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How a reverse shoulder cheats physics — an interactive explainer
Why putting the ball where the socket was lets a torn-cuff shoulder lift again. Toggle the geometry and watch the deltoid's moment arm grow.
Glenoid version, in your hands
Why a few degrees of retroversion matters — with a baseplate you can tilt yourself. Drag the sliders and watch the failure risk climb the curve.
What live navigation actually changes in shoulder replacement
Navigation for glenoid baseplate fixation is usually sold as precision for its own sake. The real value is what it does to your worst cases.
The rotator cuff is a set of guy-ropes, and that explains a lot
Why a torn shoulder still lifts the arm sometimes, and refuses other times. It is levers and angles, not magic. Drag the line of pull and find out.