The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
James E Carpenter - One of the best experts on this subject based on the ideXlab platform.
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Coracoacromial Ligament in situ load and viscoelastic properties in rotator cuff disease
Clinical Orthopaedics and Related Research, 1996Co-Authors: Louis J. Soslowsky, C M Debano, James E CarpenterAbstract:The Coracoacromial Ligament plays a role in rotator cuff disease. The changes in the in situ load and viscoelastic properties of the Coracoacromial Ligament in shoulders with rotator cuff tears were evaluated. Coracoacromial Ligaments from 16 cadaveric shoulders (8 with rotator cuff tears, 8 without tears) were evaluated via biomechanical testing of bone Ligament bone specimens. An in situ load existed in the Coracoacromial Ligaments of 19.6 +/- 15.4 N (rotator cuff tear) and 18.3 +/- 9.8 N (no rotator cuff tear). This difference was not statistically significant. Cyclic loading of the Ligaments demonstrated a greater drop in peak stress in rotator cuff tear shoulders than in normal shoulders, whereas the stress relaxation response was not different. These changes in the Coracoacromial Ligament in shoulders with cuff tears may be attributable to ultrastructural changes within the Ligament as a result of an altered loading environment. It remains unknown whether they occur as a result of a rotator cuff tear or if they contribute to the pathogenesis of cuff disease.
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Coracoacromial Ligament in situ load and viscoelastic properties in rotator cuff disease perspectives in shoulder research
Clinical Orthopaedics and Related Research, 1996Co-Authors: Louis J. Soslowsky, C M Debano, James E CarpenterAbstract:The Coracoacromial Ligament plays a role in rotator cuff disease. The changes in the in situ load and viscoelastic properties of the Coracoacromial Ligament in shoulders with rotator cuff tears were evaluated. Coracoacromial Ligaments from 16 cadaveric shoulders (8 with rotator cuff tears, 8 without tears) were evaluated via biomechanical testing of bone Ligament bone specimens. An in situ load existed in the Coracoacromial Ligaments of 19.6 ± 15.4 N (rotator cuff tear) and 18.3 ± 9.8 N (no rotator cuff tear). This difference was not statistically significant. Cyclic loading of the Ligaments demonstrated a greater drop in peak stress in rotator cuff tear shoulders than in normal shoulders, whereas the stress relaxation response was not different. These changes in the Coracoacromial Ligament in shoulders with cuff tears may be attributable to ultrastructural changes within the Ligament as a result of an altered loading environment. It remains unknown whether they occur as a result of a rotator cuff tear or if they contribute to the pathogenesis of cuff disease.
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geometric and mechanical properties of the Coracoacromial Ligament and their relationship to rotator cuff disease
Clinical Orthopaedics and Related Research, 1994Co-Authors: Louis J. Soslowsky, Shawn P Johnston, James E CarpenterAbstract:One of the most common causes of pain and disability in the upper limb is inflammation of the rotator cuff tendons. When no significant bony abnormality exists in the surrounding structures, the Coracoacromial Ligament has been implicated as a possible cause of impingement on the cuff tendons. Geometric and mechanical properties of 20 Coracoacromial Ligaments, 10 from shoulders with rotator cuff tears and 10 from normal shoulders, were accurately determined. In comparing rotator cuff tear and normal specimens, statistically significant changes in geometric properties were measured in the lateral band, but not in the medial band, of the Ligament. The lateral band, which is the region most likely to impinge on the rotator cuff, was shorter and had a larger cross-sectional area in specimens with rotator cuff tears. Although there were no statistical differences in structural properties of the Ligament between normal and rotator cuff tear groups, significant changes were evident in material properties. Previously reported histologic differences in the Ligament in shoulders with rotator cuff tears are supported by the decreased material properties measured in the current study. Whether the differences in the Coracoacromial Ligament cause impingement or are due to impingement is still unknown at this time.
Manuel Marín - One of the best experts on this subject based on the ideXlab platform.
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open anterior acromioplasty with preservation of the Coracoacromial Ligament a modified surgical technique
Journal of Shoulder and Elbow Surgery, 2003Co-Authors: Carlos Torrens, Joan Miquel Lopez, Enrique Verdier, Manuel MarínAbstract:Abstract The importance of the preservation of the subacromial arch has been stressed recently, especially in irreparable lesions of the rotator cuff to prevent anterosuperior migration of the humeral head. The purpose of this article is to describe the surgical technique of a modified open anterior acromioplasty performed through an intra-acromial osteotomy that increases the subacromial space and preserves the insertion of the Coracoacromial Ligament on the undersurface of the acromion. To compare this new technique with classical acromioplasty, a prospective but nonrandomized study was performed including 20 patients undergoing open anterior acromioplasty and 22 patients undergoing a modified open anterior acromioplasty. At a mean follow-up of 18 months, no differences related to shoulder function as evaluated by the Constant score were found between these two groups. This modified acromioplasty increases the subacromial space, preserving the anatomy of the subacromial arch, and provides functional results as good as those obtained with classical open acromioplasty. (J Shoulder Elbow Surg 2003;12:9-14)
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open anterior acromioplasty with preservation of the Coracoacromial Ligament a modified surgical technique
Journal of Shoulder and Elbow Surgery, 2003Co-Authors: Carlos Torrens, Joan Miquel Lopez, Enrique Verdier, Manuel MarínAbstract:The importance of the preservation of the subacromial arch has been stressed recently, especially in irreparable lesions of the rotator cuff to prevent anterosuperior migration of the humeral head. The purpose of this article is to describe the surgical technique of a modified open anterior acromioplasty performed through an intra-acromial osteotomy that increases the subacromial space and preserves the insertion of the Coracoacromial Ligament on the undersurface of the acromion. To compare this new technique with classical acromioplasty, a prospective but nonrandomized study was performed including 20 patients undergoing open anterior acromioplasty and 22 patients undergoing a modified open anterior acromioplasty. At a mean follow-up of 18 months, no differences related to shoulder function as evaluated by the Constant score were found between these two groups. This modified acromioplasty increases the subacromial space, preserving the anatomy of the subacromial arch, and provides functional results as good as those obtained with classical open acromioplasty.
Louis J. Soslowsky - One of the best experts on this subject based on the ideXlab platform.
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Coracoacromial Ligament in situ load and viscoelastic properties in rotator cuff disease
Clinical Orthopaedics and Related Research, 1996Co-Authors: Louis J. Soslowsky, C M Debano, James E CarpenterAbstract:The Coracoacromial Ligament plays a role in rotator cuff disease. The changes in the in situ load and viscoelastic properties of the Coracoacromial Ligament in shoulders with rotator cuff tears were evaluated. Coracoacromial Ligaments from 16 cadaveric shoulders (8 with rotator cuff tears, 8 without tears) were evaluated via biomechanical testing of bone Ligament bone specimens. An in situ load existed in the Coracoacromial Ligaments of 19.6 +/- 15.4 N (rotator cuff tear) and 18.3 +/- 9.8 N (no rotator cuff tear). This difference was not statistically significant. Cyclic loading of the Ligaments demonstrated a greater drop in peak stress in rotator cuff tear shoulders than in normal shoulders, whereas the stress relaxation response was not different. These changes in the Coracoacromial Ligament in shoulders with cuff tears may be attributable to ultrastructural changes within the Ligament as a result of an altered loading environment. It remains unknown whether they occur as a result of a rotator cuff tear or if they contribute to the pathogenesis of cuff disease.
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Coracoacromial Ligament in situ load and viscoelastic properties in rotator cuff disease perspectives in shoulder research
Clinical Orthopaedics and Related Research, 1996Co-Authors: Louis J. Soslowsky, C M Debano, James E CarpenterAbstract:The Coracoacromial Ligament plays a role in rotator cuff disease. The changes in the in situ load and viscoelastic properties of the Coracoacromial Ligament in shoulders with rotator cuff tears were evaluated. Coracoacromial Ligaments from 16 cadaveric shoulders (8 with rotator cuff tears, 8 without tears) were evaluated via biomechanical testing of bone Ligament bone specimens. An in situ load existed in the Coracoacromial Ligaments of 19.6 ± 15.4 N (rotator cuff tear) and 18.3 ± 9.8 N (no rotator cuff tear). This difference was not statistically significant. Cyclic loading of the Ligaments demonstrated a greater drop in peak stress in rotator cuff tear shoulders than in normal shoulders, whereas the stress relaxation response was not different. These changes in the Coracoacromial Ligament in shoulders with cuff tears may be attributable to ultrastructural changes within the Ligament as a result of an altered loading environment. It remains unknown whether they occur as a result of a rotator cuff tear or if they contribute to the pathogenesis of cuff disease.
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geometric and mechanical properties of the Coracoacromial Ligament and their relationship to rotator cuff disease
Clinical Orthopaedics and Related Research, 1994Co-Authors: Louis J. Soslowsky, Shawn P Johnston, James E CarpenterAbstract:One of the most common causes of pain and disability in the upper limb is inflammation of the rotator cuff tendons. When no significant bony abnormality exists in the surrounding structures, the Coracoacromial Ligament has been implicated as a possible cause of impingement on the cuff tendons. Geometric and mechanical properties of 20 Coracoacromial Ligaments, 10 from shoulders with rotator cuff tears and 10 from normal shoulders, were accurately determined. In comparing rotator cuff tear and normal specimens, statistically significant changes in geometric properties were measured in the lateral band, but not in the medial band, of the Ligament. The lateral band, which is the region most likely to impinge on the rotator cuff, was shorter and had a larger cross-sectional area in specimens with rotator cuff tears. Although there were no statistical differences in structural properties of the Ligament between normal and rotator cuff tear groups, significant changes were evident in material properties. Previously reported histologic differences in the Ligament in shoulders with rotator cuff tears are supported by the decreased material properties measured in the current study. Whether the differences in the Coracoacromial Ligament cause impingement or are due to impingement is still unknown at this time.
Carlos Torrens - One of the best experts on this subject based on the ideXlab platform.
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open anterior acromioplasty with preservation of the Coracoacromial Ligament a modified surgical technique
Journal of Shoulder and Elbow Surgery, 2003Co-Authors: Carlos Torrens, Joan Miquel Lopez, Enrique Verdier, Manuel MarínAbstract:Abstract The importance of the preservation of the subacromial arch has been stressed recently, especially in irreparable lesions of the rotator cuff to prevent anterosuperior migration of the humeral head. The purpose of this article is to describe the surgical technique of a modified open anterior acromioplasty performed through an intra-acromial osteotomy that increases the subacromial space and preserves the insertion of the Coracoacromial Ligament on the undersurface of the acromion. To compare this new technique with classical acromioplasty, a prospective but nonrandomized study was performed including 20 patients undergoing open anterior acromioplasty and 22 patients undergoing a modified open anterior acromioplasty. At a mean follow-up of 18 months, no differences related to shoulder function as evaluated by the Constant score were found between these two groups. This modified acromioplasty increases the subacromial space, preserving the anatomy of the subacromial arch, and provides functional results as good as those obtained with classical open acromioplasty. (J Shoulder Elbow Surg 2003;12:9-14)
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open anterior acromioplasty with preservation of the Coracoacromial Ligament a modified surgical technique
Journal of Shoulder and Elbow Surgery, 2003Co-Authors: Carlos Torrens, Joan Miquel Lopez, Enrique Verdier, Manuel MarínAbstract:The importance of the preservation of the subacromial arch has been stressed recently, especially in irreparable lesions of the rotator cuff to prevent anterosuperior migration of the humeral head. The purpose of this article is to describe the surgical technique of a modified open anterior acromioplasty performed through an intra-acromial osteotomy that increases the subacromial space and preserves the insertion of the Coracoacromial Ligament on the undersurface of the acromion. To compare this new technique with classical acromioplasty, a prospective but nonrandomized study was performed including 20 patients undergoing open anterior acromioplasty and 22 patients undergoing a modified open anterior acromioplasty. At a mean follow-up of 18 months, no differences related to shoulder function as evaluated by the Constant score were found between these two groups. This modified acromioplasty increases the subacromial space, preserving the anatomy of the subacromial arch, and provides functional results as good as those obtained with classical open acromioplasty.
Stephen A. Copeland - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties of regenerated Coracoacromial Ligament after subacromial decompression
Journal of Shoulder and Elbow Surgery, 2004Co-Authors: Ulrich Hansen, Ofer Levy, Tirtza Even, Stephen A. CopelandAbstract:Recent publications suggest that the Coracoacromial Ligament regenerates after it has been partially excised during subacromial decompression or acromioplasty. This observation may aid the understanding of the successes and failures of this very commonly performed surgical procedure. This study determines the mechanical properties of the apparently regenerated Ligament. Eight regenerated Coracoacromial Ligaments were excised during revision surgery after subacromial decompression and were taken for mechanical testing. It appears that the Ligament does have the ability to re-form relatively quickly after subacromial decompression or acromioplasty but takes time to regain strength. The results indicate that the Ligament may possibly regain normal mechanical properties after regeneration times in excess of 3 years.
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regeneration of the Coracoacromial Ligament after acromioplasty and arthroscopic subacromial decompression
Journal of Shoulder and Elbow Surgery, 2001Co-Authors: Ofer Levy, Stephen A. CopelandAbstract:The clinical observation of apparent and complete regeneration of the Coracoacromial Ligament after known partial excision of the Ligament and acromioplasty has been investigated. Ten patients who had open revision surgery following failure of symptomatic relief after arthroscopic subacromial decompression were studied. All of them had acromioplasty with documented partial resection of the Coracoacromial Ligament at the first operation. There were 5 men and 5 women with an average age of 54.5 years (range, 44-65 years). In all patients surgery revealed a Ligamentous structure resembling the Coracoacromial Ligament that was attached to the anterior acromion. Histology in all patients revealed appearances indistinguishable from normal Ligament, which was in continuity with the reformed periosteum of the acromion. (J Shoulder Elbow Surg 2001;10:317-20.)