Effect of deltoid volume on range of motion and patient-reported outcomes following reverse total shoulder arthroplasty in rotator cuff-intact and rotator cuff-deficient conditions

2020 ◽  
pp. 175857322092504
Author(s):  
Samuel G McClatchy ◽  
Griffin M Heise ◽  
William M Mihalko ◽  
Frederick M Azar ◽  
Richard A Smith ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Range Of Motion ◽  
Shoulder Arthroplasty ◽  
Patient Reported Outcomes ◽  
Total Shoulder Arthroplasty ◽  
Deltoid Muscle ◽  
Reverse Total Shoulder Arthroplasty ◽  
Shoulder Range Of Motion ◽  
Patient Reported ◽  
Reverse Total Shoulder

Background Deltoid muscle function is paramount to the success of reverse total shoulder arthroplasty. The purpose of this study was to investigate the role of deltoid volume on shoulder range of motion and patient-reported outcomes following reverse total shoulder arthroplasty in rotator cuff-intact and rotator cuff-deficient conditions. Methods Retrospective review of records identified 107 patients who met inclusion criteria. The rotator cuff integrity was evaluated by two musculoskeletal-trained radiologists. Volumetric deltoid measurements were calculated from preoperative computed tomography or magnetic resonance imaging scans. Satisfactory outcomes were defined as forward elevation of at least 135°, external rotation of at least 35°, and American Shoulder and Elbow Surgeons and Single Assessment Numerical Evaluation scores of at least 70. Results Mean total deltoid muscle volume was significantly higher in patients with satisfactory forward elevation (57.8 ± 18.1 cm³) versus unsatisfactory forward elevation (48.6 ± 19.5 cm³) (p = 0.013). When separated by rotator cuff integrity, total deltoid volume was significantly higher (p = 0.030) in patients who achieved satisfactory forward elevation in the rotator cuff-deficient group but not the rotator cuff-intact group (p = 0.533). Discussion Preoperative deltoid volume directly correlated with achieving satisfactory forward elevation after reverse total shoulder arthroplasty in rotator cuff-deficient conditions and may be one factor in determining the ability to achieve satisfactory outcomes in the rotator cuff-deficient patient.

Influence of Humeral Version and Deltoid Tension on Glenohumeral Kinematics After Reverse Total Shoulder Arthroplasty

2011 ◽  
Author(s):  
Heath B. Henninger ◽  
Alexej Barg ◽  
Robert Z. Tashjian ◽  
Robert T. Burks ◽  
Kent N. Bachus ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Range Of Motion ◽  
Outcome Measures ◽  
Shoulder Arthroplasty ◽  
Surgical Intervention ◽  
Total Shoulder Arthroplasty ◽  
Reverse Total Shoulder Arthroplasty ◽  
And Function ◽  
Reverse Total Shoulder

Reverse total shoulder arthroplasty (rTSA) is used to improve pain and function in arthritic, rotator cuff deficient shoulders. Surgical intervention is considered successful if range of motion and stability of the joint is maximized and force to abduct the arm is minimized. Implant hardware positioning may affect these outcome measures.

Surface Electromyography Reveals Middle Deltoid as The Functionally Dominant Shoulder Muscle After Reverse Total Shoulder Arthroplasty

2021 ◽  
Author(s):  
Emily Lau ◽  
Alexander Pietroski ◽  
Sreten Franovic ◽  
Yang Zhou ◽  
Noah Kuhlmann ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Shoulder Arthroplasty ◽  
Muscle Activation ◽  
Total Shoulder Arthroplasty ◽  
Deltoid Muscle ◽  
Reverse Total Shoulder Arthroplasty ◽  
Shoulder Abduction ◽  
Shoulder Muscle ◽  
Significant Difference ◽  
Reverse Total Shoulder

Abstract Background: Reverse total shoulder arthroplasty (RSA) increases deltoid muscle fiber recruitment and tension to compensate for deficient rotator cuff activity; however, it is unclear whether the anterior or middle deltoid becomes dominant and how the muscle activation profile changes postoperatively. Using minimally invasive electromyography, this study evaluated the activity of the deltoid and surrounding muscles during shoulder motion to assess muscle activation changes post-RSA. Methods: In this observational study, we assessed change in preoperative to postoperative shoulder muscle activation in 10 patients over 6 months. Muscle activation was measured using 8 surface electrodes. Activation of the anterior, middle and posterior deltoid and surrounding muscles were recorded during shoulder abduction, flexion, external and internal rotation were quantified. One-way analysis of variance was used to identify significant differences in activation and time or speed. Least significant difference post hoc test was used to determine specific differences in muscle activation at subsequent time points. Results: RSA shoulders at 6 months postoperative showed a significant increase in activity of the middle deltoid predominantly. Middle deltoid activation increased during abduction (P < 0.001), flexion (P = 0.008), external (P < 0.001) and internal (P < 0.001) rotation. Conclusions: Our study demonstrates the middle deltoid predominates in rotator cuff function in RSA as defined by quantitative activation, significant involvement in all shoulder motions, and increased activation at subsequent times. These findings may help guide future RSA designs to optimize deltoid wrapping allowing for maximal strength and efficiency.

Reassessing glenoid inclination in reverse total shoulder arthroplasty with glenosphere lateralization

2021 ◽  
Vol 103-B (2) ◽  
pp. 360-365
Author(s):  
Kuhan A. Mahendraraj ◽  
Maggie V. Shields ◽  
Florian Grubhofer ◽  
Samuel W. Golenbock ◽  
Andrew Jawa
Keyword(s):  
Heterotopic Ossification ◽  
Shoulder Arthroplasty ◽  
Patient Reported Outcomes ◽  
External Rotation ◽  
Total Shoulder Arthroplasty ◽  
Reverse Total Shoulder Arthroplasty ◽  
Scapular Notching ◽  
Patient Reported ◽  
Reverse Total Shoulder

Aims Existing literature indicates that inferiorly inclined glenoid baseplates following reverse total shoulder arthroplasty (RSA) produce better outcomes compared to superiorly inclined baseplates. We aim to compare clinical outcomes for RSAs with superiorly and neutrally/inferiorly inclined lateralized glenospheres. Methods We retrospectively reviewed 154 consecutive patients undergoing RSA between July 2015 and July 2017 by one single-fellowship trained surgeon (AJ). Two raters (KAM and MVS) independently measured glenoid inclination in preoperative and minimum two year follow-up radiographs (anteroposterior/Grashey) using the RSA angle. Inclination was then compared to patient-reported outcomes, range of motion (ROM), and independently assessed degree of scapular notching and staging of heterotopic ossification at two year follow-up. Results Median postoperative inclination for each group was found to be -3.6° (interquartile range (IQR) -2.1 to -6.9) and 6.0° (3.2° to 10.1°) for the neutrally/inferiorly and superiorly inclined cohorts, respectively. Preoperative inclination was highly associated with postoperative inclination (p = 0.004). When comparing superiorly and neutrally/inferiorly inclined glenospheres, there were no differences in heterotopic ossification (p = 0.606), scapular notching (p = 0.367), American Shoulder and Elbow Surgeons score (p = 0.419), Single Assessment Numeric Evaluation (p = 0.417), Visual Analogue Scale (VAS) pain score (p = 0.290), forward elevation (p = 0.161), external rotation (p = 0.537), or internal rotation (p = 0.656). Conclusion Compared to neutral and inferior inclination, up to 6° ± 3° of superior glenoid baseplate inclination on a lateralized RSA design produces no differences in postoperative ROM or patient-reported outcomes, and produces similar levels of scapular notching and heterotopic ossification. Additionally, the degree of preoperative inclination represents an important factor in surgical decision-making as it is strongly associated with postoperative inclination. It is important to note that the findings of this study are only reflective of lateralized RSA prostheses. Cite this article: Bone Joint J 2021;103-B(2):360–365.

scholarly journals A “Floating Glenoid” after a Reverse Total Shoulder Arthroplasty: A Case Report with Literature Review

2021 ◽  
pp. 1-7
Author(s):  
Simon N Bell ◽  
Simon N Bell ◽  
Maxim U.S.I. Christmas ◽  
Jennifer A. Coghlan
Keyword(s):  
Rotator Cuff ◽  
Shoulder Arthroplasty ◽  
Total Shoulder Arthroplasty ◽  
Deltoid Muscle ◽  
Reverse Total Shoulder Arthroplasty ◽  
Rotator Cuff Tears ◽  
Surgical Removal ◽  
Joint Movement ◽  
Complex Proximal Humeral Fractures ◽  
Reverse Total Shoulder

A shoulder replacement for cuff tear arthropathy was the original indication of the reverse total shoulder arthroplasty (rTSA). However, over time, this particular concept of shoulder arthroplasty has found new indications for other pathologies such as complex proximal humeral fractures and irreparable rotator cuff tears with rotator cuff arthropathy. Retensioning of the deltoid muscle is a vital step during this procedure in order to restore active elevation however, this can be potentially problematic since it results in anatomical changes and often times increases the stress forces across the acromion. We experienced a rare case of an 84-year-old female presenting with an extensive fracture resulting in a “floating glenoid” after reverse total shoulder arthroplasty via a deltopectoral approach. In our case, the patient presented with gradual onset pain in the posterior shoulder with point tenderness over the acromion, which worsened during active joint movement. The patient was definitively managed with surgical removal of the glenoid implants and conversion to a hemiarthroplasty. While there are existing strategies for preventing fractures of this nature, further research is still necessary to establish best management guidelines of these fracture complications associated with rTSA in order to achieve optimal outcomes.

Sign in / Sign up

Export Citation Format

Share Document