In a hand orthosis, what function does the C-Bar serve?

The C-Bar in a hand orthosis primarily serves as a thumb adduction stop, which is crucial for maintaining the functional position of the thumb. This component of the orthosis helps to separate the thumb from the index finger, preventing unwanted movement that could lead to thumb adduction during grasping or pinching activities. By restricting adduction, the C-Bar ensures that the thumb is positioned properly to assist in gripping and functional hand movements, thereby enhancing the stability and effectiveness of the orthosis.

In comparison, wrist support is mainly concerned with stabilizing the wrist joint and does not specifically address the position of the thumb. Similarly, finger extension aids focus on assisting the fingers in achieving extension, which is unrelated to the specific function of the C-Bar. Palmar support, while important for hand stability and comfort, also does not perform the same role as the C-Bar in preventing thumb adduction. Thus, the primary function of the C-Bar is integral to promoting optimal hand function by maintaining the thumb's necessary position.