Which type of fracture features a tortion force where one end of the bone is fixed?

The type of fracture that features a torsion force with one end of the bone fixed is the spiral fracture. This occurs when a rotational or twisting force is applied to the bone, causing it to break in a spiral manner. The fixed point allows the other end of the bone to experience a rotational force, leading to the characteristic spiral pattern of the fracture.

In contrast, a comminuted fracture consists of the bone being broken into multiple pieces, and it does not specifically involve torsion. An oblique fracture occurs at an angle across the bone but is not specifically defined by a torsion force; it more typically results from bending. A transverse fracture is a straight line break that occurs perpendicular to the long axis of the bone, which is not associated with torsional forces or movement around a fixed point.