The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform

Li-wei Hung - One of the best experts on this subject based on the ideXlab platform.

  • Teres Minor Muscle Hypertrophy is Negative Predictor for Outcomes after Reverse Total Shoulder Arthroplasty: An Evaluation of Pre-Operative MRI and Post-Operative Implant Position
    Journal of shoulder and elbow surgery, 2021
    Co-Authors: Li-wei Hung, Austin Lee, Alan L. Zhang, Brian T. Feeley, Weiyuan Xiao, Drew A. Lansdown
    Abstract:

    Abstract Background Predictors of outcomes after reverse total shoulder arthroplasty (rTSA) remain unclear. The purpose of this study was to analyze the impact of preoperative Muscle quality and postoperative implant positioning on patient-reported outcomes following rTSA. Methods We evaluated 88 shoulders treated with rTSA who had an available preoperative MRI. Preoperative Muscle quality was evaluated, including fatty infiltration, rotator cuff Muscle volume and total tear size. Postoperative implant position was determined radiographically. The correlation between imaging parameters and the 2 years postoperative American Shoulder and Elbow Surgeons (ASES) score was examined. Multivariate analyses were performed to adjust for confounding factors including patient demographics and implant position. Results Univariate analysis showed that ASES score was significantly lower in patients with Teres Minor Muscle hypertrophy relative to those with normal Muscle (73.3±22.8 vs 84.2±16.9; P=0.02). The functional sub-score was significantly lower in patients with grade 2 deltoid Muscle relative to those with grade 0 fatty infiltration (26.1±14.6 vs 34.8±11.6; P=0.03). Older age was associated with higher pain sub-score (ρ = 0.32, P = 0.002). Multivariate analysis demonstrated that Teres Minor Muscle hypertrophy remained a significant independent predictor for ASES score (beta coefficient =91.3, P =0.03). Conclusion Teres Minor Muscle hypertrophy is an independent negative predictor of patient reported outcomes after rTSA.

  • Teres Minor Muscle hypertrophy is a negative predictor of outcomes after reverse total shoulder arthroplasty an evaluation of preoperative magnetic resonance imaging and postoperative implant position
    Journal of Shoulder and Elbow Surgery, 2021
    Co-Authors: Li-wei Hung, Austin Lee, Alan L. Zhang, Brian T. Feeley, Weiyuan Xiao, Drew A. Lansdown
    Abstract:

    Background Predictors of outcomes after reverse total shoulder arthroplasty (rTSA) remain unclear. The purpose of this study was to analyze the impact of preoperative Muscle quality and postoperative implant positioning on patient-reported outcomes following rTSA. Methods We evaluated 88 shoulders treated with rTSA in which preoperative magnetic resonance imaging was available. Preoperative Muscle quality was evaluated, including fatty infiltration, rotator cuff Muscle volume, and total tear size. Postoperative implant position was determined radiographically. The correlation between imaging parameters and the 2-year postoperative American Shoulder and Elbow Surgeons (ASES) score was examined. Multivariate analyses were performed to adjust for confounding factors including patient demographic characteristics and implant position. Results Univariate analysis showed that the ASES score was significantly lower in patients with Teres Minor Muscle hypertrophy relative to those with normal Muscle (73.3 ± 22.8 vs. 84.2 ± 16.9, P = .02). The functional subscore was significantly lower in patients with grade 2 fatty infiltration of the deltoid Muscle relative to those with grade 0 fatty infiltration (26.1 ± 14.6 vs. 34.8 ± 11.6, P = .03). Older age was associated with a higher pain subscore (ρ = 0.32, P = .002). Multivariate analysis demonstrated that Teres Minor Muscle hypertrophy remained a significant independent predictor of the ASES score (β coefficient = 91.3, P = .03). Conclusion Teres Minor Muscle hypertrophy is an independent negative predictor of patient-reported outcomes after rTSA.

Kai Henrik Wiborg Lange - One of the best experts on this subject based on the ideXlab platform.

  • ultrasound guided block of the axillary nerve a volunteer study of a new method
    Acta Anaesthesiologica Scandinavica, 2011
    Co-Authors: Christian Rothe, Semera Asghar, H L Andersen, J.k. Christensen, Kai Henrik Wiborg Lange
    Abstract:

    Background: Interscalene brachial plexus block (IBPB) is the gold standard for perioperative pain management in shoulder surgery. However, a more distal technique would be desirable to avoid the side effects and potential serious complications of IBPB. Therefore, the aim of the present study was to develop and describe a new method to perform an ultrasound-guided specific axillary nerve block. Methods: After initial investigations, 12 healthy volunteers were included. We performed an in-line ultrasound-guided specific axillary nerve block by injecting 8 ml local anesthetic (lidocaine 20 mg/ml) after placing the tip of a nerve stimulation needle cranial to the posterior circumflex humeral artery in the neurovascular space bordered by the Teres Minor Muscle, the deltoid Muscle, the triceps Muscle and the shaft of the humerus. Needle placement was aided by simultaneous nerve stimulation. We assessed sensory (pinprick and cold stimulation) and motor (active resistive force) block of the axillary nerve before, 15, 30, 60, 90 and 120 min after performing the block and every 30 min until termination of the block. Results: All 12 volunteers demonstrated sensory block of the axillary nerve and 10 volunteers demonstrated complete motor block. Even though it was difficult to directly visualize the axillary nerve, the block was easy to perform with easily recognizable ultrasonographic landmarks. Block duration was approximately 120 min. Conclusions: We describe a new ultrasound-guided technique to specifically block the axillary nerve. The potential clinical role of this new block remains to be determined.

  • Ultrasound‐guided block of the axillary nerve: a volunteer study of a new method
    Acta Anaesthesiologica Scandinavica, 2011
    Co-Authors: Christian Rothe, Semera Asghar, H L Andersen, J.k. Christensen, Kai Henrik Wiborg Lange
    Abstract:

    Background: Interscalene brachial plexus block (IBPB) is the gold standard for perioperative pain management in shoulder surgery. However, a more distal technique would be desirable to avoid the side effects and potential serious complications of IBPB. Therefore, the aim of the present study was to develop and describe a new method to perform an ultrasound-guided specific axillary nerve block. Methods: After initial investigations, 12 healthy volunteers were included. We performed an in-line ultrasound-guided specific axillary nerve block by injecting 8 ml local anesthetic (lidocaine 20 mg/ml) after placing the tip of a nerve stimulation needle cranial to the posterior circumflex humeral artery in the neurovascular space bordered by the Teres Minor Muscle, the deltoid Muscle, the triceps Muscle and the shaft of the humerus. Needle placement was aided by simultaneous nerve stimulation. We assessed sensory (pinprick and cold stimulation) and motor (active resistive force) block of the axillary nerve before, 15, 30, 60, 90 and 120 min after performing the block and every 30 min until termination of the block. Results: All 12 volunteers demonstrated sensory block of the axillary nerve and 10 volunteers demonstrated complete motor block. Even though it was difficult to directly visualize the axillary nerve, the block was easy to perform with easily recognizable ultrasonographic landmarks. Block duration was approximately 120 min. Conclusions: We describe a new ultrasound-guided technique to specifically block the axillary nerve. The potential clinical role of this new block remains to be determined.

Drew A. Lansdown - One of the best experts on this subject based on the ideXlab platform.

  • Teres Minor Muscle Hypertrophy is Negative Predictor for Outcomes after Reverse Total Shoulder Arthroplasty: An Evaluation of Pre-Operative MRI and Post-Operative Implant Position
    Journal of shoulder and elbow surgery, 2021
    Co-Authors: Li-wei Hung, Austin Lee, Alan L. Zhang, Brian T. Feeley, Weiyuan Xiao, Drew A. Lansdown
    Abstract:

    Abstract Background Predictors of outcomes after reverse total shoulder arthroplasty (rTSA) remain unclear. The purpose of this study was to analyze the impact of preoperative Muscle quality and postoperative implant positioning on patient-reported outcomes following rTSA. Methods We evaluated 88 shoulders treated with rTSA who had an available preoperative MRI. Preoperative Muscle quality was evaluated, including fatty infiltration, rotator cuff Muscle volume and total tear size. Postoperative implant position was determined radiographically. The correlation between imaging parameters and the 2 years postoperative American Shoulder and Elbow Surgeons (ASES) score was examined. Multivariate analyses were performed to adjust for confounding factors including patient demographics and implant position. Results Univariate analysis showed that ASES score was significantly lower in patients with Teres Minor Muscle hypertrophy relative to those with normal Muscle (73.3±22.8 vs 84.2±16.9; P=0.02). The functional sub-score was significantly lower in patients with grade 2 deltoid Muscle relative to those with grade 0 fatty infiltration (26.1±14.6 vs 34.8±11.6; P=0.03). Older age was associated with higher pain sub-score (ρ = 0.32, P = 0.002). Multivariate analysis demonstrated that Teres Minor Muscle hypertrophy remained a significant independent predictor for ASES score (beta coefficient =91.3, P =0.03). Conclusion Teres Minor Muscle hypertrophy is an independent negative predictor of patient reported outcomes after rTSA.

  • Teres Minor Muscle hypertrophy is a negative predictor of outcomes after reverse total shoulder arthroplasty an evaluation of preoperative magnetic resonance imaging and postoperative implant position
    Journal of Shoulder and Elbow Surgery, 2021
    Co-Authors: Li-wei Hung, Austin Lee, Alan L. Zhang, Brian T. Feeley, Weiyuan Xiao, Drew A. Lansdown
    Abstract:

    Background Predictors of outcomes after reverse total shoulder arthroplasty (rTSA) remain unclear. The purpose of this study was to analyze the impact of preoperative Muscle quality and postoperative implant positioning on patient-reported outcomes following rTSA. Methods We evaluated 88 shoulders treated with rTSA in which preoperative magnetic resonance imaging was available. Preoperative Muscle quality was evaluated, including fatty infiltration, rotator cuff Muscle volume, and total tear size. Postoperative implant position was determined radiographically. The correlation between imaging parameters and the 2-year postoperative American Shoulder and Elbow Surgeons (ASES) score was examined. Multivariate analyses were performed to adjust for confounding factors including patient demographic characteristics and implant position. Results Univariate analysis showed that the ASES score was significantly lower in patients with Teres Minor Muscle hypertrophy relative to those with normal Muscle (73.3 ± 22.8 vs. 84.2 ± 16.9, P = .02). The functional subscore was significantly lower in patients with grade 2 fatty infiltration of the deltoid Muscle relative to those with grade 0 fatty infiltration (26.1 ± 14.6 vs. 34.8 ± 11.6, P = .03). Older age was associated with a higher pain subscore (ρ = 0.32, P = .002). Multivariate analysis demonstrated that Teres Minor Muscle hypertrophy remained a significant independent predictor of the ASES score (β coefficient = 91.3, P = .03). Conclusion Teres Minor Muscle hypertrophy is an independent negative predictor of patient-reported outcomes after rTSA.

Christian Rothe - One of the best experts on this subject based on the ideXlab platform.

  • ultrasound guided block of the axillary nerve a volunteer study of a new method
    Acta Anaesthesiologica Scandinavica, 2011
    Co-Authors: Christian Rothe, Semera Asghar, H L Andersen, J.k. Christensen, Kai Henrik Wiborg Lange
    Abstract:

    Background: Interscalene brachial plexus block (IBPB) is the gold standard for perioperative pain management in shoulder surgery. However, a more distal technique would be desirable to avoid the side effects and potential serious complications of IBPB. Therefore, the aim of the present study was to develop and describe a new method to perform an ultrasound-guided specific axillary nerve block. Methods: After initial investigations, 12 healthy volunteers were included. We performed an in-line ultrasound-guided specific axillary nerve block by injecting 8 ml local anesthetic (lidocaine 20 mg/ml) after placing the tip of a nerve stimulation needle cranial to the posterior circumflex humeral artery in the neurovascular space bordered by the Teres Minor Muscle, the deltoid Muscle, the triceps Muscle and the shaft of the humerus. Needle placement was aided by simultaneous nerve stimulation. We assessed sensory (pinprick and cold stimulation) and motor (active resistive force) block of the axillary nerve before, 15, 30, 60, 90 and 120 min after performing the block and every 30 min until termination of the block. Results: All 12 volunteers demonstrated sensory block of the axillary nerve and 10 volunteers demonstrated complete motor block. Even though it was difficult to directly visualize the axillary nerve, the block was easy to perform with easily recognizable ultrasonographic landmarks. Block duration was approximately 120 min. Conclusions: We describe a new ultrasound-guided technique to specifically block the axillary nerve. The potential clinical role of this new block remains to be determined.

  • Ultrasound‐guided block of the axillary nerve: a volunteer study of a new method
    Acta Anaesthesiologica Scandinavica, 2011
    Co-Authors: Christian Rothe, Semera Asghar, H L Andersen, J.k. Christensen, Kai Henrik Wiborg Lange
    Abstract:

    Background: Interscalene brachial plexus block (IBPB) is the gold standard for perioperative pain management in shoulder surgery. However, a more distal technique would be desirable to avoid the side effects and potential serious complications of IBPB. Therefore, the aim of the present study was to develop and describe a new method to perform an ultrasound-guided specific axillary nerve block. Methods: After initial investigations, 12 healthy volunteers were included. We performed an in-line ultrasound-guided specific axillary nerve block by injecting 8 ml local anesthetic (lidocaine 20 mg/ml) after placing the tip of a nerve stimulation needle cranial to the posterior circumflex humeral artery in the neurovascular space bordered by the Teres Minor Muscle, the deltoid Muscle, the triceps Muscle and the shaft of the humerus. Needle placement was aided by simultaneous nerve stimulation. We assessed sensory (pinprick and cold stimulation) and motor (active resistive force) block of the axillary nerve before, 15, 30, 60, 90 and 120 min after performing the block and every 30 min until termination of the block. Results: All 12 volunteers demonstrated sensory block of the axillary nerve and 10 volunteers demonstrated complete motor block. Even though it was difficult to directly visualize the axillary nerve, the block was easy to perform with easily recognizable ultrasonographic landmarks. Block duration was approximately 120 min. Conclusions: We describe a new ultrasound-guided technique to specifically block the axillary nerve. The potential clinical role of this new block remains to be determined.

Russell F Warren - One of the best experts on this subject based on the ideXlab platform.

  • Supporting layers of the glenohumeral joint. An anatomic study.
    Clinical Orthopaedics and Related Research, 1993
    Co-Authors: Daniel E. Cooper, Stephen J. O'brien, Russell F Warren
    Abstract:

    Based on anatomic and surgical dissections, the anatomy of the shoulder region is described in terms of four layers that overlie and support the glenohumeral joint. Each layer envelops the glenohumeral joint on its anterior, lateral, and posterior aspects, and between each layer there is a plane for safe and easy dissection. Layer 1 is composed of the deltoid and pectoralis major Muscle bellies with their overlying fascia and enveloping epimysium. Anteriorly, Layer 2 consists of the clavipectoral fascia, the conjoined tendon of the short head of the biceps and coracobrachialis, and the coracoacromial ligament. Posteriorly, Layer 2 is the dense posterior scapular fascia that overlies the infraspinatus and Teres Minor Muscle bellies

  • Supporting layers of the glenohumeral joint. An anatomic study.
    Clinical Orthopaedics and Related Research, 1993
    Co-Authors: Cooper De, Stephen J. O'brien, Russell F Warren
    Abstract:

    : Based on anatomic and surgical dissections, the anatomy of the shoulder region is described in terms of four layers that overlie and support the glenohumeral joint. Each layer envelops the glenohumeral joint on its anterior, lateral, and posterior aspects, and between each layer there is a plane for safe and easy dissection. Layer 1 is composed of the deltoid and pectoralis major Muscle bellies with their overlying fascia and enveloping epimysium. Anteriorly, Layer 2 consists of the clavipectoral fascia, the conjoined tendon of the short head of the biceps and coracobrachialis, and the coracoacromial ligament. Posteriorly, Layer 2 is the dense posterior scapular fascia that overlies the infraspinatus and Teres Minor Muscle bellies. It is continuous with the clavipectoral fascia around the lateral aspect of the proximal humerus. Deep to Layer 2, the subdeltoid bursa yields a dissection plane that encompasses the anterior, lateral, superior, and variably the posterior aspects of the glenohumeral joint. Layer 3 consists of the deep layer of the subdeltoid bursa and the underlying musculotendinous units of the rotator cuff, including subscapularis, supraspinatus, infraspinatus, and Teres Minor. Layer 4 is the capsule of the glenohumeral joint. This includes the glenohumeral ligaments and coracohumeral ligament. These four layers were present and consistent in each shoulder dissected. Significant variations were present only within the deepest layer (shoulder joint capsule). This system can serve as a learning tool and will provide a more organized approach to facilitate surgical dissection in the region.