Document Detail

Scapular notching in reverse shoulder arthroplasties: the influence of glenometaphyseal angle.
MedLine Citation:
PMID:  21820377     Owner:  NLM     Status:  MEDLINE    
PATIENT AND METHODS: This is a retrospective study of a continuous series of 85 reverse shoulder arthroplasties; 62 of these fulfilled inclusion criteria. The following parameters were studied: body mass index (BMI), inferior overhang of the glenosphere, the angles showing the position of the glenoid (GH) and the humerus (MH) in the scapular plane as well as the glenometaphyseal angle (GM=MH-GH), during an initial postoperative follow-up, at 1 and 2 years, and at a final follow up of a mean 45 months (24-81). The parameters studied were compared in two groups with and without scapular notching.
RESULTS: There were 21 instances of notching at the final follow-up. This rate was significantly correlated to the BMI, which was a mean 27.2 in patients without a notch and 22.6 in patients with a notch, while the preoperative inclination of the glenoid in these groups was respectively 92.3° versus 85° respectively, the inferior overhang of the glenosphere was 4mm versus 2.8mm, the GM angle was 36° versus 47°, the MH angle at one year of follow-up was 135° versus 145° and the GH angle at the final follow-up was 103° versus 94° respectively. The BMI was significantly correlated to the GM angle, and a low BMI was associated with high values of this angle.
DISCUSSION: The relative position of the glenoid and humeral components, as shown by the GM angle, was an essential factor in the development of a scapular notching. The humeral component of the GM angle evolved in thin patients with progressive adduction of the arm, which is associated with a risk of notching. This should be taken into account when performing reverse shoulder arthroplasties.
LEVEL OF EVIDENCE: Level IV retrospective study.
V Falaise; C Levigne; L Favard;
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Publication Detail:
Type:  Journal Article     Date:  2011-08-04
Journal Detail:
Title:  Orthopaedics & traumatology, surgery & research : OTSR     Volume:  97     ISSN:  1877-0568     ISO Abbreviation:  Orthop Traumatol Surg Res     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-09-29     Completed Date:  2012-01-26     Revised Date:  2013-10-31    
Medline Journal Info:
Nlm Unique ID:  101494830     Medline TA:  Orthop Traumatol Surg Res     Country:  France    
Other Details:
Languages:  eng     Pagination:  S131-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Masson SAS. All rights reserved.
Orthopaedic service 1, CHU Trousseau, university F.-Rabelais, 2 bis, boulevard Tonnellé, 37000 Tours, France.
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MeSH Terms
Aged, 80 and over
Arthroplasty, Replacement / adverse effects,  methods*
Body Mass Index
Glenoid Cavity / anatomy & histology*
Humerus / anatomy & histology
Middle Aged
Postoperative Complications / prevention & control
Retrospective Studies
Shoulder Joint / radiography,  surgery*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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