Degenerated coracoacromial ligament in shoulders with rotator cuff tears shows higher elastic modulus: measurement with scanning acoustic microscopy

Kijima, Hiroshi; Minagawa, Hiroshi; Saijo, Yoshifumi; Sano, Hirotaka; Tomioka, Tatsuru; Yamamoto, Nobuyuki; Shimada, Yasuhiro; Okada, Kyoji; Itoi, Eiji

doi:10.1007/s00776-008-1283-x

Cited by 14 publications

(13 citation statements)

References 20 publications

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“…The coracoacromial ligament is suggested to soften after a rotator cuff tore, because ligaments of shoulders with rotator cuff tears are softer than ligaments of agematched shoulders with a normal cuff. Previous histological study also suggested that the coracoacromial ligament was softened when its fiber structure collapsed as degeneration progressed with the rotator cuff tear [5]. And the present study supports that previous report, in vivo.…”

Section: Discussionsupporting

confidence: 91%

“…Same previous study has also shown that the ligaments in shoulders with rotator cuff tears have a lower elastic modulus H. KIJIMA ET AL. 2 [5]. From this result, we can hypothesize that the coracoacromial ligament softens after the onset of rotator cuff tear, and that the prevalence of shoulder pain decreases in turn because the contact pressure of the ligaments and the rotator cuff decreases.…”

Section: Introductionmentioning

confidence: 91%

“…Previous study of coracoacromial ligament elasticity with scanning acoustic microscopy, which can be used to evaluate the elasticity of tissue at the microscopic level, have shown that coracoacromial ligaments that show advanced degeneration have a higher elastic modulus [5]. This result suggests that because the coracoacromial ligament degenerates histologically and stiffens with aging, the contact pressure of the rotator cuff and the coracoacromial ligament increases and the prevalence of shoulder pain or rotator cuff tear increases with aging.…”

Section: Introductionmentioning

confidence: 99%

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Elasticity of the Coracoacromial Ligament in Shoulders with Rotator Cuff Tears: Measurement with Ultrasound Elastography

Kijima¹,

Minagawa²,

Tomioka³

et al. 2013

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Background: The symptoms of rotator cuff tear vary and may even be absent. Thus, the symptoms cannot be explained solely by the presence of rotator cuff tear, and other factors are thought to be involved. Because the rotator cuff comes in contact with the coracoacromial ligament, the elasticity of the ligament may be a factor of the symptoms. The purpose of this study was to clarify the elasticity of the coracoacromial ligament in live shoulders with rotator cuff tears. Methods: Forty-one shoulders in 24 persons were enrolled in this study. The average age was 52 years old (range, 15 - 84 years old). We investigated the presence of rotator cuff tear and measured the elasticity of the coracoacromial ligament by ultrasound elastography (EUB-7500, HITACHI, Japan). Ultrasound elastography was a useful method to quantify the strain of soft tissue when pressure was added. The strain ratio (the ratio of strain of the coracoacromial ligament to that of the rotator cuff) was used as the index of the elasticity of coracoacromial ligament. Thus, the higher the strain ratio was, the softer the ligament was. Results: The strain ratio of the coracoacromial ligaments without rotator cuff tear showed a negative correlation to the age (r = ﹣0.825, P < 0.01). The strain ratio of the ligaments with rotator cuff tear (23.75 ± 15.05, 69.6 years old) was higher than that of the older ligaments without cuff tear (12.62 ± 7.94, 64.6 years old) (P = 0.0486). In shoulders with rotator cuff tear, the strain ratio of the ligaments with pain (14.37 ± 10.15, 66.7 years old) was lower than that of ligaments without pain (33.12 ± 13.59, 69.1 years old) (P = 0.0221). Conclusions

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Section: Discussionsupporting
confidence: 91%

Section: Introductionmentioning
confidence: 91%

Section: Introductionmentioning
confidence: 99%

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Elasticity of the Coracoacromial Ligament in Shoulders with Rotator Cuff Tears: Measurement with Ultrasound Elastography
Kijima¹,
Minagawa²,
Tomioka³
et al. 2013
SS
Self Cite
5
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5
0
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Background: The symptoms of rotator cuff tear vary and may even be absent. Thus, the symptoms cannot be explained solely by the presence of rotator cuff tear, and other factors are thought to be involved. Because the rotator cuff comes in contact with the coracoacromial ligament, the elasticity of the ligament may be a factor of the symptoms. The purpose of this study was to clarify the elasticity of the coracoacromial ligament in live shoulders with rotator cuff tears. Methods: Forty-one shoulders in 24 persons were enrolled in this study. The average age was 52 years old (range, 15 - 84 years old). We investigated the presence of rotator cuff tear and measured the elasticity of the coracoacromial ligament by ultrasound elastography (EUB-7500, HITACHI, Japan). Ultrasound elastography was a useful method to quantify the strain of soft tissue when pressure was added. The strain ratio (the ratio of strain of the coracoacromial ligament to that of the rotator cuff) was used as the index of the elasticity of coracoacromial ligament. Thus, the higher the strain ratio was, the softer the ligament was. Results: The strain ratio of the coracoacromial ligaments without rotator cuff tear showed a negative correlation to the age (r = ﹣0.825, P < 0.01). The strain ratio of the ligaments with rotator cuff tear (23.75 ± 15.05, 69.6 years old) was higher than that of the older ligaments without cuff tear (12.62 ± 7.94, 64.6 years old) (P = 0.0486). In shoulders with rotator cuff tear, the strain ratio of the ligaments with pain (14.37 ± 10.15, 66.7 years old) was lower than that of ligaments without pain (33.12 ± 13.59, 69.1 years old) (P = 0.0221). Conclusions
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“…Since the 1980s, the acoustic properties of many organs and disease states have been investigated using SAM, such as myocardial infarction, 2 gastric carcinoma, kidney, 3 aortic atherosclerosis, 4 and ligaments. 5 To the best of our knowledge, no pulmonary diseases have been reported using SAM yet.…”

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confidence: 98%

Pulmonary imaging with a scanning acoustic microscope discriminates speed-of-sound and shows structural characteristics of disease
Miura
¹
,
Yamamoto
²

2012
Laboratory Investigation
29
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27
0
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Tissue elasticity can be detected using a scanning acoustic microscope (SAM), whereby acoustic images are created from the speed of sound through tissues. This system discriminated pulmonary tissue components and demonstrated distinct acoustic images of the lung; these results corresponded well to those obtained using the conventional microscope. SAM provides the following benefits: (1) images are acquired in only few minutes without requirement for staining, (2) basic data is obtained for low-frequency ultrasonic examination, and (3) speed of sound from each lesion is digital and comparable among diseases. Comparative analysis of cancer invasion, post-inflammatory fibrosis, and deposition disease was possible using the data obtained with the system, and the results showed good correlation with those using the conventional microscope and by clinical diagnosis. The SAM system is applicable not only to pulmonary diseases but also to various diseases in other organs.

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“…Echographic examination, known as echography, is an ultrasound-based diagnostic imaging technique and a standard procedure for imaging various organs such as liver, biliary tracts, pancreas, kidney, thyroid, breast, heart, blood vessels, urogenital organs, and lymph nodes (LNs). Since the 1980s, SAM has been used to investigate the acoustic properties of many organs and disease states such as myocardial infarction3, renal diseases4, aortic atherosclerosis5, diseases of ligaments6, and lungs7. To the best of our knowledge, very few studies have reported SAM imaging of LNs.…”

mentioning
confidence: 99%

Scanning acoustic microscopy for characterization of neoplastic and inflammatory lesions of lymph nodes
Miura¹,
Nasu
²
,
Yamamoto
³

2013
Sci Rep
46
0
30
0
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A scanning acoustic microscope (SAM) imaging system calculates and color codes speed of sound (SOS). We evaluated the SAM results for lymph node imaging and compared these results with those of light microscopy (LM). SAM showed normal structures and localized/diffuse lesions of the lymph node. Our results revealed that as a rule, soft areas such as cystic necrosis presented less SOS while harder areas such as coagulative necrosis, granulomas, and fibrosis exhibited greater SOS. SOS increased according to stromal desmoplastic reactions and cellular concentration. In neoplastic lesions, statistically significant differences in SOS were observed among scirrhous carcinomas, lymphomas, and medullary carcinomas. SAM provided the following benefits over LM: (1) images reflected the tissue elasticity of each lesion, (2) digitized SOS data could be statistically comparable, (3) images were acquired in a few minutes without special staining, (4) SAM images and echographic images were comparable for clinical ultrasound imaging study.

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Degenerated coracoacromial ligament in shoulders with rotator cuff tears shows higher elastic modulus: measurement with scanning acoustic microscopy

Cited by 14 publications

References 20 publications

Elasticity of the Coracoacromial Ligament in Shoulders with Rotator Cuff Tears: Measurement with Ultrasound Elastography

Elasticity of the Coracoacromial Ligament in Shoulders with Rotator Cuff Tears: Measurement with Ultrasound Elastography

Pulmonary imaging with a scanning acoustic microscope discriminates speed-of-sound and shows structural characteristics of disease

Scanning acoustic microscopy for characterization of neoplastic and inflammatory lesions of lymph nodes

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