Ultrasound on Shoulder Prosthesis

2022 ◽  
pp. 71-74
Author(s):  
F. Dordain
Keyword(s):  
Shoulder Prosthesis

Assessment of glenoid baseplate initial micromotion and fixation strength in reverse total shoulder arthroplasty designs using a direct shear force methodology

2021 ◽  
pp. 175857322110329
Author(s):  
Therese E Parr ◽  
Jennifer K Anderson ◽  
Alan M. Marionneaux ◽  
John M Tokish ◽  
Stefan J Tolan ◽  
...  
Keyword(s):  
Shoulder Arthroplasty ◽  
Shear Force ◽  
Total Shoulder Arthroplasty ◽  
Reverse Total Shoulder Arthroplasty ◽  
Fixation Strength ◽  
Shoulder Prosthesis ◽  
Direct Shear ◽  
Device Failure ◽  
Glenoid Baseplate ◽  
Reverse Total Shoulder

Background In a reverse total shoulder arthroplasty, the altered glenohumeral joint center of rotation subjects the glenoid baseplate to increased shear forces and potential loosening. Methods This study examined glenoid baseplate micromotion and initial fixation strength with the application of direct shear force in a Sawbone model. The reverse total shoulder arthroplasty systems examined were the DJO Reverse® Shoulder Prosthesis, the Exactech Equinoxe® Reverse System, and the Tornier AequalisTM Reverse Shoulder Prosthesis. Specimens were cyclically tested with increasing shear loads until 150 µm of displacement between the implant and glenoid was achieved, and subsequently until failure, classified as either 1 cm of implant/glenoid displacement or fracture. Results The average load withstood for the 150 µm threshold for DJO, Tornier, and Exactech was 460 ± 88 N, 525 ± 100 N, and 585 ± 160 N, respectively. The average total load at device failure for DJO, Tornier, and Exactech was 980 ± 260 N, 1260 ± 120 N, and 1350 ± 230 N, respectively. Discussion The Exactech implant design trended toward requiring more load to induce micromotion at each threshold and to induce device failure, most commonly seen as inferior screw pull out. This study proposes design features that may enhance fixation and suggests little risk of initial micromotion or failure during initial post-operative recovery.

scholarly journals Mid-term results with an anatomic stemless shoulder prosthesis in patients with primary osteoarthritis

2019 ◽  
Vol 53 (3) ◽  
pp. 170-174 ◽  
Author(s):  
Matthias Bülhoff ◽  
David Spranz ◽  
Michael Maier ◽  
Patric Raiss ◽  
Thomas Bruckner ◽  
...  
Keyword(s):  
Shoulder Prosthesis ◽  
Primary Osteoarthritis ◽  
Mid Term Results ◽  
Stemless Shoulder Prosthesis

Successful bony integration of a porous tantalum implant despite longlasting and ongoing infection: Histologic workup of an explanted shoulder prosthesis

2018 ◽  
Vol 106 (8) ◽  
pp. 2924-2931 ◽  
Author(s):  
Peter Wahl ◽  
Christoph M. Sprecher ◽  
Christian Brüning ◽  
Christoph Meier ◽  
Stefan Milz ◽  
...  
Keyword(s):  
Shoulder Prosthesis ◽  
Porous Tantalum ◽  
Ongoing Infection

scholarly journals The use of partial prosthesis in shoulder surgery

2016 ◽  
Vol 69 (suppl. 1) ◽  
pp. 47-51
Author(s):  
Srdjan Ninkovic ◽  
Sladjana Radosavljevic ◽  
Vladimir Harhaji ◽  
Ivica Lalic ◽  
Natasa Janjic ◽  
...  
Keyword(s):  
Orthopedic Surgery ◽  
Daily Living ◽  
Articular Surface ◽  
Functional Results ◽  
Risk Groups ◽  
Daily Activities ◽  
Shoulder Prosthesis ◽  
Clinical Center ◽  
Novi Sad ◽  
Shoulder Score

Introduction. Indications for the use of partial shoulder prosthesis are dislocated four-part fractures and multi-part and four-part fractures-dislocations, impressive fractures of the humeral head (including involvement of more than 40% of the articular surface) and ?head splitting? fractures of humerus. The aim of this study was to present the results of the application of partial shoulder prosthesis at the Department of Orthopedic Surgery and Traumatology, Clinical Center of Vojvodina in Novi Sad and identify risk groups among the participants. Material and Methods. The study, which was retrospective, included 22 patients who had undergone the partial shoulder arthroplasty in the period from 2005 to 2015 at the Department of Orthopedic Surgery and Traumatology, Clinical Center of Vojvodina. The functional results were evaluated on the basis of the Constant Shoulder Score. Results. The study sample consisted of 15 women and 7 men, whose mean age was 64.9 ? 9.1 years. The average time from the injury to surgery was 13.3 days. According to the Constant scoring scale, the result was excellent in 6 (27%) patients, good in 3 (14%), fair in 7 (32%), and poor in 6 (27%) participants. 75% of participants said they were satisfied with the results of the operation. Conclusion. Partial shoulder prosthesis gives good functional results and allows resumption of activities of daily living. Better results were obtained within the subjective segments (pain, daily activities, vitality), which points out a greater subjective patient?s satisfaction in relation to the measured functio?nal outcome.

scholarly journals Six-Year Experience with the Delta III Reverse Shoulder Prosthesis

2009 ◽  
Vol 17 (2) ◽  
pp. 151-156 ◽  
Author(s):  
Federico Alberto Grassi ◽  
Luigi Murena ◽  
Federico Valli ◽  
Riccardo Alberio
Keyword(s):  
Glenohumeral Joint ◽  
Functional Results ◽  
Shoulder Prosthesis ◽  
Glenoid Component ◽  
Main Concern ◽  
Massive Rotator Cuff Tear ◽  
Term Survival ◽  
Scapular Notching ◽  
Reverse Prosthesis ◽  
Humeral Component

Purpose. To report the clinical and radiographic results and complications of the Delta III reverse prosthesis. Methods. 24 women and 2 men aged 62 to 84 (mean, 75) years underwent total shoulder replacement using the Delta III reverse prosthesis. Patient diagnoses were massive rotator cuff tear (n=20), disabling sequelae of proximal humeral fractures (n=3), and failure of an unconstrained arthroplasty (n=3). Clinical and functional results were assessed using the Constant scale. Active range of motion (ROM) was measured. Scapular notching and radiolucent lines around the humeral component were evaluated using radiographs. Patient satisfaction of the treatment was evaluated by a direct interview. Results. 23 patients were followed up for 26 to 84 (mean, 42) months. Two patients had loosening of the glenoid component (at 6 months and 5 years) and underwent revision surgery. There were no instances of infection, instability, or acromial fracture. Only active elevation improved significantly after surgery, as did both the absolute and adjusted Constant scores. 12 patients were completely pain-free, 9 complained of slight pain, and one of moderate pain. The severity of scapular notching progressed with time. 15 patients were satisfied with the treatment, 6 were partially satisfied, and 2 were not satisfied. Conclusion. The Delta III prosthesis restores shoulder function but has biomechanical limits. Its use should be limited to elderly patients with severe impairment of the glenohumeral joint. Scapular notching is a main concern for the long-term survival of the implant.

Computational reverse shoulder prosthesis model: Experimental data and verification

2015 ◽  
Vol 48 (12) ◽  
pp. 3242-3251 ◽  
Author(s):  
A. Martins ◽  
C. Quental ◽  
J. Folgado ◽  
J. Ambrósio ◽  
J. Monteiro ◽  
...  
Keyword(s):  
Experimental Data ◽  
Shoulder Prosthesis ◽  
Reverse Shoulder Prosthesis

THE TRISPHERICAL TOTAL SHOULDER PROSTHESIS

1980 ◽  
pp. 259-263
Author(s):  
Anthony G. Gristina
Keyword(s):  
Shoulder Prosthesis
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