Comparing conventional and computer-assisted surgery baseplate and screw placement in reverse shoulder arthroplasty

Gabriel Venne; Brian J Rasquinha; David Pichora; Randy E Ellis; Ryan Bicknell

doi:10.1016/j.jse.2014.10.012

Comparing conventional and computer-assisted surgery baseplate and screw placement in reverse shoulder arthroplasty

J Shoulder Elbow Surg. 2015 Jul;24(7):1112-9. doi: 10.1016/j.jse.2014.10.012. Epub 2015 Jan 1.

Authors

Gabriel Venne¹, Brian J Rasquinha², David Pichora³, Randy E Ellis⁴, Ryan Bicknell⁵

Affiliations

¹ Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada. Electronic address: 0gv@queensu.ca.
² Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada.
³ Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada; Department of Surgery, Queen's University, Kingston, ON, Canada; Kingston General Hospital, Kingston, ON, Canada.
⁴ Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada; Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada; Department of Surgery, Queen's University, Kingston, ON, Canada; Kingston General Hospital, Kingston, ON, Canada; School of Computing, Queen's University, Kingston, ON, Canada.
⁵ Department of Surgery, Queen's University, Kingston, ON, Canada; Kingston General Hospital, Kingston, ON, Canada.

PMID: 25556807
DOI: 10.1016/j.jse.2014.10.012

Abstract

Background: Preoperative planning and intraoperative navigation technologies have each been shown separately to be beneficial for optimizing screw and baseplate positioning in reverse shoulder arthroplasty (RSA) but to date have not been combined. This study describes development of a system for performing computer-assisted RSA glenoid baseplate and screw placement, including preoperative planning, intraoperative navigation, and postoperative evaluation, and compares this system with a conventional approach.

Materials and methods: We used a custom-designed system allowing computed tomography (CT)-based preoperative planning, intraoperative navigation, and postoperative evaluation. Five orthopedic surgeons defined common preoperative plans on 3-dimensional CT reconstructed cadaveric shoulders. Each surgeon performed 3 computer-assisted and 3 conventional simulated procedures. The 3-dimensional CT reconstructed postoperative units were digitally matched to the preoperative model for evaluation of entry points, end points, and angulations of screws and baseplate. Values were used to find accuracy and precision of the 2 groups with respect to the defined placement. Statistical analysis was performed by t tests (α = .05).

Results: Comparison of the groups revealed no difference in accuracy or precision of screws or baseplate entry points (P > .05). Accuracy and precision were improved with use of navigation for end points and angulations of 3 screws (P < .05). Accuracy of the inferior screw showed a trend of improvement with navigation (P > .05). Navigated baseplate end point precision was improved (P < .05), with a trend toward improved accuracy (P > .05).

Conclusion: We conclude that CT-based preoperative planning and intraoperative navigation allow improved accuracy and precision for screw placement and precision for baseplate positioning with respect to a predefined placement compared with conventional techniques in RSA.

Keywords: Computer-assisted surgery; reverse shoulder arthroplasty.

Publication types

Comparative Study

MeSH terms

Arthroplasty, Replacement / methods*
Bone Plates
Bone Screws
Cadaver
Humans
Imaging, Three-Dimensional
Scapula / surgery
Shoulder Joint / surgery*
Surgery, Computer-Assisted*
Tomography, X-Ray Computed / methods