Shoulderblades are a form of transport similar to a suspended monorail or inverted rollercoaster, except perhaps more bicycle or bum-jiggler-esque.
The basic thrust is provided by rotation of the shoulders - while one shoulder goes up and forwards, the other goes down and backwards - like pedaling.
The shoulderblades hook up to a specialised rail, supported from above by bracets, which are themselves supported by steel tubular bells. The actual shoulderblades themselves are worn over the back and front like a backpack on both sides. The rider's shoulders slip into metal covers which have spokes connected to a central axis. The axis rotation caused by the 'shoulder pedaling' moments a chain like a cycle does.
Connecting the shoulderblades to the rail is a fairly simple matter. A wheel at the other end of the chain is underneath the rail. Connectors join this wheel to another wheel above the track on both sides. This means that shoulderblades cannot fall off - something actually has to break, unless you can squirm out of the harness.
Because momentum is driven by the shoulders, which are not at the 'end' of anything', the chain is long and has to be kept away from the head. The harness connects to a helmet which hold the chain behind the rider's head. The space between the chain and the head is buffetted by a pillow allowing for sleep. Note that sleep is not actually possible with the way the shoulders move.
Current technology does not allow for crossroads or overtaking.
That's what shoulderblades are.
Not bad for something fresh from the sleepy mind.
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Without your scapulas you couldn't throw spears or brachiate.
