Authors: Carlo Felice De Biase Giovanni Ziveri Marco Delcogliano Francesca de Caro Stefano Gumina Mario Borroni Alessandro Castagna Roberto Postacchini
Publish Date: 2013/06/09
Volume: 37, Issue: 10, Pages: 1949-1955
Abstract
The current models of reverse shoulder arthroplasty RSA expose the procedure to the risk of scapular notching possibly leading to loosening of the glenoid We compared the clinical and radiographic results obtained with a concentric or eccentric glenosphere to assess whether the eccentric design might give better clinical results and avoid or decrease the risk of scapular notchingOf our patients 31 underwent RSA using a concentric glenosphere group A while 29 had an eccentric glenosphere group B Postoperatively patients were followedup at one to 12 months and annually thereafter with the mean being 33 months in group A and 275 in group B In both groups the minimum follow up FU was 24 months Preoperatively and at each FU starting from six months patients were assessed using the Constant score On radiographs prosthesis scapular neck angle PSNA distance between scapular neck and glenosphere DBSNG and pegglenoid rim distance PGRD were calculated The severity of notching was classified in four gradesIn group A the mean Constant score increased by 30 points compared to the preoperative score and the active ROM increased considerably At latest FU the mean PSNA DBSNG and PGRD were respectively 87° 34 mm and 198 mm Glenoid notching was present in 42 of cases In group A the mean Constant score increased by 34 points and the mean ROM was better than in group A The average PSNA PGRD and DBSNG were respectively 92° 212 mm and 43 mm Radiographs showed no inferior scapular notching
Keywords: