Relationship between cup position and neck type in the TOUCH ® trapeziometacarpal prosthesis: a CAD simulation and cadaver study

Key Points

• This research examines how cup position affects neck type selection in trapeziometacarpal prostheses.
• Conducted a CAD simulation to analyze cup angulation effects.
• Performed a cadaver study to observe neck type impact on impingement risk.
• Evaluated various cup tilt angles and their optimal neck alignments.
• Cup placement parallel to the posteroanterior tilt (PAST) minimizes impingement risk.
• Tilting the cup 15° or more anteriorly necessitates using a straight neck to prevent impingement.

Abstract