New orthopedic acquisition for the Clinic (Patreon)

We did manage to put our hands on few of those 'orthopedic splints', but I'm not sure how and for what use them. Anyone by chance have seen something like this before and know it's purpose and way to properly use?

I think that this is how it should be assemblend:

Here goes the foot obviously and it can be tied up to that insole


There is a handle and a string which can pull the insole.

One of the 'crutches' extend far longer than the other one. I think that one goes up to the crotch and second one up to the armpit - then they are tied up to the patient using the straps.
Is it for setting broken bones? Or for applying traction?