Advertisement for orthosearch.org.uk
Orthopaedic Proceedings Logo

Receive monthly Table of Contents alerts from Orthopaedic Proceedings

Comprehensive article alerts can be set up and managed through your account settings

View my account settings

Visit Orthopaedic Proceedings at:

Loading...

Loading...

Full Access

COMPUTERISED TOMOGRAPHY STUDY OF THE IMPLANTATION OF THE GLENOID COMPONENT IN INVERTED PROSTHESES



Abstract

Introduction: Analysis of location of central peg and the fours screws of the glenoid component in inverted shoulder prostheses.

Materials and methods: 34 inverted prostheses. Mean age 74.10. 33 women, 1 man. Preoperative CT: glenoid version, presence and size of bone spurs. Postoperative CT: location of central peg and 4 screws.

Results: 27 retroverted glenoids (mean 6.5°), 7 anteverted glenoids (mean 5.3°); anterior bone spur in 17 cases, posterior in 12. In 52% of the cases the central peg was inside the glenoid; in 33% the anterior part was outside and in 14% the posterior part. If the anterior part of the central peg was outside, 85% was due to retroverted glenoids (mean 8.33°). If the posterior part was outside, 66% of these were due to anteverted glenoids (mean 9.5°). Lower inside screw in the scapula in 38% of cases, 3/4 inside in 19%, 2/4 in 23% and 1/4 in 19%. Upper screw: 47%, 23% 19% and 9%, respectively. Anterior screw: 66%, 23% and 9%, respectively. Posterior screw: 38%, 42%, 14% and 4%, respectively.

Conclusions:

  • - Lower screw completely within the lateral part of the scapula with less coverage by upper screw.

  • - Anterior extrusion of the central peg correlated with more retroverted glenoids and posterior extrusion with very anteverted glenoids.

  • - No correlation between presence of anterior and posterior bone spurs and the position of the peg or the screws.

The abstracts were prepared by Dr. E. Carlos Rodríguez-Merchán, Editor-in-Chief, Spanish Journal of Orthopaedics and Traumatology (Revista de Ortopedia y Traumatología). Correspondence should be addressed to him at: Sociedad Española de Cirugía Ortopédica y Traumatología (SECOT), Calle Fernández de los Ríos 108, 28015-Madrid, Spain