Conform and non conform glenoid components in total shoulder replacements.

In this project we will determine the effect of conform and non-conform glenohumeral components in shoulder arthroplasty on glenohumeral fixation and functional outcome. We believe that conform components are beneficial for motion coordination and reducing high rim-loads, while non-conform components are beneficial in reducing high humerus–to–scapula impulses (impact forces).
Glenoid fixation will be determined by means of Röntgen Stereophotogrammetry Analysis (RSA). Functional outcome will be determined by means of RoM, VAS, MVC and Constant Scores. Patients’ level of activity will be determined by means of the Shoulder Rating Questionnaire.
In order to understand the clinical and functional outcome, fluoroscopy will be applied to determine the humerus-to-scapula contact area (i.e. direction of loading of the glenoid component), EMG will be used to determine the Principal Action of the recorded shoulder muscles (measure for coordination and co-contraction), and a shoulder model will be used to simulate the observed conditions in order to predict the effect on muscle forces and consequently, on the loading of the implant components.

Conform components are beneficial for motion coordination and reducing high rim-loads, while non-conform components are beneficial in reducing high humerus–to–scapula impulses (impact forces).

Total shoulder replacement