**Core Concept**
Continuous fixed traction is a type of orthopedic treatment used to immobilize and align a fractured bone or joint. It involves the application of a constant, unchanging force to the affected area to promote healing and prevent further injury.

**Why the Correct Answer is Right**
Continuous fixed traction is provided by a device called a Thomas splint, which is a type of traction splint that consists of a metal frame with a padded bar that fits around the leg or arm. This device applies a continuous, fixed force to the affected area, keeping the bone or joint in a stable position and promoting healing. The Thomas splint works by distributing the force evenly around the affected area, reducing pain and discomfort.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a device or method of providing continuous fixed traction.
**Option B:** This option is incorrect because it is a type of dynamic traction, which involves the use of weights or pulleys to apply a variable force to the affected area.
**Option C:** This option is incorrect because it is a type of orthotic device used to support and stabilize joints, but it is not designed to provide continuous fixed traction.

**Clinical Pearl / High-Yield Fact**
When using a Thomas splint, it is essential to ensure that the device is properly fitted and adjusted to avoid putting too much pressure on the affected area, which can lead to nerve damage or compartment syndrome.

**Correct Answer: C. Thomas splint**