Determination of humeral inclination in stemless shoulder arthroplasty using plain radiographs.
Humeral inclination
humeral neck shaft angle
reverse shoulder arthroplasty
stemless
total shoulder arthroplasty
Journal
Orthopedic reviews
ISSN: 2035-8237
Titre abrégé: Orthop Rev (Pavia)
Pays: United States
ID NLM: 101524779
Informations de publication
Date de publication:
02 Dec 2019
02 Dec 2019
Historique:
received:
05
06
2019
accepted:
19
08
2019
entrez:
4
1
2020
pubmed:
4
1
2020
medline:
4
1
2020
Statut:
epublish
Résumé
Plain radiographs of the shoulder are routinely used to assess implant orientation after shoulder arthroplasty. Recently, humeral inclination has come into focus especially in reverse stemless shoulder arthroplasty. But, in X-ray projections not exactly parallel to the base of the humeral component, the humeral inclination angle cannot be determined precisely. Therefore, we established a mathematical algorithm to calculate the humeral neck shaft angle and counterchecked the formula using plain radiographs of a sawbone model containing a humeral head prosthesis. With increasing angles of retroversion, the base of the humeral component forms an ellipse in plain radiographs. Knowing the width and length of the ellipse as well as the inclination angle in a plain radiograph, the exact inclination angle can be determined using the equation reported below. Thus, independent from the viewing angle or angle of retroversion, the inclination angle of a stemless humeral head implant can be estimated with an accuracy of ±1.5-degree deviation. The algorithm proposed may be the basis for further research on the impact of humeral inclination in stemless shoulder arthroplasty.
Identifiants
pubmed: 31897278
doi: 10.4081/or.2019.8194
pmc: PMC6912136
doi:
Types de publication
Journal Article
Langues
eng
Pagination
8194Informations de copyright
©Copyright: the Author(s), 2019.
Déclaration de conflit d'intérêts
Conflict of interest: the authors declare no potential conflict of interest.
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