INTRODUCTION A computer model quantified and compared muscle lengths and moment arms of two different reverse shoulder arthroplasty humeral tray designs during two different motions. METHODS The computer model simulated internal/ external rotation and abduction in the scapular plane for the normal shoulder, the 38 mm non-offset, and the 38 mm posterior-superior offset reverse shoulders. Muscl...

ont matter & 2006 006.10.004 thor. [email protected] Summary The treatment of combined glenohumeral arthritis and massive rotator cuff deficiency remains a unique challenge. Prosthetic reconstruction is aimed at restoring the normal kinematics of the glenohumeral joint. The reverse shoulder prosthesis medialises the centre of rotation of the glenohumeral joint, thereby lengthening the deltoid lev...

Glenoid replacement is technically challenging. Removal of a cemented glenoid component often results in a large osseous defect which makes the immediate introduction of a revision prosthesis almost impossible. We describe a two-stage revision procedure using a reversed shoulder prosthesis. Freeze-dried allograft with platelet-derived growth factor was used to fill the glenoid defect. Radiologi...

PURPOSE The purpose of this study is to analyze the morphology of the scapula with reference to the glenoid component implantation in reversed shoulder prosthesis, in order to improve primary fixation of the component. METHODS Seventy-three 3-dimensional computed tomography of the scapula and 108 scapular dry specimens were analyzed to determine the anterior and posterior length of the glenoi...

The aim of the present study was to develop a method for three-dimensional (3D) reconstruction of the brachial plexus to study its morphology and to calculate strain and displacement in relation to changed nerve position. The brachial plexus was finely dissected and injected with contrast medium and leaden markers were implanted into the nerves at predefined places. A reverse shoulder prosthesi...

Stemless shoulder arthroplasty with metaphyseal fixation of the humeral component is increasingly used in the treatment of primary or secondary osteoarthritis, achieving significant pain relief and improving both range of motion and patient satisfaction [1, 4, 6]. The majoradvantagesof the stemlesshumeral design are preservation of humeral bone stock, anatomical reconstruction regardless of hum...

Mining information from EMG signals to detect complex motion intention has attracted growing research attention, especially for upper-limb prosthetic hand applications. In most of the studies, recordings of forearm muscle activities were used as the signal sources, from which the intention of wrist and hand motions were detected using pattern recognition technology. However, most daily-life upp...

We reviewed 80 shoulders (77 patients) at a mean follow-up of 44 months after insertion of a Grammont inverted shoulder prosthesis. Three implants had failed and had been revised. The mean Constant score had increased from 22.6 points pre-operatively to 65.6 points at review. In 96% of these shoulders there was no or only minimal pain. The mean active forward elevation increased from 73 degrees...

BACKGROUND It has been suggested that limited active ROM of reverse shoulder prostheses relates to lack of strength. However, the postoperative strength has not been quantified. QUESTIONS/PURPOSES We therefore measured joint torques in patients with reverse shoulder prostheses and correlated torques with functional scores. METHODS We recruited 33 patients (age, 72 ± 8 years) with a reverse ...

The purpose of the study was to assess the subjective outcome and five-year survival of non-cemented total joint replacement of the trapeziometacarpal joint with the Arpe prothesis. Forty-nine hands were operated on. Outcome scores were obtained with a mean follow-up of 6 years (range: 3-11 years) for 35 prostheses. Mean disability of the arm, shoulder and hand (DASH) score was 8, mean visual a...