images ◽  
Rotator Cuff Tears ◽  
Internal Impingement ◽  
Glenoid Morphology ◽  
Minimum Distances ◽  
The Relationship

Background: Rotator cuff tears may result from repeated mechanical deformation of the cuff tendons, and internal impingement of the supraspinatus tendon against the glenoid is one such proposed mechanism of deformation. Purpose: To (1) describe the changing proximity of the supraspinatus tendon to the glenoid during a simulated overhead reaching task and (2) determine the relationship between scapular morphology and this proximity. Additionally, the patterns of supraspinatus-to-glenoid proximity were compared with previously described patterns of supraspinatus-to-coracoacromial arch proximity. Study Design: Descriptive laboratory study. Methods: Shoulder models were created from magnetic resonance images of 20 participants. Standardized kinematics were imposed on the models to simulate functional reaching, and the minimum distances between the supraspinatus tendon and the glenoid and the supraspinatus footprint and the glenoid were calculated every 5° between 0° and 150° of humerothoracic elevation. The angle at which contact between the supraspinatus and the glenoid occurred was documented. Additionally, the relationship between glenoid morphology (version and inclination) and the contact angle was evaluated. Descriptive statistics were calculated for the minimum distances, and glenoid morphology was assessed using Pearson correlation coefficients and simple linear regressions. Results: The minimum distances between the tendon and the glenoid and between the footprint and the glenoid decreased as elevation increased. Contact between the tendon and the glenoid occurred in all participant models at a mean elevation of 123° ± 10°. Contact between the footprint and the glenoid occurred in 13 of 20 models at a mean of 139° ± 10°. Less glenoid retroversion was associated with lower tendon-to-glenoid contact angles ( r = –0.76; R 2 = 0.58; P < .01). Conclusion: This study found that the supraspinatus tendon progressively approximated the glenoid during simulated overhead reaching. Additionally, all participant models eventually made contact with the glenoid by 150° of humerothoracic elevation, although anatomic factors influenced the precise angle at which contact occurred. Clinical Relevance: Contact between the supraspinatus and the glenoid may occur frequently within the range of elevation required for overhead activities. Therefore, internal impingement may be a prevalent mechanism for rotator cuff deformation that could contribute to cuff pathology.

scholarly journals Magnetic resonance imaging reproducibility for rotator cuff partial tears in patients up to 60 years

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
João Alberto Yazigi Junior ◽  
Fábio Anauate Nicolao ◽  
Nicola Archetti Netto ◽  
Fabio Teruo Matsunaga ◽  
Jéssica Hae Lim Lee ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Rotator Cuff ◽  
Resonance Imaging ◽  
Partial Tears

Evaluation of post-exercise magnetic resonance images of the rotator cuff

1996 ◽  
Vol 25 (8) ◽  
pp. 739-741 ◽  
Author(s):  
Philip M. Cahoy ◽  
J. F. Orwin ◽  
Michael J. Tuite
Keyword(s):  
Magnetic Resonance ◽  
Rotator Cuff ◽  
Magnetic Resonance Images ◽  
Post Exercise

Ultrasonographic and magnetic resonance images of rotator cuff lesions compared with arthroscopy or open surgery findings

2001 ◽  
Vol 10 (5) ◽  
pp. 410-415 ◽  
Author(s):  
Carmen Martín-Hervás ◽  
Julia Romero ◽  
Ana Navas-Acién ◽  
Juan José Reboiras ◽  
Luis Munuera
Keyword(s):  
Magnetic Resonance ◽  
Rotator Cuff ◽  
Open Surgery ◽  
Magnetic Resonance Images ◽  
Rotator Cuff Lesions

scholarly journals Effect of the acromial inferolateral tilt on subacromial impingement syndrome: a retrospective magnetic resonance imaging assessment

2020 ◽  
Vol 53 (6) ◽  
pp. 366-374
Author(s):  
André Vaz ◽  
Camila Pietroski Reifegerste ◽  
Cesar Rodrigo Trippia ◽  
Lucas Savaris Linhares ◽  
Fábio Bordin Trindade ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Interobserver Agreement ◽  
Tendon Rupture ◽  
Characteristic Curve ◽  
Supraspinatus Tendon ◽  
Magnetic Resonance Images ◽  
Impingement Syndrome ◽  
Subacromial Impingement Syndrome ◽  
Subacromial Impingement ◽  
Magnetic Resonance Imaging Assessment

Abstract Objective: To evaluate the effect of acromial inferolateral tilt on subacromial impingement syndrome. Materials and Methods: The acromial inferolateral tilt was retrospectively quantified by two researchers on 346 shoulder magnetic resonance images using the glenoacromial (between the inferior proximal acromial surface and the glenoidal face) and acromioclavicular (between the axis of the proximal acromion and distal clavicle) angles. Results: The glenoacromial angle was associated with subacromial impingement syndrome (p < 0.001) and complete supraspinatus tendon rupture (p < 0.001), and the acromioclavicular angle was associated with partial or complete supraspinatus tendon rupture (p = 0.003). The area under the receiver operating characteristic curve (AUC), best cut-off angle, and odds ratio (OR) of the glenoacromial angle for impingement syndrome were 0.579 (95% confidence interval [CI]: 0.508-0.649; p = 0.032), 72°, and 2.1 (95% CI: 1.136-4.053), respectively. For complete supraspinatus tendon rupture, the AUC, best cut-off angle, and OR of the glenoacromial angle were 0.731 (95% CI: 0.626-0.837; p = 0.001), 69°, and 8.496 (95% CI: 2.883-28.33), respectively. For partial or complete supraspinatus tendon rupture, the AUC, best cut-off angle and OR of the acromioclavicular angle were 0.617 (95% CI: 0.539-0.694; p = 0.002), 17°, and 3.288 (95% CI: 1.886-5.768), respectively. Interobserver agreement found for the glenoacromial and acromioclavicular angles were 0.737 (95% CI: 0.676-0.787; p < 0.001) and 0.507 (95% CI: 0.391-0.601; p = 0.001), respectively. Conclusion: Inferolateral acromial tilt may have some impact on subacromial impingement syndrome; however, the best quantification method identified (glenoacromial angle) showed a moderate interobserver agreement and a fair performance to assess the risk of complete supraspinatus tendon rupture.

scholarly journals Supraspinatus tendon reconstruction using open infraspinatus tendon shift and autologous biceps tendon interposition grafts

2021 ◽  
Author(s):  
Jörg Panzert ◽  
Pierre Hepp ◽  
Mareike Hellfritzsch ◽  
Almut Sasse ◽  
Jan Theopold
Keyword(s):  
Magnetic Resonance ◽  
Rotator Cuff ◽  
Constant Score ◽  
Biceps Tendon ◽  
Supraspinatus Tendon ◽  
Rotator Cuff Tears ◽  
Functional Improvement ◽  
Complete Closure ◽  
Tendon Interposition ◽  
Infraspinatus Tendon

Abstract Introduction Inferior tendon quality, wide retraction, and tendon stumps that cannot be mobilized define the limits of what is technically feasible for open and arthroscopic rotator cuff reconstruction. The aim of this study was to develop a procedure that enables the open reconstruction of otherwise non-reconstructable rotator cuff tears. Methods From 2014 to 2018, 23 operations were performed on 21 patients (mean age 63) using open procedure involving separating the infraspinatus tendon from the point of insertion on the greater tubercle and mobilizing it proximally and ventrally into the defective area. Any remaining defects were augmented using an autologous biceps tendon interposition graft. This augmentation was performed to achieve complete closure of the defect. Furthermore, the augmentation of the rupture zone was intended to strengthen the tendon stumps of the SSP and ISP to better neutralize the initial tensile forces. After a postoperative period of 12 months–4 years, clinical examination and functional tests were carried out, the Constant score was determined, and radiological and magnetic resonance imaging check-up examinations were performed. Results The technique resulted in a low-tension closure of an otherwise “non-repairable” superior rotator cuff defect. All patients experienced a significant functional improvement, a reduction in pain, and an increase in muscle strength. An improvement in the Constant score from 48 points preoperatively to 87 points postoperatively (p < 0.05) was observed. In 19 patients (90%), the magnetic resonance image showed an intact reconstruction. Re-rupture was seen in three patients (14%). Conclusion The surgical procedure using infraspinatus tendon shift and autologous biceps tendon interposition grafts resulted in the successful reconstruction of otherwise non-reconstructable massive rotator cuff lesions. The complete closure of the defect was observed.

Sign in / Sign up

Export Citation Format

Share Document