A histoanatomical study of the fiber bundle forming the ‘Comma Sign,’ a critical marker of the torn edge of the subscapularis tendon

2021 ◽  
Author(s):  
Ryuzo Arai ◽  
Yoshihiro Hagiwara ◽  
Yoshifumi Saijo ◽  
Shuichi Matsuda
Keyword(s):  
Fiber Bundle ◽  
Subscapularis Tendon ◽  
Comma Sign

Elasticity evaluation of the fiber bundle forming the comma sign with ultrasound microscopy

2021 ◽  
Vol 30 (4) ◽  
pp. e183
Author(s):  
Ryuzo Arai ◽  
Yoshihiro Hagiwara ◽  
Yoshifumi Saijo ◽  
Shuichi Matsuda
Keyword(s):  
Fiber Bundle ◽  
Ultrasound Microscopy ◽  
Comma Sign

scholarly journals A “Comma Sign”–Directed Subscapularis Repair in Anterosuperior Rotator Cuff Tears Yields Biomechanical Advantages in a Cadaveric Model

2021 ◽  
pp. 036354652110315
Author(s):  
Michael Hackl ◽  
Eduard Buess ◽  
Sandra Kammerlohr ◽  
Julia Nacov ◽  
Manfred Staat ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Failure Load ◽  
Primary Stability ◽  
Rotator Cuff Tears ◽  
Subscapularis Tendon ◽  
Gap Formation ◽  
Single Row ◽  
Ultimate Failure Load ◽  
Ultimate Failure ◽  
Comma Sign

Background: Additional stabilization of the “comma sign” in anterosuperior rotator cuff repair has been proposed to provide biomechanical benefits regarding stability of the repair. Purpose: This in vitro investigation aimed to investigate the influence of a comma sign–directed reconstruction technique for anterosuperior rotator cuff tears on the primary stability of the subscapularis tendon repair. Study Design: Controlled laboratory study. Methods: A total of 18 fresh-frozen cadaveric shoulders were used in this study. Anterosuperior rotator cuff tears (complete full-thickness tear of the supraspinatus and subscapularis tendons) were created, and supraspinatus repair was performed with a standard suture bridge technique. The subscapularis was repaired with either a (1) single-row or (2) comma sign technique. A high-resolution 3D camera system was used to analyze 3-mm and 5-mm gap formation at the subscapularis tendon-bone interface upon incremental cyclic loading. Moreover, the ultimate failure load of the repair was recorded. A Mann-Whitney test was used to assess significant differences between the 2 groups. Results: The comma sign repair withstood significantly more loading cycles than the single-row repair until 3-mm and 5-mm gap formation occurred ( P≤ .047). The ultimate failure load did not reveal any significant differences when the 2 techniques were compared ( P = .596). Conclusion: The results of this study show that additional stabilization of the comma sign enhanced the primary stability of subscapularis tendon repair in anterosuperior rotator cuff tears. Although this stabilization did not seem to influence the ultimate failure load, it effectively decreased the micromotion at the tendon-bone interface during cyclic loading. Clinical Relevance: The proposed technique for stabilization of the comma sign has shown superior biomechanical properties in comparison with a single-row repair and might thus improve tendon healing. Further clinical research will be necessary to determine its influence on the functional outcome.

The comma sign: An arthroscopic guide to the torn subscapularis tendon

2003 ◽  
Vol 19 (3) ◽  
pp. 334-337 ◽  
Author(s):  
Ian K.Y. Lo ◽  
Stephen S. Burkhart
Keyword(s):  
Subscapularis Tendon ◽  
Comma Sign

Effect of Shape of Fiber Bundle on Damage Development of Woven Fabric Composities

2006 ◽  
Vol 55 (2) ◽  
pp. 224-229 ◽  
Author(s):  
Takao OTA ◽  
Hikaru YOSHIZUMI ◽  
Hirokazu TSUCHIHASHI ◽  
Takashi MATSUOKA ◽  
Kazuhiko SAKAGUCHI
Keyword(s):  
Fiber Bundle ◽  
Woven Fabric ◽  
Damage Development

Formation of Fiber-bundle/Matrix Interlayer in Carbon/Carbon Composites

2011 ◽  
Vol 26 (12) ◽  
pp. 1309-1313 ◽  
Author(s):  
Jie-Hui JING ◽  
Yu-Dong HUANG ◽  
Li LIU ◽  
Zai-Xing JIANG ◽  
Bo JIANG
Keyword(s):  
Fiber Bundle ◽  
Carbon Composites

Registration of 10 Upland Cotton Germplasm Lines Having Improved Fiber Bundle Strength

Crop Science ◽  
1990 ◽  
Vol 30 (6) ◽  
pp. 1373-1374 ◽  
Author(s):  
C. Wayne Smith ◽  
G. A. Niles
Keyword(s):  
Fiber Bundle ◽  
Upland Cotton

Geocartographic thinking in modern science

2020 ◽  
Vol 961 (7) ◽  
pp. 27-36
Author(s):  
A.K. Cherkashin
Keyword(s):  
Differential Geometry ◽  
Fiber Bundle ◽  
Modern Science ◽  
The State ◽  
Theory Of Knowledge ◽  
Knowledge Map ◽  
Knowledge Based ◽  
Geographical Environment ◽  
New Knowledge ◽  
Thematic Layer

The purpose of the study is to show how the features of geocartographic way of thinking are manifested in the meta-theory of knowledge based on mathematical formalisms. General cartographic concepts and regularities are considered in the view of metatheoretic analysis using cognitive procedures of fiber bundle from differential geometry. On levels of metainformation generalization, the geocartographic metatheoretic approach to the study of reality is higher than the system-theoretical one. It regulates the type of equations, models, and methods of each intertheory expressed in its own system terms. There is a balance between the state of any system and its geographical environment; therefore the observed phenomena are only explained theoretically in a metatheoretic projection on the corresponding system-thematic layer of the knowledge map. Metatheoretic research enables passing from the systematization of already known patterns to the formation of new knowledge through the scientific stratification of reality. General methods of metatheoretic analysis are mathematically distinguished

Illuminance distribution produced by a fiber bundle

1984 ◽  
Vol 23 (17) ◽  
pp. 2859 ◽  
Author(s):  
Shojiro Nemoto
Keyword(s):  
Fiber Bundle

Enhanced Electrochemiluminescence in the Microwell Bipolar Electrode Array Prepared with an Optical Fiber Bundle

2021 ◽  
Author(s):  
Haidong Li ◽  
Tian Zhang ◽  
Han Zhou ◽  
Zhicheng Zhang ◽  
Miaoxia Liu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bundle ◽  
Electrode Array ◽  
Bipolar Electrode ◽  
Optical Fiber Bundle
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