Final answer:
Percutaneous reduction and screw fixation is used for calcaneus fractures that are not significantly displaced or can be realigned without open surgery. It is a closed reduction technique ideal for less complex fractures.
Step-by-step explanation:
The type of calcaneus fracture that is typically treated with percutaneous reduction and screw fixation is one where the bone fragments have not been significantly displaced or the fracture is moderately displaced but can be realigned without the need for a full open surgery. This is a form of closed reduction, where the bone is manipulated back into place without surgically exposing the fracture. Percutaneous screw fixation is then used to hold the bone fragments in place, promoting proper healing and stability. This approach is usually reserved for fractures that are less complex and can be adequately realigned through less invasive methods.